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prof. RNDr. Pavel Kubeš, CSc.

Všechny publikace

Dynamics of implosion phase of modified plasma focus studied via laser interferometry and electrical measurements

  • DOI: 10.1063/5.0098124
  • Odkaz: https://doi.org/10.1063/5.0098124
  • Pracoviště: Katedra fyziky
  • Anotace:
    Dynamics of the implosion of the dense plasma focus play an essential role in converting electrical energy into the kinetic energy of the current sheath and subsequent production of accelerated electrons, ions, hard X-ray, and neutron emission. This paper presents the analysis of the implosion parameters, such as the implosion velocity and imploding mass, coupled with electrical parameters observed on the PF-1000 facility with a modified electrode system. The first two parameters are based on the 16-frame Mach–Zehnder interferometer, which provides the spatial distribution of electron density in a time sequence. Measurement of the total current, current derivative, and voltage enables us to evaluate the total inductance and kinetic energy driven by the capacitor bank. Then comparing the inductances and kinetic energies evaluated from the interferograms and electrical waveforms can provide more precise information on the current flowing in the imploding sheath. We present a possible way to deal with the fact that only part of the total current flows through the imploding layer. With the supposition that the rest of the current flows close to the insulator, we conclude that roughly 70% of the total current flows through the pinch, which is in good agreement with an input parameter of the Lee model, for example.

Temporal behavior of hard x-ray and neutron production in plasma focus discharges

  • DOI: 10.1063/5.0085351
  • Odkaz: https://doi.org/10.1063/5.0085351
  • Pracoviště: Katedra fyziky
  • Anotace:
    This paper concerns the correlation of hard x-ray and neutron signals, which were recorded with scintillation detectors oriented in the axial and radial directions, in a comparison with interferometric and extreme-ultraviolet radiation frames, as recorded within the plasma focus (PF)-1000 facility operated with a deuterium filling. The considered signals showed two different phases. In the initial phase, the fusion neutrons are mainly produced by deuterons moving dominantly downstream during the disruption of a pinch constriction (lasting tens nanoseconds). In the later phase (usually after about 100 ns), the fusion neutron emission reaches its maximum in the radial directions. This emission (lasting 100–200 ns) is caused by the fast deuterons moving in both the downstream and radial directions. It correlates usually with a decay of dense plasma structures in remnants of the expanding pinch column. This can be explained by a decay of internal magnetic fields. The neutron signal is usually composed of several sub-pulses of different energies. It was deduced that the primary deuterons producing the observed fusion neutrons undergo a regular and repeated temporal, directional, and energy evolution.

Characteristics of fast deuteron sources generated in a dense plasma focus

  • DOI: 10.1140/epjp/s13360-021-01799-w
  • Odkaz: https://doi.org/10.1140/epjp/s13360-021-01799-w
  • Pracoviště: Katedra fyziky
  • Anotace:
    The paper characterizes sources of the fast deuterons which can produce the D–D fusion neutrons. Two pinhole cameras, the axial one and the slant one (oriented at 0° and 60° in relation to the z-axis), were equipped with solid-state nuclear track detectors and applied to investigate the fast deuterons of energies about 100 keV, which produce small quasi-circular track spots of diameters ranging (1–3) mm. They are often observed in plasma-focus shots with higher neutron yields, when they constitute a part of the recorded ion images in a form of azimuthal arcs and/or radial strips. An analysis of an influence of the global magnetic field, which acts along the fast deuteron trajectories, made it possible to determinate the deuteron sources localization, also outside the dense plasma column. The recorded spatial distribution of the fast deuterons, their temporal correlation with disruptions of the ordered plasma structures inside and outside the pinch column, and a regular evolution of the energy of fast deuterons—indicate their strong interconnection and the link with filamentary structure of the current flow.

Comparison of measured and computed neutron yield from PF1000 plasma focus device operated with deuterium gas

  • Autoři: Akel, M., prof. RNDr. Pavel Kubeš, CSc., Paduch, M., Lee, S.
  • Publikace: Radiation Physics and Chemistry. 2021, 188 ISSN 1879-0895.
  • Rok: 2021
  • DOI: 10.1016/j.radphyschem.2021.109633
  • Odkaz: https://doi.org/10.1016/j.radphyschem.2021.109633
  • Pracoviště: Katedra fyziky
  • Anotace:
    The measured current wave shapes of PF1000 plasma focus discharged at 16 kV in deuterium in the pressure range 1.05 – 1.2 Torr are fitted to the computed current wave shapes using the Lee model code. Very good fit is achieved which suggests that the code is configured very well for the PF1000 for these shots. This is borne out by the computed neutron yield arising from each shot agreeing well with the measured yield. The computed average yield of 8 shots at 1.05 Torr is 1.78 × 109neutrons per shot compared to the measured average yield of 1.75 × 109 differing by less than 2% although one of the lowest yield shots showed a difference of 10% between the computed and measured yields. The computed average yield of 16 shots at 1.2 Torr is 2.33 × 109 compared to the measured average of 2.29 × 109 differing also by less than 2% although the lowest yield shot showed a difference of 70%. The conclusion is that the neutron production of the PF1000 is well estimated by the Lee Code simply by fitting the computed current wave shape to the measured current wave shape.

K-shell radiation and neutron emission from z-pinch plasmas generated by hybrid gas-puff implosions onto on-axis wires

  • DOI: 10.1063/5.0054683
  • Odkaz: https://doi.org/10.1063/5.0054683
  • Pracoviště: Katedra fyziky
  • Anotace:
    Z-pinches have been explored as efficient soft x-ray sources for many years. To optimize x-ray emission, various z-pinch configurations were tested. This paper presents data obtained with a hybrid gas-puff z-pinch imploding onto on-axis wires on a microsecond, multi-megaampere GIT-12 generator. In our previous experiments, the hybrid gas puff, i.e., an inner deuterium gas puff surrounded by an outer hollow cylindrical plasma shell, was used to produce energetic protons, deuterons, and neutrons up to 60MeV [Klir et al., New J. Phys. 22, 103036 (2020)]. The behavior of the hybrid gas-puff z-pinch on GIT-12 was interpreted as a high-density plasma opening switch with a microsecond conduction time, 3 MA conduction current, nanosecond opening, and up to 60MV stand-off voltage. These properties can be employed to transfer the current into an on-axis load with a high rise rate. In the recent experiments on GIT-12, we therefore placed single or multiple aluminum wires on the axis of the hybrid gas-puff z-pinch. Before a current sheath arrived at the axis, a coronal plasma was seen around the wire. A rapid increase in x-ray radiation was observed when the coronal plasma imploded onto the axis. The coronal plasma implosion resulted in a long (2cm), narrow (similar to mm) column radiating in the Al K-shell lines. With the single Al wire of 80 mu m diameter, the K-shell x-ray output reached 5.5 +/- 0.8kJ in a 0.6 +/- 0.1 TW peak power and 7 +/- 1ns pulse. The higher K-shell yield of 12 +/- 2kJ and peak K-shell power of 0.7 +/- 0.1 TW were achieved with four 38 mu m diameter Al wires. (Their cross section formed the corners of a square with 1mm side.) The presence of the wires on the axis significantly suppressed ion acceleration and neutron production. Deuterium-deuterium (DD) neutron yields of about 1.2x10(11) were 20 times smaller than the yields produced in shots without any wire. The DD neutron yield was increased up to 4.5x10(11) when the Al wire was replaced by a fiber fr

Mapping of azimuthal B-fields in Z-pinch plasmas using Z-pinch-driven ion deflectometry

  • DOI: 10.1063/5.0040515
  • Odkaz: https://doi.org/10.1063/5.0040515
  • Pracoviště: Katedra fyziky
  • Anotace:
    B-field measurements are crucial for the study of high-temperature and high-energy-density plasmas. A successful diagnostic method, ion deflectometry (radiography), is commonly employed to measure MGauss magnetic fields in laser-produced plasmas. It is based on the detection of multi-MeV ions, which are deflected in B-fields and measure their path integral. Until now, protons accelerated via laser–target interactions from a point-like source have been utilized for the study of Z-pinch plasmas. In this paper, we present the results of the first Z-pinch-driven ion deflectometry experiments using MeV deuterium beams accelerated within a hybrid gas-puff Z-pinch plasma on the GIT-12 pulse power generator. In our experimental setup, an inserted fiducial deflectometry grid (D-grid) separates the imploding plasma into two regions of the deuteron source and the studied azimuthal B-fields. The D-grid is backlighted by accelerated ions, and its shadow imprinted into the deuteron beams demonstrates ion deflections. In contrast to the employment of the conventional point-like ion source, in our configuration, the ions are emitted from the extensive and divergent source inside the Z-pinch. Instead of having the point ion source, deflected ions are selected via a point projection by a pinhole camera before their detection. Radial distribution of path-integrated B-fields near the axis (within a 15 mm radius) is obtained by analysis of experimental images (deflectograms). Moreover, we present a 2D topological map of local azimuthal B-fields B(r,z) via numerical retrieval of the experimental deflectogram.

Optimizing of Experimental Load of PFZ-200 Plasma Focus

  • DOI: 10.1109/TPS.2020.3041329
  • Odkaz: https://doi.org/10.1109/TPS.2020.3041329
  • Pracoviště: Katedra fyziky
  • Anotace:
    This article presents a study of neutron emission on the PFZ-200 plasma focus at the Department of physics on FEE CTU in Prague, Czech Republic. In order to achieve the highest and most stable neutron yields, the deuterium working gas pressure and the anode shape were systematically varied. We observed the plasma time to the pinch and the discharge current by the Rogowski coil and neutron emission by the silver activation detector and scintillation time-of-flight detectors. The imploded plasma was visualized using a fast X-ray pinhole camera with a gated microchannel plate detector. The experiment presents the z-pinch discharges with the current maximum above 200 kA and the average neutron yields of 3×10^8 neutrons/shot. Measured pinch times were in the range from 1.65 to 1.85 μs . The hollow round anode configuration performed the most stable neutron yields with a deviation under 20%.

Update on the Scientific Status of the Plasma Fo

  • DOI: 10.3390/plasma4030033
  • Odkaz: https://doi.org/10.3390/plasma4030033
  • Pracoviště: Katedra fyziky
  • Anotace:
    This paper is a sequel to the 1998 review paper “Scientific status of the Dense Plasma Focus” with 16 authors belonging to 16 nations, whose initiative led to the establishment of the International Center for Dense Magnetized Plasmas (ICDMP) in the year 2000. Its focus is on understanding the principal defining characteristic features of the plasma focus in the light of the developments that have taken place in the last 20 years, in terms of new facilities, diagnostics, models, and insights. Although it is too soon to proclaim with certainty what the plasma focus phenomenon is, the results available to date conclusively indicate what it is demonstrably not. The review looks at the experimental data, cross-correlated across multiple diagnostics and multiple devices, to delineate the contours of an emerging narrative that is fascinatingly different from the standard narrative, which has guided the consensus in the plasma focus community for several decades, without invalidating it. It raises a question mark over the Fundamental Premise of Controlled Fusion Research, namely, that any fusion reaction having the character of a beam-target process must necessarily be more inefficient than a thermonuclear process with a confined thermal plasma at a suitably high temperature. Open questions that need attention of researchers are highlighted. A future course of action is suggested that individual plasma focus laboratories could adopt in order to positively influence the future growth of research in this field, to the general benefit of not only the controlled fusion research community but also the world at large.

Characteristics of closed currents and magnetic fields outside the dense pinch column in a plasma focus discharge

  • DOI: 10.1063/5.0010249
  • Odkaz: https://doi.org/10.1063/5.0010249
  • Pracoviště: Katedra fyziky
  • Anotace:
    This paper describes the structure of a higher extreme ultraviolet (XUV) emission and plasma density region which surrounds a pinched dense-plasma column. It is interpreted as a toroidal-like plasma formation, which is flowing by a closed current with poloidal and toroidal components upon its surface. This current produces a local magnetic field, which separates the external discharge current from the surface of the dense pinch column. We estimated the values of closed currents as well as magnetic- and plasma-pressures in this column and its surrounding on the basis of the measured distribution of interferometric fringes and intense XUV emission, recorded during the pinch stagnation phase. The considered layer forms the region in which the magnetic energy can be conserved, and during its decay, the acceleration of fast deuterons can take place.

Hot electron retention in laser plasma created under terawatt subnanosecond irradiation of Cu targets

  • Autoři: Pisarczyk, T., Kálal, M., Gus'kov, S., Batani, D., Renner, O., Santos, J., Dudzak, R., Chodukowski, T., Krupka, M., Ing. Jakub Cikhardt, Ph.D., Krůs, M., prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Plasma Physics and Controlled Fusion. 2020, 62(11), ISSN 0741-3335.
  • Rok: 2020
  • DOI: 10.1088/1361-6587/abb74b
  • Odkaz: https://doi.org/10.1088/1361-6587/abb74b
  • Pracoviště: Katedra fyziky
  • Anotace:
    Laser plasma created by intense light interaction with matter plays an important role in high-energy density fundamental studies and many prospective applications. Terawatt laser-produced plasma related to the low collisional and relativistic domain may form supersonic flows and is prone to the generation of strong spontaneous magnetic fields. The comprehensive experimental study presented in this work provides a reference point for the theoretical description of laser-plasma interaction, focusing on the hot electron generation. It experimentally quantifies the phenomenon of hot electron retention, which serves as a boundary condition for most plasma expansion models. Hot electrons, being responsible for nonlocal thermal and electric conductivities, are important for a large variety of processes in such plasmas. The multiple-frame complex-interferometric data providing information on time resolved spontaneous magnetic fields and electron density distribution, complemented by particle spectra and x-ray measurements, were obtained under irradiation of the planar massive Cu and plastic-coated targets by the iodine laser pulse with an intensity of above 10(16)W cm(-2). The data shows that the hot electron emission from the interaction region outside the target is strongly suppressed, while the electron flow inside the target,i.e.in the direction of the incident laser beam, is a dominant process and contains almost the whole hot electron population. The obtained quantitative characterization of this phenomenon is of primary importance for plasma applications spanning from ICF to laser-driven discharge magnetic field generators.

Ion acceleration and neutron production in hybrid gas-puff z-pinches on the GIT-12 and HAWK generators

  • DOI: 10.1063/1.5132845
  • Odkaz: https://doi.org/10.1063/1.5132845
  • Pracoviště: Katedra fyziky
  • Anotace:
    Z- pinch experiments with a hybrid configuration of a deuterium gas puff have been carried out on the HAWK (NRL, Washington, DC) and GIT-12 (IHCE, Tomsk) pulsed power generators at 0.7 MA and 3 MA currents, respectively. On GIT-12, neutron yields reached an average value of 2 X 10(12) neutrons, and deuterons were accelerated up to an energy of 30 MeV. This was 50 times the ion energy provided by the generator driving voltage of 0.6 MV and the highest energy observed in z-pinches and dense plasma foci. To confirm these unique results independently on another device, we performed several experimental campaigns on the HAWK generator. Comparison of the experiments on GIT-12 and HAWK helped us to understand which parameters are essential for optimized neutron production. Since the HAWK generator is of a similar pulsed power architecture as GIT-12, the experiments on GIT-12 and HAWK are important for the study of how charged-particle acceleration scales with the current. (C) 2020 Author(s).

Neutron fluence distribution in experiments with 3 MA deuterium gas-puff z-pinch

  • DOI: 10.1063/5.0008108
  • Odkaz: https://doi.org/10.1063/5.0008108
  • Pracoviště: Katedra fyziky
  • Anotace:
    Deuterium gas-puff z-pinches are very efficient laboratory sources of neutron pulses. Using a novel hybrid gas-puff load on the GIT-12 generator, a significant increase in the neutron yields up to

Production of energetic protons, deuterons, and neutrons up to 60 MeV via disruption of a current-carrying plasma column at 3 MA

  • DOI: 10.1088/1367-2630/abbab5
  • Odkaz: https://doi.org/10.1088/1367-2630/abbab5
  • Pracoviště: Katedra fyziky
  • Anotace:
    Acceleration of ions to multi-MeV energies is investigated in various plasma devices to better understand processes in astrophysical plasmas and to develop efficient accelerators for a variety of applications. This paper reports the production of proton, deuteron, and electron beams in a z-pinch-a cylindrically symmetric plasma column that is compressed by its own magnetic field. For this work, the GIT-12 pulsed-power generator was used to drive a novel configuration of z-pinch that dramatically enhanced ion acceleration associated with disruption of the current by instabilities in the compressed plasma. During the disruption of 3 MA current, hydrogen ions were accelerated up to at least 50 MeV, which is almost a hundred-times the ion energy provided by the generator driving voltage of 0.6 MV. Under optimal conditions, the total numbers of hydrogen ions with energies above 20 and 50 MeV were 4 x 10(13)and 10(11), respectively. Accelerated deuterons produced one 20 ns (full width at half maximum) pulse of fast neutrons via D(d, n)He-3 and other nuclear reactions. A maximum neutron output of (1.0 +/- 0.2) x 10(12)neutrons/sr was observed downstream, i.e., in the anode to cathode direction. In this direction, the maximum neutron energy reached 58 +/- 7 MeV. Both ion and neutron beams in our experiment reached an end-point energy of about 60 MeV, which is the highest value observed in pulsed-power devices. A localized peak voltage of greater than or similar to 60 MV was driven by the inductive energy that was stored around the plasma column and that was extracted during a sub-nanosecond current drop. Considering the natural occurrence of current-carrying columns in laboratory and space plasmas, the current interruption observed in z-pinches could represent a more general physical process that contributes to the efficient conversion of magnetic energy into the energy of particle beams in various plasmas.

Recent Achievements of Plasma Studies within PF-1000U Facility

  • Autoři: Sadowski, J.M., Paduch, M., prof. RNDr. Pavel Kubeš, CSc., Krauz, V.I., Gribkov, V.A.
  • Publikace: Acta Physica Polonica A. 2020, 138(4), 613-621. ISSN 0587-4246.
  • Rok: 2020
  • DOI: 10.12693/APhysPolA.138.613
  • Odkaz: https://doi.org/10.12693/APhysPolA.138.613
  • Pracoviště: Katedra fyziky
  • Anotace:
    This paper presents the most important results of recent plasma studies performed within the PF-1000U facility at the IPPLM in Warsaw, Poland. It was shown that a conical-tip of the anode facilitates the pinch formation and induces an increase in the total neutron yield, while the use of an anti-anode shortens the pinch column but does not improve the fusion-neutron emission. Experiments confirmed that the initial gas conditions have a strong influence on plasma parameters and, at some conditions, the local electron temperatures can reach high values ranging between 5 and 8 keV. It was shown that PF-1000U discharges with the H2-filling generate intense proton beams which can be used for research on (p–11B) fusion reactions. It was also demonstrated that at the appropriate gas puffing the PF-1000U facility generates long plasma jets which can be used for simulations of astrophysical phenomena. Research on interactions of intense plasma streams with different solid targets showed that the facility can be useful for material engineering, e.g. for studies of plasma facing components of a future thermonuclear reactor DEMO. Measurements of fast deuteron beams provided information about their angular distribution and energy spectra. The evolution of a pinch column during the emission of charged particle beams was also observed and analyzed.

Scenario of a magnetic dynamo and magnetic reconnection in a plasma focus discharge

  • DOI: 10.1063/1.5133103
  • Odkaz: https://doi.org/10.1063/1.5133103
  • Pracoviště: Katedra fyziky
  • Anotace:
    The paper discusses a possible energy transformation that leads to the acceleration of fast ions and electrons. In plasma-focus discharges that occur during deuteriumfilling, which have a maximum current of about 1MA, the accelerated deuterons producefastfusion neutrons andfast electrons hard X-ray emissions. Their total energy, which is of the order of several kilojoules, can be delivered by the discharge through a magnetic dynamo and selforganization to the ordered plasma structures that are formed in a pinch during the several hundreds of nanoseconds of the pinch implosion, stagnation, and evolution of instabilities. This energy is finally released during the decay of the ordered plasma structures in the volume between the anode face and the umbrella front of the plasma and current sheath in the form of induced electric fields that accelerate fast electrons and ions.

Spatial distribution of ion emission in gas-puff z-pinches and dense plasma foci

  • DOI: 10.1088/1361-6587/ab6902
  • Odkaz: https://doi.org/10.1088/1361-6587/ab6902
  • Pracoviště: Katedra fyziky
  • Anotace:
    Mega-ampere dense plasma foci and deuterium gas-puff z-pinches can accelerate deuterons to multi-MeV energies. Diagnostic measurements of the properties of these ions provide information about ion acceleration in z-pinch plasmas. In particular, the results from ion pinhole cameras seem to be useful for the discussion of ion acceleration mechanisms. Recently, we have used various configurations of ion pinhole cameras in deuterium gas-puff experiments on the GIT-12 generator at the Institute of High Current Electronics in Tomsk and on the HAWK generator at the US Naval Research Laboratory in Washington. The stack of radiochromic films and CR-39 solid-state nuclear track detectors recorded deuterons with energies up to 30 MeV. From our ion diagnostics, we obtained the spatial distribution of the ion source and the ion-beam divergence during the ion emission. This ion-beam divergence was found to decrease with increasing deuteron energy. At 20 MeV, the divergence of each of the individual micro-beams that composed the ion source was on the order of 10 mrad. The deflection of each micro-beam due to the azimuthal magnetic and/or radial electric fields resulted in radial stripes observed by the beam-profile detectors. By analyzing the ion pinhole images, we found that the deuterons were emitted both from a central spot and from a ring-shaped region with a rather large diameter, on the order of 1 cm. The origin and particular diameter of this ring is attributed to the geometry of the electrodes and to the distribution of the current density before the disruption.

Acceleration of protons and deuterons up to 35 MeV and generation of 10(13) neutrons in a megaampere deuterium gas-puff z-pinch

  • DOI: 10.1088/1361-6587/aadc99
  • Odkaz: https://doi.org/10.1088/1361-6587/aadc99
  • Pracoviště: Katedra fyziky
  • Anotace:
    The acceleration of hydrogen ions up to 35 MeV is observed in the z-pinch experiments on the GIT-12 generator at a 3 MA current and 0.6 MV driving voltage. High ion energies are obtained with a novel configuration of a deuterium gas-puff z-pinch. In this configuration, a hollow cylindrical plasma shell is injected around an inner deuterium gas puff to form a homogeneous, uniformly conducting layer between electrodes at the initial phase of z-pinch implosion. The stable implosion at the velocity up to 650 km s(-1) is important to deliver more current onto the z-pinch axis. Magnetohydrodynamic instabilities become apparent first at stagnation. After the disruptive development of m = 0 instabilities, similar to 20 ns pulses of high-energy photons, neutrons, electrons, and ions are observed. The average neutron yield is 2 x 10(12). The ion emission is characterized by various diagnostic techniques including those based on the usage of neutron-producing samples. When a large neutron-producing sample is placed onto the axis below a cathode mesh, the neutron yield is increased up to (1.1 +/- 0.3) x 10(13). Considering a similar to 130 kJ energy input into z-pinch plasmas and magnetic field, this implies the neutron production efficiency of similar to 10(8) neutrons per one Joule of the z-pinch energy.

Evolution of a Pinch Column During the Acceleration of Fast Electrons and Deuterons in a Plasma-Focus Discharge

  • DOI: 10.1109/TPS.2018.2874288
  • Odkaz: https://doi.org/10.1109/TPS.2018.2874288
  • Pracoviště: Katedra fyziky
  • Anotace:
    Plasma in a pinch column, as produced by a plasma-focus discharge at the deuterium filling and the current intensity reaching 1 MA, was investigated at the total neutron yield reaching about 1010 per discharge. The use was made of neutron diagnostics, laser interferometry, soft X-ray measurements, optical emission spectroscopy, magnetic probes, as well as electron and ion measurements with the temporal, spatial, and energetic resolutions. The detailed studies showed the ordered toroidal, helical, and plasmoidal structures which could contain currents with poloidal and toroidal components and their associated magnetic fields. Their spontaneous transformations were explained by changes in a topology of magnetic field lines due to magnetic reconnections. A nonthermal acceleration of fast electrons and ions (producing hard X-rays and fusion neutrons, respectively) corresponded to: 1) the formation of plasmoids in the pinch column and 2) a decay of pinch constrictions and secondary plasmoids during the evolution of instabilities. A filamentary structure of the current flow could explain the high energy density and fast transformations of the magnetic energy into kinetic energy of electron and ion beams (reaching energy of hundreds of kiloelectronvolt). This paper summarizes the results obtained with the PF-1000 facility in 2009–2017, and describes the internal transformations in a dense plasma column during the evolution of MHD instabilities.

Evolution of the Pinched Column During Hard X-ray and Neutron Emission in a Dense Plasma Focus

  • DOI: 10.1007/s10894-018-0194-x
  • Odkaz: https://doi.org/10.1007/s10894-018-0194-x
  • Pracoviště: Katedra fyziky
  • Anotace:
    The paper summarizes important results of the recent experimental studies performed on the plasma-focus PF-1000 facility operated in Warsaw, Poland, mainly with the pure deuterium filling. Attention is focused on the evolution of toroidal and plasmoidal self-organized structures formed by internal closed currents inside the dense plasma column. The production of hard x-rays and neutrons corresponds with the formation and decay of plasmoids, in which charged particles can be accelerated effectively to high energies, during a release of the magnetic energy from current filaments of high energy density. It is noticed that the studies of laboratory fusion and cosmic plasmas deal with similar problems, e.g., the fast release of the magnetic energy in a form of high-energy charged particle beams.

Features of fast deuterons emitted from plasma focus discharges

  • DOI: 10.1063/1.5080974
  • Odkaz: https://doi.org/10.1063/1.5080974
  • Pracoviště: Katedra fyziky
  • Anotace:
    This paper presents the discussion concerning the characteristics of the fast deuterons which have energy above 30 keV and are recorded during high-current plasma-focus (PF) discharges, by means of PM-355 plastic track-detectors placed inside ion pinhole cameras. The fast deuterons evoke D-D fusion reactions, mainly by a beam-target mechanism. The distribution of the magnetic field, which influences the trajectories of the recorded deuterons, is discussed. It is found that the fast deuterons are produced in various local sources and their motion is strongly influenced by a circular symmetry of the local magnetic field, which increases their radial shift with a decrease in their energy. The sources of these deuterons are probably located inside the plasmoids and in some local regions of the ring-shaped plasma structures. These ring-structures can be formed outside the dense pinch column, up to a radius of 5 cm. Global magnetic fields, associated with the total current flow in the PF discharge, have a weaker influence. The observed radial shift of the recorded fast deuterons is interpreted as a result of their deflection by magnetic fields which have opposite orientations of the azimuthal components, associated with the currents flowing in directions towards and from the applied ion detectors. The local sources of the recorded fast deuterons correspond to filamentary structures, in which the stored magnetic energy (having the local high density) can be released in induced electric fields accelerating the deuterons during the magnetic reconnections.

Influence of an external additional magnetic field on the formation of a plasma column in a dense plasma focus

  • DOI: 10.1063/1.5094568
  • Odkaz: https://doi.org/10.1063/1.5094568
  • Pracoviště: Katedra fyziky
  • Anotace:
    This paper concerns the evolution of internal structures and the neutron production in plasma-focus discharges performed in the presence of a permanent magnet (placed inside the anode front) and within a residual magnetic field (after the removal of this magnet). The initial magnetic field generated by this magnet prevented: (i) the effective compression of a dense pinch column, (ii) the formation of plasma organized structures, and (iii) the evolution of plasma instabilities. The experimental results have shown an increase in the initial magnetic field due to a magnetic dynamo effect in the presence of the permanent magnet, as well as in a series of shots performed after its removal. It was observed that the appearance of plasmoidal structures is necessary for the emission of fusion neutrons. A characteristic quasicylindrical plasma layer of the radius corresponding to the plasma lobule tops, which might be identified with a ring region of the acceleration of fast deuterons, was also observed.

Axial compression of plasma structures in a plasma focus discharge

  • DOI: 10.1063/1.5033997
  • Odkaz: https://doi.org/10.1063/1.5033997
  • Pracoviště: Katedra fyziky
  • Anotace:
    The paper describes the behaviour of plasma within a MA plasma-focus with a novel electrode configuration, in which the anode and anti-anode were both equipped with conical tips. This configuration was applied to test the possibility of reducing the pinch axial dimensions during the radial compression of a current sheath. It made it possible to strengthen a dense plasma jet near the anode end, which ejected plasma into a bigger plasmoidal structure formed in the central pinch region. It did not allow forming an opposite anti-anode jet and stopped the axial motion of this structure. In plasma focus discharges with the deuterium filling, the decay of the anode jet and the corresponding plasmoid evolution were accompanied by the fusion-neutron production. Some results obtained with this configuration have also supported the hypothesis of the acceleration of fast electrons and ions at a release of the magnetic energy during magnetic reconnections in the organized dense plasma structures.

Characterization of fast deuterons involved in the production of fusion neutrons in a dense plasma focus

  • DOI: 10.1063/1.5012021
  • Odkaz: https://doi.org/10.1063/1.5012021
  • Pracoviště: Katedra fyziky
  • Anotace:
    This paper considers regions of a fast deuteron production in a correlation with an evolution of ordered structures inside a pinch column of a mega-ampere plasma focus discharge. Ion pinhole cameras equipped with plastic PM-355 track-detectors recorded fast deuterons escaping in the downstream and other directions (up to 60 to the z-axis). Time-integrated ion images made it possible to estimate sources of the deuteron acceleration at the known magnetic field and deuteron energy values. The images of the fast deuterons emitted in the solid angle ranging from 0 to 4 showed two forms: central spots and circular images. The spots of 1–2 cm in diameter were produced by deuterons from the central pinch regions. The circular-shaped images of a radius above 3 cm (or their parts) were formed by deuterons from the region surrounding the dense pinch column. The ion pinhole cameras placed at angles above 20 to the z-axis recorded the ion spots only, and the ring-images were missing. The central region of the deuteron acceleration could be associated mainly with plasmoids, and the circular images could be connected with ring-shaped regions of the radius corresponding to tops of the plasma lobules outside the dense pinch column. The deuteron tracks forming ring-shaped images of a smaller (0.5–1) cm radius could be produced by deflections of the fast deuterons, which were caused by a magnetic field inside the dense pinch column.

Investigation of Magnetic Fields in Z-Pinches via Multi-MeV Proton Deflectometry

  • DOI: 10.1109/TPS.2018.2874207
  • Odkaz: https://doi.org/10.1109/TPS.2018.2874207
  • Pracoviště: Katedra fyziky
  • Anotace:
    Proton deflectometry is a promising way for mapping electric and magnetic fields in high-density and high-temperature plasmas, where an application of the classical methods (B-dot probes, Faraday rotation, and Zeeman splitting) is limited. It is based on the detection of a multi-MeV proton beam deflected in examined B-fields. In the past years, it has been successfully utilized in laser-generated plasmas for E-field and B-field measurements. Using our numerical code, we investigate the capabilities of proton deflectometry as a diagnostic method of MA Z-pinches. We simulate proton trajectories propagating through typical Z-pinch B-fields in two fundamental experimental setups (radial and axial) in order to study synthetic images (deflectograms). We demonstrate where proton deflectometry might be beneficial for the Z-pinch research. We explain a formation of the key features of deflectograms, which give us information about a profile and strength of the Z-pinch B-fields. We introduce a BL parameter, denoting an effective B-field averaged along the deflected proton orbit and show its importance for the proton deflectometry.

Ion acceleration mechanism in mega-ampere gas-puff z-pinches

  • DOI: 10.1088/1367-2630/aac545
  • Odkaz: https://doi.org/10.1088/1367-2630/aac545
  • Pracoviště: Katedra fyziky
  • Anotace:
    Acceleration of high energy ions was observed in z-pinches and dense plasma foci as early as the 1950s. Even though many theories have been suggested, the ion acceleration mechanism remains a source of controversy. Recently, the experiments on the GIT-12 generator demonstrated acceleration of ions up to 30 MeV from a deuterium gas-puff z-pinch. High deuteron energies enable us to obtain unique information about spatial, spectral and temporal properties of accelerated ions. In particular, the off-axis ion emission from concentric circles of a similar to 1 cm diameter and the radial lines in an ion beam profile are germane for the discussion of acceleration mechanisms. The acceleration of 30 MeV deuterons can be explained by the fast increase of an impedance with a sub-nanosecond e-folding time. The high (> 10 Omega) impedance is attributed to a space-charge limited flow after the effective ejection of plasmas from m = 0 constrictions. Detailed knowledge of the ion acceleration mechanism is used with a neutron-producing catcher to increase neutron yields above 10^13 at a current. of. 2.7 MA.

Magnetized plasma implosion in a snail target driven by a moderate intensity laser pulse

  • DOI: 10.1038/s41598-018-36176-8
  • Odkaz: https://doi.org/10.1038/s41598-018-36176-8
  • Pracoviště: Katedra fyziky
  • Anotace:
    Optical generation of compact magnetized plasma structures is studied in the moderate intensity domain. A sub-ns laser beam irradiated snail-shaped targets with the intensity of about 10(16) W/cm(2). With a neat optical diagnostics, a sub-megagauss magnetized plasmoid is traced inside the target. On the observed hydrodynamic time scale, the hot plasma formation achieves a theta-pinch-like density and magnetic field distribution, which implodes into the target interior. This simple and elegant plasma magnetization scheme in the moderate-intensity domain is of particular interest for fundamental astrophysical-related studies and for development of future technologies.

Experimental research of neutron yield and spectrum from deuterium gas-puff z-pinch on the GIT-12 generator at current above 2 MA

  • DOI: 10.1088/1742-6596/830/1/012017
  • Odkaz: https://doi.org/10.1088/1742-6596/830/1/012017
  • Pracoviště: Katedra fyziky
  • Anotace:
    The Z-pinch experiments with deuterium gas-puff surrounded by an outer plasma shell were carried out on the GIT-12 generator (Tomsk, Russia) at currents of 2 MA. The plasma shell consisting of hydrogen and carbon ions was formed by 48 plasma guns. The deuterium gas-puff was created by a fast electromagnetic valve. This configuration provides an efficient mode of the neutron production in DD reaction, and the neutron yield reaches a value above 10^12 neutrons per shot. Neutron diagnostics included scintillation TOF detectors for determination of the neutron energy spectrum, bubble detectors BD-PND, a silver activation detector, and several activation samples for determination of the neutron yield analysed by a Sodium Iodide (NaI) and a high-purity Germanium (HPGe) detectors. Using this neutron diagnostic complex, we measured the total neutron yield and amount of high-energy neutrons.

Filamentation in the pinched column of the dense plasma focus

  • DOI: 10.1063/1.4978558
  • Odkaz: https://doi.org/10.1063/1.4978558
  • Pracoviště: Katedra fyziky
  • Anotace:
    The paper describes the filamentary structure observed in the high-energy ultraviolet radiation for discharges performed at the hydrogen- or deuterium-filling and at the puffing of hydrogen, deuterium or helium, in a mega-ampere dense plasma-focus facility. The lifetime of this structure overcomes 50ns. These filaments connect the surface of a pinched column with internal plasmoids formed at different combinations of filling and puffing gases and they should transport some current and plasma. During all the investigated deuterium shots, the fusion-produced neutrons were recorded. Therefore, deuterons should be present in the region of their acceleration, independent of the applied puffing of the gas. Simultaneously with the observed filaments, inside the dense plasma column small plasma-balls of mm-dimensions were observed, which had a similar lifetime (longer than the relaxation time) and quasi-stationary positions in the discharge volume. The observed filaments and balls might be a manifestation of the (i) discrete spatial structure of the current flowing through and around the dense plasma column and (ii) transport of the plasma from external layers to the central region. Their formation and visualization were easier due to the application of air admixtures in the puffed gas. Published by AIP Publishing.

Increase in the neutron yield from a dense plasma-focus experiment performed with a conical tip placed in the centre of the anode end

  • DOI: 10.1063/1.4994097
  • Odkaz: https://doi.org/10.1063/1.4994097
  • Pracoviště: Katedra fyziky
  • Anotace:
    The paper describes the evolution of self-organized structures inside a pinched plasma column during the phase of the effective production of fusion neutrons, as observed in the mega-ampere plasma focus experiment performed with a conical tip placed in the centre of the anode face. In a comparison with the plane anode face configuration, the described anode shape facilitated transformations in the pinch column during the neutron production and increased the neutron yield several times. Simultaneously, it decreased the minimal diameter and the length of the pinched column, and it depressed the first neutron pulse. It also induced shorter pulses of X-rays and neutrons, which enabled the determination of a temporal difference between the emission of electron and deuteron beams. The fast electrons were produced mainly during a disruption of the pinch constriction, while the fast deuterons – during the formation and explosion of plasmoids. The paper also presents the temporal evolution of a current distribution in the plasmoid during the neutron production, as well as the appearance and stable positions of current filaments traces upon the surface of the conical anode tip.

Kinetic magnetization by fast electrons in laser-produced plasmas at sub-relativistic intensities

  • DOI: 10.1063/1.4995044
  • Odkaz: https://doi.org/10.1063/1.4995044
  • Pracoviště: Katedra fyziky
  • Anotace:
    The problem of spontaneous magnetic field generation with nanosecond laser pulses raises a series of fundamental questions, including the intrinsic magnetization mechanisms in laser-driven plasmas and the understanding of charge-discharge processes in the irradiated target. These two issues are tightly bound as the charge-discharge processes are defined by the currents, which have in turn a feedback by magnetic fields in the plasma. Using direct polaro-interferometric measurements and theoretical analysis, we show that at parameters related to the PALS laser system (1.315 mu m, 350 ps, and 10(16) W/cm(2)), fast electrons play a decisive role in the generation of magnetic fields in the laser-driven plasma. Spatial distributions of electric currents were calculated from the measured magnetic field and plasma density distributions. The obtained results revealed the characteristics of strong currents observed in capacitor-coil magnetic generation schemes and open a new approach to fundamental studies related to magnetized plasmas.

Neutron Spectrum Measured by Activation Diagnostics in Deuterium Gas-Puff Experiments on the 3 MA GIT-12 Z-Pinch

  • DOI: 10.1109/TPS.2017.2763641
  • Odkaz: https://doi.org/10.1109/TPS.2017.2763641
  • Pracoviště: Katedra fyziky
  • Anotace:
    A set of neutron diagnostics including scintillation time-of-flight detectors, bubble detectors, and several kinds of threshold nuclear activation samples is used to obtain information about the yield and spectrum of the neutrons produced by a deuterium gas-puff z-pinch. The experiments are performed at a current of about 3 MA on the GIT-12 generator at the Institute of High Current Electronics of the Siberian Branch of Russian Academy of Sciences in Tomsk. The average neutron yield in the experiments in 2016 was 2.3 x 10¹² neutrons per single shot. Using the data obtained with the help of neutron activation diagnostics, the time-of-flight detectors have been absolutely calibrated and the broad energy spectrum of the produced neutrons was evaluated. By the calculations presented in this paper, due to the multi-MeV energies of deuterons generated in the pinch, up to 15% of the total neutron yield could be produced by nuclear reactions of deuterons with a stainless steel vacuum chamber and aluminum components of the diagnostic apparatus inside the chamber.

Transformation of the ordered internal structures during the acceleration of fast charged particles in a dense plasma focus

  • DOI: 10.1063/1.4991384
  • Odkaz: https://doi.org/10.1063/1.4991384
  • Pracoviště: Katedra fyziky
  • Anotace:
    The paper concerns important differences in the evolution of plasma column structures during the production of fusion neutrons in the first and subsequent neutron pulses, as observed for plasma focus discharges performed with the deuterium filling. The first neutron pulse, of a more isotropic distribution, is usually produced during the formation of the first big plasmoid. The next neutron pulses can be generated by the fast deuterons moving dominantly in the downstream direction, at the instants of a disruption of the pinch constriction, when other plasmoids are formed during the constriction evolution. In both cases, the fusion neutrons are produced by a beam-target mechanism, and the acceleration of fast electron- and deuteron-beams can be interpreted by transformation and decay of the magnetic field associated with a filamentary structure of the current flow in the plasmoid.

Comprehensive investigation of laser energy transport to a massive planar targets with femtosecond polaro-interferometry

  • Pracoviště: Katedra fyziky
  • Anotace:
    The experiments were realized on Prague Asterix Laser System (PALS) using the first harmonic of the iodine laser beam with the energy in range of 100- 500 J and the pulse duration of 350 ps. The plasma was created by the irradiation of the bare and plastic coated Cu massive planar targets using both the linear and the circular polarized laser beam which was focused to the minimum focal spot radius of RL=50 um. The primary goal of the current project is to understand the interrelation of spontaneous magnetic field (SMF) creation and fast electron generation in laser plasma produced from planar targets. Two-channel polarointerferometer and the crater volume measurements were applied as the main diagnostics to investigate SMF and efficiency of laser energy transfer to the target. The differences in the fast electron production due to the polarization of the laser beam were monitored by 2D imaging of the Cu K-alpha emission source in the irradiated target. The measured distributions of the SMF during the interaction of the laser pulse with the ablative plasma clearly show that the SMF amplitude is higher in the case of the linearly polarized beam. The data on the efficiency of laser energy transport into the massive target was concluded using the ratio of measured values of total number of thermal electrons of ablated plasma and crater volume. Slightly higher fast electron emission was observed at the circular polarization of the laser beam incident on both bare and plastic coated Cu targets. As an additional diagnostic, the measurements of the total current flowing through the target were carried out by means of the current probe and the found values were compared with results from the SMF measurements.

Conditions for Radiative Cooling and Collapse in the Plasma Focus Illustrated With Numerical Experiments on PF1000

  • Autoři: Lee, S., Saw, H. S., Akel, M., Ali, J., Kunze, H.-J., prof. RNDr. Pavel Kubeš, CSc., Paduch, M.
  • Publikace: IEEE Transactions on Plasma Science. 2016, 44(2), 165-173. ISSN 0093-3813.
  • Rok: 2016
  • DOI: 10.1109/TPS.2015.2497269
  • Odkaz: https://doi.org/10.1109/TPS.2015.2497269
  • Pracoviště: Katedra fyziky
  • Anotace:
    Reduced Pease–Braginskii currents are estimated for a linear pinch in a range of gases, namely, D, He, Ne, Ar, Kr, and Xe. A characteristic depletion time is defined as the time it takes for the plasma focus (PF) pinch energy to be radiated away. This quantity is used as an indicator for expectation of radiative collapse. The depletion times in various gases are estimated in units of pinch duration. The values indicate that in D and He, the radiation powers are small, resulting in such long depletion times that no radiative collapse may be expected in the lifetime of the focus pinch. In Ne, low tens of percent are radiated and significant cooling and reduction in radius ratio may be anticipated. In Ar, Kr, and Xe, the depletion time is only a fraction of the estimated pinch duration, so radiative collapse may be expected. Numerical experiments are then carried out with a circuit-coupled code, which incorporates radiation-coupled dynamics with PF pinch elongation and plasma self-absorption. The latter eventually limits the radiated power and stops the radiative collapse. These results show the detailed dynamics and confirm the expectations arising from depletion times discussed above.

Deuterium z-pinch as a powerful source of multi-MeV ions and neutrons for advanced applications

  • DOI: 10.1063/1.4942944
  • Odkaz: https://doi.org/10.1063/1.4942944
  • Pracoviště: Katedra fyziky
  • Anotace:
    A novel configuration of a deuterium z-pinch has been used to generate a nanosecond pulse of fast ions and neutrons. At a 3 MA current, the peak neutron yield of (3.6 +/- 0.5) x 10(12) was emitted within 20 ns implying the production rate of 10 20 neutrons/s. High neutron yields resulted from the magnetization of MeV deuterons inside plasmas. Whereas deuterons were trapped in the radial direction, a lot of fast ions escaped the z-pinch along the z-axis. A large number of >25MeV ions were emitted into a 250 mrad cone. The cut-off energy of broad energy spectra of hydrogen ions approached 40 MeV. The total number of >1 MeV and >25 MeV deuterons were 10(16) and 10(13), respectively. Utilizing these ions offers a real possibility of various applications, including the increase of neutron yields or the production of short-lived isotopes in samples placed in ion paths. On the basis of our experiments with various samples, we concluded that a single shot would have been sufficient to obtain GBq positron activity of 13 N isotopes via the C-12(d, n)(13) N reaction. Furthermore, the first z-pinch generated neutron radiograph produced by approximate to 20 ns pulses is presented in this paper. (C) 2016 AIP Publishing LLC.

Evolution of the small ball-like structures in the plasma focus discharge

  • DOI: 10.1515/nuka-2016-0027
  • Odkaz: https://doi.org/10.1515/nuka-2016-0027
  • Pracoviště: Katedra fyziky
  • Anotace:
    The experiments were carried out in the PF-1000 plasma-focus device at the maximum current reaching about 2 MA, at the deuterium or neon filling and with deuterium injected from a gas-puff nozzle placed on the axis of the anode face. Ball-like structures of diameters of 1-12 mm were identified in interferometric and XUV pinhole camera frames. We made the statistical description of their parameters. A lifetime of the ball-like structures was in the range from 30 to 210 ns, and in some cases even more. These structures appeared mostly at the surface of the imploding plasma shell and they did not change their position in relation to the anode end. During the evolution of these structures, interferometric fringes were observed near the surfaces of the structures only, and their internal parts were initially chaotic (without noticeable) fringes. Subsequently the number of interferometric fringes increased (the internal 'chaotic' area was filled with fringes too) and later on it decreased. The radii of the ball-like structures were mostly increasing during their existence. The maximum electron density reached the value of 10(24) to 10(25) m(-3). The ball-like structures decayed by absorption inside the expanded pinch column and/or gradually expired in rare plasma outside of the dense plasma column.

Experiments and simulations on the possibility of radiative contraction/collapse in the PF-1000 plasma focus

  • DOI: 10.1515/nuka-2016-0025
  • Odkaz: https://doi.org/10.1515/nuka-2016-0025
  • Pracoviště: Katedra fyziky
  • Anotace:
    Experimental studies of discharges in the plasma focus facility with neon fi lling and respective numerical simulations employing the radiative Lee code are reported. The pinch currents exceed the Pease-Braginskii current, which indicates that radiative losses are larger than heating and that contraction of the formed plasma should occur. Both of these effects were indeed observed. Parallel numerical simulations were crucial for the identifi cation of such an effect.

Influence of the Al wire placed in the anode axis on the transformation of the deuterium plasma column in the plasma focus discharge

  • DOI: 10.1063/1.4953569
  • Odkaz: https://doi.org/10.1063/1.4953569
  • Pracoviště: Katedra fyziky
  • Anotace:
    In this paper, we describe the influence of an Al wire of 270 lm in diameter placed along the anode axis on the transformation of the deuterium pinch column in a megaampere (MA) plasma focus device. The evolution of the pinched column and of the wire corona was investigated by means of the multiframe interferometry, neutron and X-ray diagnostics. The wire corona did not influence considerably on the evolution of dense plasma structures and neutron production, but it increased the plasma density and consequently, the currents around its surface. The distribution of the closed internal currents (ranging hundreds of kA) and associated magnetic fields amounting to 5 T were also estimated in the dense plasma column and in plasmoidal structures at the near-equilibrium state. The description is based on the balance of the plasma pressure and the pressure of the internal poloidal and toroidal current components compressed by the external pinched column. The dominant number of fusion deuterium-deuterium (D-D) neutrons is produced during the evolution of instabilities, when theuninterrupted wire corona (containing deuterium) connects the dense structures of the pinch, and it did not allow the formation of a constriction of the sub-millimeter diameter.

Interferometry and x-ray diagnostics of pinched helium plasma in a dense plasma focus with an Al-wire on the axis

  • DOI: 10.1063/1.4968227
  • Odkaz: https://doi.org/10.1063/1.4968227
  • Pracoviště: Katedra fyziky
  • Anotace:
    The paper describes the evolution of the ordered dense toroidal- and plasmoidal-like structures in a pinch column and the hard X-ray emission from mega-ampere dense plasma-focus discharges performed at the helium (He) filling. Some shots were carried out with an Al-wire of 270 lm in diameter, which was placed along the z-axis in the front of the anode face. The evolution of the considered structures was investigated by means of a multi-frame laser interferometer system as well as the X-ray diagnostics, and it was compared with their evolution observed earlier at the deuterium (D2) filling. In He-plasma, the ions had a higher mass and Z-number, and at the same initial filling pressure, the velocity of plasma transformations was decreased, but the stability of the investigated structures, as well as the self-generated azimuthal current component and the soft X-ray radiation were increased. The distribution of the plasma electron density (determined from the interferometric images) made it possible to estimate closed currents during the quasi-stationary phases. It was found that the internal toroidal- and plasmoidal-currents reached the level of hundreds of kA. The plasma corona around the Al-wire (penetrating through the internal structures) impeded the formation of a small diameter of the pinch constriction, but it did not prevent the production of fast electron beams with energies above 100 keV, similar to those observed at the D2-filling.

The evolution of the plasmoidal structure in the pinched column in plasma focus discharge

  • DOI: 10.1088/0741-3335/58/4/045005
  • Odkaz: https://doi.org/10.1088/0741-3335/58/4/045005
  • Pracoviště: Katedra fyziky
  • Anotace:
    In this paper, a description is provided of the evolution of the dense spherical-like structures— plasmoids—formed in the pinched column of the dense plasma focus at the current of 1 MA at the final phase of implosion of the deuterium plasma sheath and at the phase of evolution of instabilities both at the time of HXR and neutron production. At the stratification of the plasma column, the plasma injected to the dense structures from the axially neighboring regions forms small turbulences which increase first the toroidal structures, and finally generates a nonchaotic current plasmoidal structure with central maximal density. This spontaneous evolution supports the hypothesis of the spheromak-like model of the plasmoid and its sub-millimeter analogy, high-energy spot. These spots, also called nodules formed in the filamentary structure of the current can be a source of the energy capable of accelerating the fast charged particles.

The influence of the nitrogen admixture on the evolution of a deuterium pinch column

  • DOI: 10.1063/1.4960825
  • Odkaz: https://doi.org/10.1063/1.4960825
  • Pracoviště: Katedra fyziky
  • Anotace:
    The application of a mixture of nitrogen and deuterium for the gas-puffing along the anode axis in deuterium plasma-focus discharges, as carried out at megaampere-level currents, enabled observations of the filamentary structure, and the decrease in the transformation velocity of the plasma column to be performed. It made possible to investigate the instability evolution during the production of hard X-rays and fast neutrons in more detail. The constriction of a plasma column transforms itself during the final phase of the compression into one or more small dense plasmoid-like structures which are separated by narrow necks. During the next phase, these structures start to decay by an expansion, in which a part of the plasma volume maintains its compactness. This evolution is explained by an increase and later decrease in the internal poloidal current component by reconnections of the associated magnetic lines, which are responsible for the acceleration of electron and ion beams.

Efficiency of ablative plasma energy transfer into a massive aluminum target using different atomic number ablators

  • DOI: 10.1017/S0263034615000452
  • Odkaz: https://doi.org/10.1017/S0263034615000452
  • Pracoviště: Katedra fyziky
  • Anotace:
    This paper aims at investigation of efficiency of an ablative plasma energy transfer into a massive aluminum target using different atomic number ablators. For this reason, several target materials representing a wide range of atomic numbers (Z = 3.5-73) were used. The experiment was carried out at the iodine Prague Asterix Laser System. The laser provided a 250 ps pulse with energy of 130 J at the third harmonic frequency (lambda(3) = 0.438 mu m). To study the plasma stream configurations a four-frame X-ray pinhole camera was used. The electron temperature of the plasma in the near-surface target region was measured by means of an X-ray spectroscopy. The efficiency of the plasma energy transport to the target was determined via the crater volume measurement using the crater replica technique. The experimental results were compared with two-dimensional numerical simulations where the plasma dynamics was based on the one-fluid, two temperature model, including radiation transport in diffusive approximation and ionization kinetics. It was shown that the plasma expansion geometry plays an important role in the ablative plasma energy transfer into the target.

Efficient generation of fast neutrons by magnetized deuterons in an optimized deuterium gas-puff z-pinch

  • DOI: 10.1088/0741-3335/57/4/044005
  • Odkaz: https://doi.org/10.1088/0741-3335/57/4/044005
  • Pracoviště: Katedra fyziky
  • Anotace:
    Z-pinch experiments with deuterium gas puffs have been carried out on the GIT-12 generator at 3 MA currents. Recently, a novel configuration of a deuterium gas-puff z-pinch was used to accelerate deuterons and to generate fast neutrons. In order to form a homogeneous, uniformly conducting layer at a large initial radius, an inner deuterium gas puff was surrounded by an outer hollow cylindrical plasma shell. The plasma shell consisting of hydrogen and carbon ions was formed at the diameter of 350 mm by 48 plasma guns. A linear mass of the plasma shell was about 5 ug/cm whereas a total linear mass of deuterium gas in single or double shell gas puffs was about 100 mu g/cm. The implosion lasted 700 ns and seemed to be stable up to a 5 mm radius. During stagnation, m = 0 instabilities became more pronounced. When a disruption of necks occurred, the plasma impedance reached 0.4 Omega and high energy (>2 MeV) bremsstrahlung radiation together with high energy deuterons were produced. Maximum neutron energies of 33 MeV were observed by axial time-of-flight detectors. The observed neutron spectra could be explained by a suprathermal distribution of deuterons with a high energy tail. Neutron yields reached 3.6x10(12) at a 2.7 MA current. A high neutron production efficiency of 6x10(7) neutrons per one joule of plasma energy resulted from the generation of high energy deuterons and from their magnetization inside plasmas.

Existence of a return direction for plasma escaping from a pinched column in a plasma focus discharge

  • DOI: 10.1063/1.4921248
  • Odkaz: https://doi.org/10.1063/1.4921248
  • Pracoviště: Katedra fyziky
  • Anotace:
    The use of multi-frame interferometry used on the PF-1000 device with the deuterium filling showed the existence of a return motion of the top of several lobules of the pinched column formed at the pinched plasma column. This phenomenon was observed in the presence of an over-optimal mass in front of the anode, which depressed the intensity of the implosion and the smooth surface of the pinched plasma column. The observed evolution was explored through the use of closed poloidal currents transmitted outside the pinched plasma. This interpretation complements the scenario of the closed currents flowing within the structures inside the pinched column, which has been published recently on the basis of observations from interferometry, neutron, and magnetic probe diagnostics on this device.

Investigation of compression of puffing neon by deuterium current and plasma sheath in plasma focus discharge

  • DOI: 10.1063/1.4922483
  • Odkaz: https://doi.org/10.1063/1.4922483
  • Pracoviště: Katedra fyziky
  • Anotace:
    This paper presents the results of the research of the influence of compressed neon, injected by the gas-puff nozzle in front of the anode axis by the deuterium current and plasma sheath on the evolution of the pinch, and neutron production at the current of 2 MA. The intense soft X-ray emission shows the presence of neon in the central region of the pinch. During the implosion and stopping of the plasma sheath, the deuterium plasma penetrates into the internal neon layer. The total neutron yield of 1010–1011 has a similar level as in the pure deuterium shots. The neutron and hard X-ray pulses from fusion D-D reaction are as well emitted both in the phase of the stopping implosion and during the evolution of instabilities at the transformation of plasmoidal structures and constrictions composed in this configuration from both gases. The fast deuterons can be accelerated at the decay of magnetic field of the current filaments in these structures.

Puffing Deuterium Compressed by a Neon Plasma Sheath at the Initial Poloidal Magnetic Field in Plasma Focus Discharge

  • DOI: 10.1109/TPS.2015.2431858
  • Odkaz: https://doi.org/10.1109/TPS.2015.2431858
  • Pracoviště: Katedra fyziky
  • Anotace:
    This paper presents the results of the experimental study of the influence of the applied poloidal magnetic field on the transformation of the plasma column formed by the compression of (10 ± 3)-μg/cm deuterium injected by the gas-puff nozzle in front of the anode axis by the neon plasma sheath of (50 ± 10) μg/cm at a current of 2 MA. The permanent magnet with an initial induction of 20–40 mT placed inside the anode: 1) increased the diameter of the pinch and of the stagnation; 2) depressed the evolution of instabilities and formation of the dense structures in the column; 3) delayed the dip of the current derivative in time (and start of the hard X-ray and neutron emission) 200–300 ns after the first peak of the soft X-ray emission (and the pinch with a minimal diameter near the anode); and 4) decreased the total neutron yield to 10–20%. These results were interpreted in terms of the increase in the repulsive pressure of the compressed poloidal magnetic field, which ncreases the stabilizing helicity of the discharge current. The transformations are independent of the polarity of the magnet.

Temporal distribution of linear densities of the plasma column in a plasma focus discharge

  • DOI: 10.1515/nuka-2015-0065
  • Odkaz: https://doi.org/10.1515/nuka-2015-0065
  • Pracoviště: Katedra fyziky
  • Anotace:
    Experiments were carried out on the PF-1000 plasma focus device, with a deuterium filling and with deuterium puffing from a gas-puff nozzle placed on the axis of the anode face. The current was reaching 2 MA. 15 interferometric frames from one shot were recorded with a Nd:YLF laser and a Mach-Zehnder interferometer, with 10-20 ns delay between the frames. As a result, the temporal and spatial distribution of the linear densities and the radial and axial velocities of the moving of plasma in the dense plasma column could be estimated.

Current flow and energy balance during the evolution of instabilities in the plasma focus

  • DOI: 10.1088/0031-8949/2014/T161/014044
  • Odkaz: https://doi.org/10.1088/0031-8949/2014/T161/014044
  • Pracoviště: Katedra fyziky
  • Anotace:
    The unique diagnostic system at the plasma focus PF-1000 at the IPPLM in Warsaw, operating at 2MA and 1011 neutron yield, provides interferometry, x-ray, magnetic probes and neutron diagnostics together with registration of the voltage, current and its time derivative. With these diagnostic data we determined the boundaries of the dense plasma column from the interferograms and calculated the inductance for a single shot. The value of the current, voltage, current derivative, inductance and its derivative enabled calculation of the energy delivered to the pinch and energy released by the change of the inductance. The energy released during the expansion of the constriction was compared with the energy needed for acceleration of the deuterons producing neutrons calculated from the neutron pulse registered during and after the constriction expansion. The energy released by the expansion of the constriction is sufficient for deuteron acceleration.

Efficient Neutron Production from a Novel Configuration of Deuterium Gas-Puff Z-Pinch

  • DOI: 10.1103/PhysRevLett.112.095001
  • Odkaz: https://doi.org/10.1103/PhysRevLett.112.095001
  • Pracoviště: Katedra fyziky
  • Anotace:
    A novel configuration of a deuterium z pinch has been used to generate fusion neutrons. Injecting an outer hollow cylindrical plasma shell around an inner deuterium gas puff, neutron yields from DD reactions reached Y-n = (2.9 +/- 0.3) x 10(12) at 700 ns implosion time and 2.7 MA current. Such a neutron yield means a tenfold increase in comparison with previous deuterium gas puff experiments at the same current generator. The increase of beam-target yields was obtained by a larger amount of current assembled on the z-pinch axis, and subsequently by higher induced voltage and higher energies of deuterons. A stack of CR-39 track detectors on the z-pinch axis showed hydrogen ions up to 38 MeV. Maximum neutron energies of 15 and 22 MeV were observed by radial and axial time-of-flight detectors, respectively. The number of DD neutrons per one joule of stored plasma energy approached 5 x 10(7). This implies that deuterium gas puff z pinches belong to the most efficient plasma-based sources of DD neutrons.

Filamentary structure of plasma produced by compression of puffing deuterium by deuterium or neon plasma sheath on plasma-focus discharge

  • DOI: 10.1063/1.4903906
  • Odkaz: https://doi.org/10.1063/1.4903906
  • Pracoviště: Katedra fyziky
  • Anotace:
    The present experiments were performed on the PF-1000 plasma focus device at a current of 2 MA with the deuterium injected from the gas-puff placed in the axis of the anode face. The XUV frames showed, in contrast with the interferograms, the fine structure: filaments and spots up to 1mm diameter. In the deuterium filling, the short filaments are registered mainly in the region of the internal plasmoidal structures and their number correlates with the intensity of neutron production. The longer filamentary structure was recorded close to the anode after the constriction decay. The long curve-like filaments with spots were registered in the big bubble formed after the pinch phase in the head of the umbrella shape of the plasma sheath. Filaments can indicate the filamentary structure of the current in the pinch. Together with the filaments, small compact balls a few mm in diameter were registered by both interferometry and XUV frame pictures. They emerge out of the dense column and their life-time can be greater than hundreds of ns.

Influence of an external magnetic field on the dynamics of a modified plasma focus

  • DOI: 10.1088/0031-8949/2014/T161/014042
  • Odkaz: https://doi.org/10.1088/0031-8949/2014/T161/014042
  • Pracoviště: Katedra fyziky
  • Anotace:
    The stability of a plasma column and the evolution of discharges are strongly dependent on the axial magnetic field. Internal axial and radial components of the magnetic field are formed at high current discharges naturally, but they can be also produced artificially by auxiliary coils or permanent magnets. The PFZ-200 facility was modified for the experiments with an external axial magnetic field. On this facility, an anti-electrode was placed along the z-axis in front of the anode. The auxiliary coils or permanent magnets generating the axial magnetic field were placed inside the anode and anti-electrode. Using micro-channel plate diagnostics, the stability of the plasma column at an axial magnetic field was studied. At the discharges in deuterium gas, the neutron production and the generation of hard x-rays were diagnosed with the scintillation detectors.

Measurement of the Target Current and EMP on Terawatt Laser System PALS

  • Pracoviště: Katedra fyziky
  • Anotace:
    The experiments are performed at high-power photodissociation iodine laser (1.315 μm, E=<1 kJ, t = 400 ps, I=6x10E16 W/cm2) at thePALSResearchCenterinPrague.During interaction of a focused intensive laser pulse with a solid target fast electrons are escaping and the target becomes charged. This charge can be neutralized by current flowing throw the target holder to the ground. The current with large time derivation, which is related to the laser pulse shape and to the inductance of the grounding circuit, generates a electromagnetic pulse in radio or microwave frequency band. Because the interaction chamber is usually equipped by a glass windows, insulators for galvanic separation, cables and so on, the electromagnetic pulse (EMP) passes out from the interaction chamber. At high-power laser facilities the EMP disturbs electrical signals, causes incorrect work of diagnostics, computers or control equipment. The study of target currents and EMP is important for design of all diagnostic instruments and projects of the large laser systems.

Measurement of the target current by inductive probe during laser interaction on terawatt laser system PALS

  • DOI: 10.1063/1.4898016
  • Odkaz: https://doi.org/10.1063/1.4898016
  • Pracoviště: Katedra fyziky
  • Anotace:
    Measurements of the return-current flowing through a solid target irradiated with the sub-nanosecond kJ-class Prague Asterix Laser System is reported. A new inductive target probe was developed which allows us measuring the target current derivative in a kA/ns range. The dependences of the target current on the laser pulse energy for cooper, graphite, and polyethylene targets are reported. The experiment shows that the target current is proportional to the deposited laser energy and is strongly affected by the shot-to-shot fluctuations. The corresponding maximum target charge exceeded a value of 10 μC. A return-current dependence of the electromagnetic pulse produced by the laser-target interaction is presented.

Neutron production from puffing deuterium in plasma focus device

  • DOI: 10.1063/1.4892551
  • Odkaz: https://doi.org/10.1063/1.4892551
  • Pracoviště: Katedra fyziky
  • Anotace:
    The current research has continued on the PF-1000 plasma focus device at the current of 2 MA by comparison of the shots with and without injected deuterium. The increase of the total neutron yield at the level of 1010–1011 per shot was achieved after the compression of about 10 lg/cm of the deuterium from the gas-valve by about 46 lg/cm of the neon or deuterium plasma sheath. It increases five times at the decrease of the puffing deuterium mass to one-half. In shots with neon in the chamber and with puffing deuterium, a considerable decrease was confirmed of the soft X-ray emission in comparison with shots without deuterium injection. This decrease can be explained by the absence of the neon in the region of the compressed and hot plasma. The deuterium plasma from the gas-puff should then be confined in the internal structures both in the phase of implosion as well as during their formation and transformation. In shots with puffing deuterium, the evolution of instabilities in the plasma column was suppressed. The deuterium plasma has a higher conductance and better ability to form expressive and dense plasmoids and to transport the internal current in comparison with neon plasma. Neutrons were produced both at the initial phase of stagnation, as well as at a later time at the evolution of the constrictions and dense plasmoids. VC 2014 AIP Publishing LLC.

Study of the Fine Structure of the Plasma Current Sheath and Magnetic Fields in the Axial Region of the PF1000 Facility

  • Autoři: Mitrofanov, K., Krauz, V., prof. RNDr. Pavel Kubeš, CSc., Scholz, M., Paduch, M., Zielinska, E.
  • Publikace: Plasma Physics Reports. 2014, 40(40), 623-639. ISSN 1063-780X.
  • Rok: 2014
  • DOI: 10.1134/S1063780X14070071
  • Odkaz: https://doi.org/10.1134/S1063780X14070071
  • Pracoviště: Katedra fyziky
  • Anotace:
    Results of measurements of magnetic fields in the plasma pinching region during the compression of the deuterium plasma current sheath (PCS) at the PF1000 plasma focus facility are presented. The fine structure of the PCS (shock wave–magnetic piston) and its variations in the course of plasma compression toward the facility axis are studied using magnetic probes and laser interferometry. The radial distributions of the plasma density and current in the PCS are compared. It is shown that, in the shock wave region, the elec tron density of the compressed plasma is on the order of ~1018 cm–3, whereas the PCS current is almost entirely concentrated in the magnetic piston region—a plasma layer with an electron density of less than 1015 cm–3. Efficient transportation of the current by the PCS into the axial region of the facility in discharges with a high neutron yield (Yn > 1011 neutrons/shot) is detected. It is shown that the total neutron yield is well described by the dependence Yn ≈ (1.5–3) × 1010 , where Ip is the pinch current (in MA) flowing within the region r ≤ 13 mm.

Calculation of the inductance of plasma column at PF-1000 device with assumed current distribution

  • Pracoviště: Katedra fyziky
  • Anotace:
    Processed data is taken from the D−D fusion reaction experiments on PF-1000 at IFPILM Warsaw, operating with 2 MA, 1011 neutron yield, using interferometry, temporal resolved neutron diagnostics, magnetic probe diagnostics and X-ray diagnostics. The inductance is calculated under two different circumstances: with the known distribution function determined by the magnetic probe signal, and with the border of the plasma column determined from interferograms using Matlab. The inductance of the whole column is calculated using the formula for the inductance of a coaxial cylinder.

Characterization of neutron emission from mega-ampere deuterium gas puff Z-pinch at microsecond implosion times

  • DOI: 10.1088/0741-3335/55/8/085012
  • Odkaz: https://doi.org/10.1088/0741-3335/55/8/085012
  • Pracoviště: Katedra fyziky
  • Anotace:
    Experiments with deuterium (D-2) triple shell gas puffs were carried out on the GIT-12 generator at a 3 MA current level and microsecond implosion times. The influence of the mass of deuterium shells on neutron emission times, neutron yields and neutron energy spectra was studied.

Correlation of X-ray emission with interferometry and neutron diagnostics at tungsten anode face and deuterium filling in plasma-focus discharge

  • DOI: 10.1088/0741-3335/55/11/115005
  • Odkaz: https://doi.org/10.1088/0741-3335/55/11/115005
  • Pracoviště: Katedra fyziky
  • Anotace:
    In this paper, the influence of the tungsten evaporated from the anode on neutron production and soft X-ray radiation was studied on the base of X-ray, interferometry and neutron diagnostics performed on the plasma focus PF-1000 device with deuterium as the filling gas at the current of 2 MA and neutron yield above 1010. In the axial center of the anode face the copper circuit plate was substituted with a tungsten one. During the pinch, the tungsten ions evaporated from the anode were transported into the plasma column. The differences in the filters used in the MCP X-frames and PIN detectors enabled separation of the bremsstrahlung emitted by the deuterium plasma from the recombination radiation of the tungsten ions produced in the region of the plasma column near the anode at the time of the evolution of instabilities. In comparison with the copper anode face, the neutron yield decreased to 40 % and the energy of deuterons producing neutrons to 80%.

ESTIMATION OF AMOUNT OF SCATTERED NEUTRONS AT DEVICES PFZ AND GIT-12 BY MCNP SIMULATIONS

  • Pracoviště: Katedra fyziky
  • Anotace:
    Our work is dedicated to pinch effect occurring during current discharge in deuterium plasma, and our results are connected with two devices – plasma focus PFZ, situated in the Faculty of Electrical Engineering, CTU, Prague, and Z-pinch GIT-12, which is situated in the Institute of High Current Electronics, Tomsk. During fusion reactions that proceed in plasma during discharge, neutrons are produced. We use neutrons as instrument for plasma diagnostics. Despite of the advantage that neutrons do not interact with electric and magnetic fields inside device, they are inevitably scattered by materials that are placed between their source and probe, and information about plasma from which they come from is distorted. For estimation of rate of neutron scattering we use MCNP code.

Generation of Secondary Particles from Subnanosecond Laser Irradiation of Targets at Intensities of 10(16) W cm(-2)

  • DOI: 10.1109/TPS.2013.2254134
  • Odkaz: https://doi.org/10.1109/TPS.2013.2254134
  • Pracoviště: Katedra fyziky
  • Anotace:
    Emission of several tens of mA/cm(2) currents carried by MeV-protons is reported for plasmas produced by a beam of the 3-TW kJ-class Prague Asterix Laser System (PALS) focused onto foil targets of various thicknesses. The maximum proton energy of 4.2 MeV is observed at a modest irradiance (I lambda(2) similar to 2 x 10(16) W cm(-2) mu m(2)). According to the maximum ion energy scaling E-M similar to (I lambda(2))(0.4) found for picosecond lasers such a value should be reached at I lambda(2) similar to 3 x 10(18) W cm(-2) mu m(2). Enhancement of the maximum proton energy can be explained by nonlinear interaction of the PALS laser beam with the generated plasma. Nonlinear effects also result in enhancement in the yield of fusion neutrons from CD2 plasma. The obtained yield of 4 x 10(5) DD-neutrons per laser energy is comparable to those obtained by the use of ps- and fs-lasers irradiating targets with I lambda(2) similar to 10(19) W cm(-2) mu m(2).

Influence of the external magnetic field on the pinch evolution and neutron production in plasma-focus discharge

  • DOI: 10.1088/0741-3335/55/11/115013
  • Odkaz: https://doi.org/10.1088/0741-3335/55/11/115013
  • Pracoviště: Katedra fyziky
  • Anotace:
    In this paper, the results of the study of the influence of the applied external axial magnetic field on the dynamics of the pinch and neutron production are presented, following from the measurements using X-ray, interferometry and neutron diagnostics performed on the plasma focus PF-1000 device with deuterium as the filling gas at the current of 2 MA and neutron yield above 1010. The permanent magnets with a magnetic field of a few hundredths of tesla were used both inside the anode body and in front of the end of the dense column. This magnetic field decreases the neutron yield, depresses the implosion velocity and the velocity of the transformations of internal structures, stabilizes the pinch column, increases its axial symmetry and indirectly confirms the existence of internal closed currents inside the pinch structures.

Observation of repetitive bursts in emission of fast ions and neutrons in sub-nanosecond laser-solid experiments

  • DOI: 10.1017/S0263034613000360
  • Odkaz: https://doi.org/10.1017/S0263034613000360
  • Pracoviště: Katedra fyziky
  • Anotace:
    A massive deuterated polyethylene target was exposed to laser intensities of about 3 x 10(16) W/cm(2) employing the 3-TW Prague Asterix Laser System (PALS). We achieved a yield of 2 x 10(8) neutrons per laser shot. Average time-of-flight signals of scintillation detectors operated in current mode reveal broad energy spectra of fusion neutrons with dominating energy of about 2.45 MeV. The energy dependence of the neutron yield shows a consistency in results of nanosecond, picosecond and sub-picosecond experiments. Here we also show that ions emitted in the backward direction from the front target surface have a multi-peak energy spectrum, which is caused by burst emission mechanisms.

Plastic plasma interaction with plasmas with growing atomic number

  • DOI: 10.2478/s11534-013-0218-0
  • Odkaz: https://doi.org/10.2478/s11534-013-0218-0
  • Pracoviště: Katedra fyziky
  • Anotace:
    This paper describes the investigation of the influence of target material atomic number (Z) on the laser-produced plasma pressure. For this reason, several target materials representing a wide range of atomic numbers (Z = 3.5 - 73), i.e. plastic (CH), Al, Cu, Ag, and Ta, were used. The results presented show that the plasma pressure decreases with growing atomic number but in a limited range of Z only. For higher Z, starting approximately from Z = 47 (Ag), the plasma pressure becomes constant, as confirmed by interferometric measurements and x-ray plasma imaging.

Scenario of Pinch Evolution in a Plasma Focus Discharge

  • DOI: 10.1088/0741-3335/55/3/035011
  • Odkaz: https://doi.org/10.1088/0741-3335/55/3/035011
  • Pracoviště: Katedra fyziky
  • Anotace:
    In this paper, the possible evolution of the pinched plasma column is presented following from the results of the temporally resolved measurements using magnetic probe, interferometry and neutron diagnostics performed on the plasma focus PF-1000 device with deuterium as the filling gas. Together with the discharge axial current about 1.5 MA a toroidal current component of the order of 100 kA was estimated in the toroidal, helical, and plasmoidal structures formed within the dense plasma column. The mass inside these structures increases due to injection of the plasma from the neighborhood regions with a higher pinching pressure. This injected plasma increases the intensity of the internal magnetic field, probably through turbulent motion and magnetic dynamo effect. The neutrons from the D-D fusion reaction, produced during the formation and decay of plasmoidal structures and constrictions, are accompanied by the changes of the axial component of the magnetic field. Then, the transformation and decay of internal closed currents can contribute to the acceleration of high-energy electrons and ions.

Search for Drive Parameter of Neutron-Optimized Z-Pinches and Dense Plasma Foci

  • DOI: 10.1109/TPS.2013.2283890
  • Odkaz: https://doi.org/10.1109/TPS.2013.2283890
  • Pracoviště: Katedra fyziky
  • Anotace:
    Dense plasma foci and deuterium gas puff Z-pinches are studied as sources of fusion neutrons. To design a neutron-optimized plasma focus, the drive parameter has been discussed in the last 15 years. This optimal value can be explained by a tradeoff between the energy of fast deuterons and the number of fast and target deuterons. Obtained experimental results show that the optimal drive parameter cannot be fully explained without the consideration of ion acceleration mechanisms to fusion energies.

The Construction Of The Fast Resistive Bolometer For a SXR Measurement On The GIT-12 Facility

  • Pracoviště: Katedra fyziky
  • Anotace:
    A lot of kinds of instruments are used for the SXR measurement at pulsed power facilities, but most of them are difficult to calibrate absolutely. For the determination of the energy of SXR radiated by the discharge on Z-pinches, it is possible to use the bolometer which can be calibrated analytically. The bolometer can be constructed with the sufficient sensitivity and, at the same time, with the time resolution in the order of nanoseconds. This bolometer was designed and constructed for the measurement on the 5MA facility GIT-12 at the Institute of High Current Electronics (IHCE) of the Siberian Branch Russian Academy of Sciences in Tomsk. The experiments on GIT-12 with the neon and deuterium gas-puff load were diagnosed by the copper bolometer with the time resolution of 4 ns and the sensitivity of 12Vcm2 J−1.

Characterization of the Neutron Production in the Modified MA Plasma-Focus

Correlation of Magnetic Probe and Neutron Signals with Interferometry Figures on the Plasma Focus Discharge

  • DOI: 10.1088/0741-3335/12/105023+10$33.00
  • Odkaz: https://doi.org/10.1088/0741-3335/12/105023+10$33.00
  • Pracoviště: Katedra fyziky
  • Anotace:
    In this paper the results of temporally resolved measurements using calibrated azimuthal and axial magnetic probes are presented, together with interferometry and neutron diagnostics performed on the PF-1000 (IPPLM, Warsaw, 2 MA) device with a deuterium filling and 1011 neutron yield. The probes located in the anode front at three different radial positions allow determination of the dominant part of the discharge current flows behind the imploding dense plasma layer. The current sheath is composed of both the axial and azimuthal components of the magnetic field. After reaching the minimum diameter, the current sheath continues in a radial motion to the axis and then penetrates into the dense plasma column. At the final phase of stagnation, the dominant current passes through the dense column. The probes located at the axis of the anode front registered an increase and decrease 1n the pulse of the axial component of magnetic field in correlation with the formation and decay of the dense plasmoidal structure. The estimated values of the axial component of the magnetic field in the centre of the plasmoids in the first neutron pulse and close before its decay and dominant neutron production can reach 2 and 10 T, it is (10 - 30)% of the value of the azimuthal magnetic field of the dense column boundary.

Deuterium gas puff Z-pinch at currents of 2 to 3 mega-ampere

  • DOI: 10.1063/1.3696859
  • Odkaz: https://doi.org/10.1063/1.3696859
  • Pracoviště: Katedra fyziky
  • Anotace:
    Deuterium gas-puff experiments have been carried out on the GIT-12 generator at the Institute of High Current Electronics in Tomsk.

Distribution of the current during implosion and at pinch phase

  • Pracoviště: Katedra fyziky
  • Anotace:
    The plasma focus PF-1000 in the IPPLM in Warsaw, operating with 2 MA with 1011 neutron yield, was investigated with interferometry, x-ray and neutron diagnostics and magnetic probes. Also current, its derivative and voltage signals were obtained. During processed shots 9011 and 9013, the setting with anti-anode was used, making practically a Z-pinch type device from the PF-1000. The distance of the anti-anode was 3 cm [1]. Using interferometry, 16 interferometric pictures with millimeter spatial resolution were obtained, representing the distribution of plasma density. Their time step is 10-20 ns during a 220 ns period. Laser Nd:YLF with pulse duration below 1ns and a set of mirrors was used, splitting the main ray into 16 mutually delayed beams. Interferograms were processed with abelization and with developed applications into densitograms. Using magnetic probes [2], the temporal derivative of azimuthal magnetic field is registered at the anode front in radial distances of 4 and 1,3 cm which allows determination of the current density. Knowing the total current and velocity of passing current sheath we can estimate the radial distribution of the current. Further we presume that the distribution of the current is constant along the plasma column, which allows us to calculate the inductance of the plasma column and its time-derivative more accurately. The inductance is then compared with the calculation assuming that total current is passing the boundary of the dense plasma region, sinking in the plasma. This comparison will possibly give us means to calculate inductance from the changes of the dense plasma boundaries alone.

Energy Transformation in Column of Plasma Focus Discharges with Megaampere Currents

Experimental evidence of existence of the axial magnetic field in a plasma focus

  • Autoři: Krauz, V. I., Mitrofanov, K. N., Scholz, M., Paduch, M., prof. RNDr. Pavel Kubeš, CSc., Karpinski, L., Zielinska, E.
  • Publikace: Europhysics Letters. 2012, 98(4), 1-6. ISSN 0295-5075.
  • Rok: 2012
  • DOI: 10.1209/0295-5075/98/45001
  • Odkaz: https://doi.org/10.1209/0295-5075/98/45001
  • Pracoviště: Katedra fyziky
  • Anotace:
    The magnetic field distribution substantially affects mechanisms for the generation of radiation in Z-pinches. Investigation of the axial component of the magnetic field is one of the important problems in plasma focus studies. The measurements of the Bz-component of the magnetic field on the PF-1000 facility were done with the multichannel absolutely calibrated probe both at the stage of plasma-current sheath radial compression and in the dense-pinch stage. In the compression stage, the axial component of the magnetic field reaches several kG that comprises ~10% of the azimuthal component.

Experimental study of the structure of the plasma-current sheath on the PF-1000 facility

  • Autoři: Krauz, V., Mitrofanov, K., Scholz, M., Paduch, M., Karpinski, L., Zielinska, E., prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Plasma Physics and Controlled Fusion. 2012, 54(2), 1-14. ISSN 0741-3335.
  • Rok: 2012
  • DOI: 10.1088/0741-3335/54/2/025010
  • Odkaz: https://doi.org/10.1088/0741-3335/54/2/025010
  • Pracoviště: Katedra fyziky
  • Anotace:
    The measurements were performed using various modifications of the calibrated magnetic probes. Studies of the influence of the probe shape and dimensions on the measurements accuracy were done. The current flowing in the converging sheath at a distance of 40 mm from the axis of the facility electrodes was measured. In the optimal operating modes, this current is equal to the total discharge current, which indicates the high efficiency of current transportation toward the axis. In such shots a compact high-quality sheath forms with shock wave in front of the magnetic piston.

Improvement of time-of-flight methods for reconstruction of neutron energy spectra from D(d,n)3He fusion reactions

  • DOI: 10.1088/0741-3335/54/10/105011
  • Odkaz: https://doi.org/10.1088/0741-3335/54/10/105011
  • Pracoviště: Katedra fyziky
  • Anotace:
    This paper deals with time-of-flight diagnostics of relatively short neutron pulses from tens to hundreds of nanoseconds. The aim is to determine the time evolution of energy spectra. The diagnostic setup consists of several neutron detectors placed in one direction at different distances. This approach is improved by placing additional detectors in the opposite direction. How the reconstruction method works with two opposite directions is explained in this paper. Improvement is limited to the deuterium fusion reaction D(d,n)3He. However, the principles described here could be applied in various fusion experiments. The advantage of our approach is not only better reconstruction but also the partial elimination of the influence of scattered neutrons. The described method was applied in the processing of data from fusion experiments in the PF-1000 facility and provided time evolution of the neutron energy spectra with energy resolution of 50 keV. In these plasma-focus experiments, results indicated a non-thermal production mechanism of the predominant part of the neutrons produced.

Interferometry of the plasma focus equipped with forehead cathode

  • Pracoviště: Katedra fyziky
  • Anotace:
    The PF-1000 plasma-focus facility in Warsaw, equipped with Mather-type coaxial electrodes working with a deuterium filling, was modified by the addition of a cathode disk in front of the anode front-plate at a distance of 3 cm. The plasma was diagnosed with temporal resolved interferometry and neutron diagnostics. The modified electrode configuration showed an increase of the current in the pinch phase and a decrease of the total neutron yield. The lower total neutron yield is caused by a lower energy of deuterons producing the observed neutrons and by a decrease of the velocity of transformations of the structures in the pinch column.

Neutron Production From a Small Modified Plasma Focus Device

  • DOI: 10.1109/TPS.2012.2221167
  • Odkaz: https://doi.org/10.1109/TPS.2012.2221167
  • Pracoviště: Katedra fyziky
  • Anotace:
    Abstract-In this paper, the results are presented of the study of the pinch evolution in the modified small plasma-focus device at the current peak of 200 kA and with a deuterium filling. The disk conducting the cathode was placed 1 cm in front of the inner electrode (anode). The neutron yield reached 106-108 per shot. The evolution of the plasma was imaged with four pinhole XUV frames and two schlieren pictures. The neutron signals were registered with three scintillation detectors. The figures and signals were enabled to describe the pinch phase at the moment of hard X-ray and neutron production with a 2-ns temporal uncertainty. The results were similar to the results obtained on the PF-1000 at the current of 2 MA. The first neutron pulse is produced at the stagnation, and the dominant neutron production correlates with the disintegration of the dense plasma column. Additionally, the energies of fast neutrons and deuterons producing neutrons have similar values and distributions as in PF-1000.

Plastic plasma as a compressor of aluminum plasma at the PALS experiment

  • DOI: 10.1017/S0263034611000528
  • Odkaz: https://doi.org/10.1017/S0263034611000528
  • Pracoviště: Katedra fyziky
  • Anotace:
    In our earlier papers, we demonstrated that plasma pressure decreases with the growing atomic number of the target material. That experimentally confirmed fact brought about a question whether it would be possible to collimate the Al plasma outflow by using plastic plasma as a compressor. To prove that idea we used in our next experiments a plastic target with an Al cylindrical insert of 400 mu m in diameter. The measurements were carried out at the Prague Asterix Laser System iodine laser facility.

Progress in MJ plasma focus research at IPPLM

  • Autoři: Scholz, M., Karpinski, L., Krauz, V. I., prof. RNDr. Pavel Kubeš, CSc., Paduch, M., Sadowski, M. J.
  • Publikace: NUKLEONIKA. 2012, 57(2), 183-188. ISSN 0029-5922.
  • Rok: 2012
  • Pracoviště: Katedra fyziky
  • Anotace:
    The results of studies of the plasma dynamics and neutron emission on a PF-1000 facility in the stage of pinch formation are presented. The measurements were performed using various modifications of the calibrated magnetic probes, 16 frame interferometry, silver activation counters and photomultiplier tube (PMT) neutron probes. The current measurements at a distance of 40 mm from the axis of the electrodes was measured. This dependence agrees well with the known scaling, Yn ~ I4. The evolution of plasma density during pinch formation and a neutron emission were study.

Search for thermonuclear neutrons in a mega-ampere plasma focus

  • DOI: 10.1088/0741-3335/54/1/015001
  • Odkaz: https://doi.org/10.1088/0741-3335/54/1/015001
  • Pracoviště: Katedra fyziky
  • Anotace:
    Experimental results indicated a fraction of thermonuclear neutrons on the mega-ampere current level. Neutron TOF signals showed that the neutron production was a multiphase process and more than one mechanism occurred simultaneously. The occurrence of the thermonuclear mechanism was most evident during the plasma stagnation at low deuterium pressures. At low filling pressures, the narrow width of the neutron energy spectra demonstrated an ion temperature of about 1 keV. The possibility of thermonuclear neutrons was studied also after the stagnation, during the main neutron emission.

The SXR bolometer design for measurement on the power Z-pinches

  • Pracoviště: Katedra fyziky
  • Anotace:
    Design and construction of the high speed SXR pulse bolometer and experiments on the GIT-12 facility at Institute of High Current Electronics (IHCE SB RAN) in Tomsk.

Detemining the mean energy of neutrons and deuterons and determining of the proportion of slowed and delayed neutrons

  • Autoři: Hitschfel, J., prof. RNDr. Pavel Kubeš, CSc., Paduch, M., Zielinska, E.
  • Publikace: Towards Fusion Energy 2011. Warsaw: IPPLM, 2011. ISSN 2983-5884.
  • Rok: 2011
  • Pracoviště: Katedra fyziky
  • Anotace:
    Calculation of mean energy of neutrons and deuterons was done from the signals registered in axial and radial directions

Experimental evidence of thermonuclear neutrons in a modified plasma focus

  • DOI: 10.1063/1.3555447
  • Odkaz: https://doi.org/10.1063/1.3555447
  • Pracoviště: Katedra fyziky
  • Anotace:
    The PF-1000 plasma focus was modified by adding the cathode disk 3 cm in front of the anode. This modification facilitated the evaluation of neutron energy spectra. Two neutron pulses were distinguishable. As regards the first neutron pulse, it lasted 40 ns during the plasma stagnation and it demonstrated high isotropy of neutron emission. A peak neutron energy detected upstream was 2.46 MeV. The full width of neutron energy spectra of 90 enabled to calculate an ion temperature of 1.2 keV. These parameters and a neutron yield of 1e9 corresponded to theoretical predictions for thermonuclear neutrons.

Fusion neutron detector for time-of-flight measurements in z-pinch and plasma focus experiments

  • DOI: 10.1063/1.3559548
  • Odkaz: https://doi.org/10.1063/1.3559548
  • Pracoviště: Katedra fyziky
  • Anotace:
    We have developed and tested sensitive neutron detectors for neutron time-of-flight measurements in z-pinch and plasma focus experiments with neutron emission times in tens of nanoseconds and with neutron yields between 1e6 and 1e12 per one shot.

Interaction of a laser-produced copper plasma jet with ambient plastic plasma

  • DOI: 10.1088/0741-3335/53/9/095003
  • Odkaz: https://doi.org/10.1088/0741-3335/53/9/095003
  • Pracoviště: Katedra fyziky
  • Anotace:
    This work is aimed at the investigation of mutual interaction of plastic (CH) and copper axially symmetric plasmas, and the dependence on the ratio of their ablated masses.

Interaction of Cu and plastic plasmas as a method of forming laser produced Cu plasma streams with a narrow jet or pipe geometry

  • DOI: 10.1063/1.3579396
  • Odkaz: https://doi.org/10.1063/1.3579396
  • Pracoviště: Katedra fyziky
  • Anotace:
    The use of axially symmetrical target compositions consisting of materials with low and high atomic numbers makes it possible to create different plasma stream configurations (e.g., very narrow jet or pipe). In the paper certain their applications are suggested.

Interferometry of the Plasma Focus with Forehead Cathode

  • Pracoviště: Katedra fyziky
  • Anotace:
    Diagnostics of the fusion reaction with interferometry, x-ray and neutron techniques with temporal, spatial and energy resolution

Matlab applications for processing of interferograms and oscilograms from PF-1000 experiments

  • Pracoviště: Katedra fyziky
  • Anotace:
    This work presents development and usage of applications for processing and adjustments of data obtained during PF-1000 experiments in Warsaw

MCNP Calculations of the Spectrum of Scattered Neutrons at PFZ device

  • Pracoviště: Katedra fyziky
  • Anotace:
    Determination of the part of scaterd neutrons at the PFZ-device with calculation from signals of scintillation detectors using MCNP code

Measurements of Electron and Ion Beams Emitted From the PF-1000 Device in the Upstream and Downstream Direction

  • Autoři: Kwiatkowski, R., Skladnik-Sadowska, E., Malinowski, K., Sadowski, J. M., Czaus, K., Zebrowski, J., Karpinski, L., Paduch, M., Scholz, M., Garkusha, I., prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: NUKLEONIKA. 2011, 56(2), 119-123. ISSN 0029-5922.
  • Rok: 2011
  • Pracoviště: Katedra fyziky
  • Anotace:
    Characteristics of electron and ion beams emitted in the upstream and downstream direction along the z-axis of a large plasma focus device PF-1000

Mechanism of Production of Neutrons from D-D Reaction in PF and Z-pinch Discharges

  • Pracoviště: Katedra fyziky
  • Anotace:
    Results of neutron, hard X-ray, interferometry and magnetic probe diagnostics of the fusion DD reaction

Progress on MJ Plasma Focus Research at IPPLM

  • Autoři: Scholz, M., Sadowski, M., prof. RNDr. Pavel Kubeš, CSc., Krauz, V., Mitrofanov, K.
  • Publikace: International Conference on Research and Application of Plasmas Plasma 11. Warsaw: IPPLM, 2011. ISBN 978-83-926290-1-6.
  • Rok: 2011
  • Pracoviště: Katedra fyziky
  • Anotace:
    Diagnostics of the fusion plasma using x-ray, neutron and interferometry diagnostics in correlation with magnetic probes

Spontaneous Transformation in the Pinched Column of the Plasma Focus

The Noise Reduction of the Measured Signal in Plasma Diagnostics with Adaptive Filtration

  • Pracoviště: Katedra fyziky
  • Anotace:
    In the Wiener filtration the measured and reference signals are recorded in the channels of the osciloskops and the reference noise passes through the adaptive filter

Analysis of processes participating during intense iodine-laser-beam interactions with laser-produced plasmas

  • Autoři: Láska, L., Badziak, J., Jungwirth, K., Kálal, M., Krása, J., Krouský, E., prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Radiation Effects and Defects in Solids. 2010, 165(6-10), 463-471. ISSN 1042-0150.
  • Rok: 2010
  • DOI: 10.1080/10420151003718550
  • Odkaz: https://doi.org/10.1080/10420151003718550
  • Pracoviště: Katedra fyziky
  • Anotace:
    The high-power iodine laser PALS was used to generate highly charged Ta ions and to study non-linear processes in laser-produced plasma. Longitudinal structures of the expanding plasma, obtained by using an X-ray streak camera on a time scale ~2 ns, are presented. Various bright spots (moon-like, half-moonlike), expansion-path curvature and even their splitting were recorded. These phenomena are ascribed to the effect of the magnetic field that is self-generated at high laser intensities.

Application of a Bonner sphere spectrometer for determination of the energy spectra of neutrons generated by 1 MJ plasma focus

  • Pracoviště: Katedra fyziky
  • Anotace:
    The spectra of neutrons outside the plasma focus device PF-1000 with an upper energy limit of 1 MJ was measured using a Bonner spheres spectrometer in which the active detector of thermal neutrons was replaced by nine thermoluminescent chips. As an a priori spectrum for the unfolding procedure, the spectrum calculated by means of the Monte Carlo method with a simplified model of the discharge chamber was selected. Differences between unfolded and calculated spectra are discussed with respect to properties of the discharge vessel and the laboratory layout.

Arrangement of the Experimental Setup for Determination of Average Kinetic Energy of Reacting Deuterons in Fusion Z-pinch Experiments

  • Pracoviště: Katedra fyziky
  • Anotace:
    The kinetic energy of reacting deuterons is one of the important parameter of the fusion plasma where deuterium is presented in a load. The energy of deuterons is determined from the reconstructed neutron energy spectra which are obtained by extended time-of-flight (TOF) method where time-resolved neutron detectors are placed at several distances on two opposite directions from the neutron source. Provided that the deuteron energy is much smaller than the fusion Q-value, it is possible to show that the neutron energy is only a function of the component of the deuteron kinetic energy (and vice versa) in the direction of neutron detection. Consequently, the side-on and end-on energy components of deuterons can be found on the basis of TOF measurement of neutrons in the radial and axial directions. Finally, the average kinetic energy of reacting deuterons can be evaluated on an assumption of radial symmetry of neutron production from Z-pinch plasma.

Developing of High-Speed Electromagnetic Deuterium Valve for Gas-Puff in Z-Pinch

  • Pracoviště: Katedra fyziky
  • Anotace:
    Studies of the mechanism of neutron production in the D(d,n)3He reactions are the main purpose of our experiments. The gas-puff is the most effective load for Z-pinch discharges for neutron generation. The Gas-puff valves for experiments on the S-300 facility in RRC Kurchatov Institute in Moscow have developed since year 2007. Maximum current peak in the S-300 facility is 4 MA. Development of the electromagnetically triggered gas-puff valve began in October 2008. The main experiments with this electromagnetic valve were done in the RRC Kurchatov Institute Moscow in September and October 2009. There were done 11 shots with peak current of 2 MA with 100 ns rise time. The Z-pinch discharges in the gas-puff seems to be the way for achieve high neutron yields.

Discharges in Deuterium Gas-Puff

  • Pracoviště: Katedra fyziky
  • Anotace:
    Optimalization of the parameters of the electromagnetic valve for injection of the gas between electrodes

Efficient production of 100 keV deuterons in deuterium gas puff Z-pinches at 2MA current

  • DOI: 10.1088/0741-3335/52/6/065013
  • Odkaz: https://doi.org/10.1088/0741-3335/52/6/065013
  • Pracoviště: Katedra fyziky
  • Anotace:
    Deuterium gas puff experiments were carried out on the S-300 Z-pinch at the Kurchatov Institute in Moscow. Gas puffs imploded onto the axis before a current peak at about 100 ns. Fusion neutrons were generated after the gas puff implosion during global expansion of a plasma column. On the basis of experimental observations, we concluded that a total energy of deuterons accelerated to fusion energies was above 1.5 kJ. It is more than 15% of the energy input into a plasma. Therefore gas puff Z-pinches seem to be not only powerful sources of x-ray radiation but also efficient sources of 100 keV deuterons.

Experimental evidence of multimaterial jet formation with lasers

  • DOI: 10.1063/1.3511774
  • Odkaz: https://doi.org/10.1063/1.3511774
  • Pracoviště: Katedra fyziky
  • Anotace:
    Laser-produced multimaterial jets have been investigated at the Prague Asterix Laser System laser [ K. Jungwirth et al., Phys. Plasmas 8, 2495 (2001) ]. The method of jet production is based on the laser-plasma ablation process and proved to be easy to set up and robust. The possibility of multimaterial laboratory jet production is demonstrated and complex hydrodynamic flows in the jet body are obtained. Two complementary diagnostics in the optical ray and x-ray ranges provide detailed information about jet characteristics. The latter are in agreement with estimates and two-dimensional radiation hydrodynamic simulation results. The experiment provides a proof of principle that a velocity field could be produced and controlled in the jet body. It opens a possibility of astrophysical jet structure modeling in laboratory.

Fusion Plasma Diagnostics in the PF 1000 Device

  • Pracoviště: Katedra fyziky
  • Anotace:
    Detailed description of the neutron and X-ray diagnostic at the current level of 2 megaampers

Laboratory studies of multi-material radiative astrophysical jets propagation in plasmas

  • Autoři: Nicolai, P., Stenz, C., Tikhonchuk, V., Kasperczuk, A., Pisarczyk, T., Juha, L., Krousky, E., Masek, K., Pfeifer, M., Rohlena, K., Skala, J., Ullschmied, J., Kmetik, V., Kálal, M., prof. Ing. Daniel Klír, Ph.D., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc., Pisarczyk, P., Tabakhoff, E.
  • Publikace: Journal of Physics: Conference Series. 2010, 244(4), 042011/1-042011/4. ISSN 1742-6588.
  • Rok: 2010
  • DOI: 10.1088/1742-6569/244/4/042011
  • Odkaz: https://doi.org/10.1088/1742-6569/244/4/042011
  • Pracoviště: Katedra fyziky
  • Anotace:
    This work reports on results of a series of experiments dedicated to studying of plasma jets created by a simple method of matter ablation of multi-layer targets. The collimation and X-ray emission of multi-material jets strongly depend on the atomic number of materials and have been measured with two complementary diagnostics, in the optical and soft X-ray domains. A possibility of multi-material laboratory jet production scaled to astrophysical conditions is demonstrated.

Mechanism of Production of Neutrons from D-D Reaction in PF and Z-Pinch Discharges

  • Pracoviště: Katedra fyziky
  • Anotace:
    Scenario of acceleration of fast deuterons and generation of fusion neutrons using scintillation and interferometric diagnostics

Particles Transport Calculation Via the MCNP Code

  • Pracoviště: Katedra fyziky
  • Anotace:
    Calculation of the energy spectrum of neutrons influenced with geometry of external object located in the trace of radiation

Processing of Interferometric Data for Animated Display

  • Pracoviště: Katedra fyziky
  • Anotace:
    Interpolation of equidensity pictures with delay of 1 ns and their connection into one film

Research of D-D Fusion Reaction at the CTU in Prague

  • Pracoviště: Katedra fyziky
  • Anotace:
    Neutron and X-ray diagnostics at small plasma focus using anti-anode electrode configuration for application at PF-1000 facility

Transformation of the Pinched Column at a Period of the Neutron Production

  • DOI: 10.1109/TPS.2009.2036623
  • Odkaz: https://doi.org/10.1109/TPS.2009.2036623
  • Pracoviště: Katedra fyziky
  • Anotace:
    Interferometric diagnostics of the hot plasma generated by plasma focus at the2 MA current at the instant of neutron production from deutery fusion reacion

Determination of Deuteron Energy Distribution From Neutron Diagnostics in a Plasma-Focus Device

  • DOI: 10.1109/TPS.2008.2005899
  • Odkaz: https://doi.org/10.1109/TPS.2008.2005899
  • Pracoviště: Katedra matematiky, Katedra fyziky
  • Anotace:
    Fast neutrons from deuteron-deuteron fusion reactions were used for a study of fast deuterons in the PF-1000 plasma-focus device. The energy spectrum of neutrons was determined by the time-of-flight method using ten scintillation detectors positioned downstream, upstream, and side-on the experimental facility. Neutron energy-distribution functions enabled the determination of axial and radial components of energy of deuterons producing the fusion neutrons, as well as a rough evaluation of the total energy distribution of all fast deuterons in the pinch. It was found that the total deuteron energy-distribution function decreases with the deuteron energy more slowly than the tail of the Maxwellian distribution for 1-2-keV deuterons.

Deuteron Acceleration and Fusion Neutron Production in Z-pinch plasmas

  • Pracoviště: Katedra fyziky
  • Anotace:
    Fusion neutron measurements were carried out on the S-300 generator (Kurchatov Institute, Moscow). We tried deuterated fibers, various types of wire arrays imploding onto a deuterated fiber, and deuterium gas puffs as Z-pinch loads. On the current level of 2 MA, the peak neutron yield of 1010 was achieved with a deuterium gas-puff. The neutron and deuteron energy spectra were quite similar in various types of Z-pinch configurations. The broad width of radial neutron spectra implied a high radial component of deuteron velocity. On the basis of neutron measurements, we concluded that neutron production mechanism is connected with the study of plasma voltage. It means that the acceleration of fast deuterons is not a secondary process but it reflects the global dynamics of Z-pinch plasmas. For this reason it is useful to add deuterium as a "tracer" in Z-pinch loads more often. For instance, it seems attractive to prepare wire-arrays from deuterated metal wires such as Pd.

Interferometric Study of Pinch Phase in Plasma-Focus Discharge at the Time of Neutron Production

Investigations of plasma jet interaction with ambient gases by multi-frame interferometric and X-ray pinhole camera systems

  • DOI: 10.1017/S0263034609000172
  • Odkaz: https://doi.org/10.1017/S0263034609000172
  • Pracoviště: Katedra fyziky
  • Anotace:
    Interactions of laser driven plasma jets with He and Ar gas puffs was investigated experimentally by means of three-frame interferometric/shadowgraphic system and three-frame X-ray pinhole camera. A defocused iodine laser beam using the Prague Asterix Laser System (PALS) interacting with massive planar Cu targets generated high-speed well-collimated plasma jets. The PALS third harmonic (0.438 mu m), with pulse duration of 250 ps (full width at half maximum), and energy of 100 J was employed in two irradiation geometries: with an incidence normal to the target surface and with an oblique one (30 with respect to the target normal), in order to minimize the heating of the ambient gas by the laser beam. The results of these interaction experiments, in particular, those obtained in case of the oblique incidence geometry, are presented and discussed. They show the effect of the double shock formation in ambient gases: starting by the ablative plasma action, followed by that of the jet.

Investigations of plasma jet interaction with ambient gases by the multi-frame interferometric and x-ray pinhole camera systems

  • Autoři: Kasperczuk, A., Pisarczyk, T., Nicolai, Ph., Stenz, Ch., Tikhonchuk, V., Kálal, M., Ullschmied, J., prof. Ing. Daniel Klír, Ph.D., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Proceedings of the XXX ECLIM. Darmstadt: Technische Universität, 2009. pp. 8-9. TUD-2009 REPORT.
  • Rok: 2009
  • Pracoviště: Katedra fyziky
  • Anotace:
    The interaction of laser driven jets with He and Ar gas puffs was investigated experimentally by means of the three-frame interferometric system and the four-frame x-ray pinhole camera. High speed well-collimated plasma jets were generated by a defocused PALS (Prague Asterix Laser System) iodine laser beam interacting with massive planar Cu targets. The PALS third harmonic (0.438 um) with a pulse duration of 250 ps (full width at half-maximum) and an energy of 100 J was employed in two irradiation geometries: with an incidence normal to the target surface and with an oblique one (30 degrees with respect to the target normal). The results of these interaction experiments, in particular those obtained in case of the oblique incidence geometry (employed to minimize the heating laser beam influence on these ambient gases), are presented and discussed. They show the effect of the double shock formation in ambient gases due to the ablative plasma and next the jet actions.

Neutron Energy Distribution Function Reconstructed From Time-of-Flight Signals in Deuterium Gas-Puff Z-Pinch

  • DOI: 10.1109/TPS.2008.2010860
  • Odkaz: https://doi.org/10.1109/TPS.2008.2010860
  • Pracoviště: Katedra fyziky
  • Anotace:
    The implosion of a solid deuterium gas-puff Z-pinch was studied on the S-300 pulsed power generator. The peak neutron yield above 1E10 was achieved on the current level of 2 MA. The fusion neutrons were generated at about 150 ns after the current onset, i.e., during the stagnation and at the beginning of the expansion of a plasma column. The neutron emission lasted on average 25 ns. The neutron energy distribution function was reconstructed from 12 neutron TOF signals by the Monte Carlo simulation. The side-on neutron energy spectra peaked at 2.42 +/- 0.04 MeV with about 450-keV FWHM. In the downstream direction (i.e., the direction of the current flow from the anode toward the cathode), the peak neutron energy and the width of a neutron spectrum were 2.6 +/- 0.1 MeV and 400 keV, respectively. The average kinetic energy of fast deuterons, which produced fusion neutrons, was about 100 keV. The generalized beam-target model probably fits best to the obtained experimental data.

Neutron Production and Fast Deuteron Characteristics at the Plasma Focus Discharge

  • Pracoviště: Katedra fyziky
  • Anotace:
    This paper summarized the results of interferometry, X-ray and neutron diagnostics performed at the plasma focus facility filled with deuterium. The fusion processes are produced mainly in the dense and hot spherical structure of 2 cm diameter 5 - 8 cm in front of the anode. The electron temperature of this structure is about 750 eV and the density 5x10^24 - 5x10^25. The neutron energy distribution was calculated using time of flight analysis and showed the dominant direction of the fast deuteron velocity downstream. The deuteron energy distribution was estimated supposing isotropy distribution of the sum of opposite orientation. The total number of fast deuterons in the energy range of 10-400 keV is about 10^18 with total energy of 20 kJ. Plasma in the spherical structure is heated dominantly with ion-ion Coulomb collisions of fast deuterons in the energy range below 10 keV.

Neutron Production at the Small Plasma-Focus Device With Antianode

Reconstruction of Time-Resolved Neutron Energy Spectra in Z-Pinch Experiments Using time-of-flight Method

  • Pracoviště: Katedra fyziky
  • Anotace:
    We present the reconstruction of neutron energy spectra from time-of-flight signals. This technique is useful in experiments with the time of neutron production in the range of about tens or hundreds of nanoseconds. The neutron signals were obtained by a common hard X-ray and neutron fast plastic scintillation detectors. The reconstruction is based on the Monte Carlo method which has been improved by simultaneous usage of neutron detectors placed on two opposite sides from the neutron source. Although the reconstruction from detectors placed on two opposite sides is more difficult and a little bit inaccurate (it followed from several presumptions during the inclusion of both sides of detection), there are some advantages. The most important advantage is smaller influence of scattered neutrons on the reconstruction. Finally, we describe the estimation of the error of this reconstruction.

Research of the Small Plasma Focus with an Auxiliary Electrode at Deuterium Filling

Study of D-D Fusion Reaction at Z-pinch Devices in 2009

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., prof. Ing. Daniel Klír, Ph.D., Ing. Karel Řezáč, Ph.D., Paduch, M., Pisarzcyk, T., Scholz, M., Ivanova-Stanik, I., Chodukowski, T., Karpinski, L., Sadowski, M.J, Tomaszewski, K., Zielinska, E., Bakshaev, Yu, Chernenko, A., Kazakov, E., Korolev, V., Ananev, S., Zelenin, A., Ustroev, G.
  • Publikace: Proceedings of the Workshop and Expert Meeting ICDMP. Warsaw: IPPLM, 2009. pp. 1-44.
  • Rok: 2009
  • Pracoviště: Katedra fyziky
  • Anotace:
    Results of interferometry and x-ray diagnostics are used for description of the plasma transformation during neutron production

Supersonic plasma jet interaction with gases and plasmas

  • Autoři: Nicolai, P., Stenz, C., Tikhonchuk, V., Ribeyre, X., Kasperczuk, A., Pisarczyk, T., Juha, L., Krousky, E., Masek, K., Pfeifer, M., Rohlena, K., Skala, J., Ullschmied, J., Kálal, M., prof. Ing. Daniel Klír, Ph.D., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc., Pisarczyk, P.
  • Publikace: Astrophysics and Space Science. 2009, 322(1-4), 11-17. ISSN 0004-640X.
  • Rok: 2009
  • DOI: 10.1007/s10509-008-9939-8
  • Odkaz: https://doi.org/10.1007/s10509-008-9939-8
  • Pracoviště: Katedra fyziky
  • Anotace:
    The interaction of supersonic plasma jets with dense gases and plasmas has been studied experimentally and theoretically. Collimated plasma jets were generated from the laser pulse interaction with solid targets. The jet propagates with the velocity exceeding 400 km/s and transports the energy of a few kJ/cm2. The interaction of such a jet with an Ar and He gases at various pressures has been studied by using optical and X-ray diagnostics. Qualitative estimates and numerical simulations with a radiative hydrodynamic code explain a sequence of physical processes during the interaction. Experimental and numerical results show that, by changing ambient material, the working surface structure changes from an adiabatic outflow to a radiative cooling jet. The applications of this phenomenon to astrophysical conditions and the inertial confinement fusion are discussed.

Anisotropy of the emission of DD-fusion neutrons caused by the plasma-focus vessel

  • Pracoviště: Katedra fyziky
  • Anotace:
    The anisotropic emission of DD-fusion neutrons emitted by the plasma focus device PF-1000 at the Institute of Plasma Physics and Laser Microfusion, Warsaw, was observed with the use of thermoluminescent dosimeters and fast-neutron moderators. The observed anisotropy is compared with the computational prediction of the anisotropy caused by the PF-1000 vessel, which scatters the expanding DD-neutrons. The resulting changes in the group energy spectrum of neutrons induced by their scattering on the discharge vessel are presented and their effect on time-of-flight spectra of neutrons is discussed.

Another Enlargment of the Program Neutrons for Reconstruction of the Neutron Energy Spectra in D-D Z-pinch Experiments

  • Pracoviště: Katedra fyziky
  • Anotace:
    Program Neutrons for Reconstruction of the Neutron Energy Spectra in D-D Z-pinch Experiments on the base of Monte-Carlo simulations

Dense Z-Pinches 2008

  • Pracoviště: Katedra fyziky
  • Anotace:
    Presentation of results from conference showes new experimental, simulation, theoretical and diagnostic knowledge

Deuterium Gas-Puff Z-Pinch at the Kurchatov Institute

  • Pracoviště: Katedra fyziky
  • Anotace:
    Results of neutron diagnostics from S-300 Z-Pinch at the Kurchatov Institute

Fusion D-D reaction at the PF-1000 in Frame of ICDMP

  • Pracoviště: Katedra fyziky
  • Anotace:
    Fusion D-D reaction at the PF-1000 in Frame of ICDMP was studied with x-ray, neutron and interferometric diagnostics

Laboratory modeling of supersonic radiative jets propagation in plasmas and their scaling to astrophysical conditions

  • Autoři: Tikhonchuk, V.T., Nicolai, Ph., Ribeyre, X., Stenz, C., Schurtz, G., Kasperczuk, A., Pisarczyk, T., Juha, L., Krousky, E., Masek, K., Pfeifer, M., Rohlena, K., Skala, J., Ullschmied, J., Kálal, M., prof. Ing. Daniel Klír, Ph.D., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc., Pisarczyk, P.
  • Publikace: Plasma Physics and Controlled Fusion. 2008, 50(12), 124056-124066. ISSN 0741-3335.
  • Rok: 2008
  • DOI: 10.1088/0741-3335/50/12/124056
  • Odkaz: https://doi.org/10.1088/0741-3335/50/12/124056
  • Pracoviště: Katedra fyziky
  • Anotace:
    Supersonic jets propagation over considerable distances and their interactions with surrounding media is one of important subjects in astrophysics. Laboratory-created jets have completely different scales, however, typical velocities are the same, and the similarity criteria can be applied to scale them to astrophysical conditions. Moreover, by choosing appropriate pairs of colliding plasmas, one can fulfill the scaling conditions for the radiation emission rates. In this paper we present the results of studies of interaction of laser-created jets with a gas-puff plasmas at the PALS laser facility. By varying the gas pressure and composition, the nature of interaction zone changes from a quasi-adiabatic outflow to a strongly radiation cooling jet. The fine scale structures of the interaction zone are studied by means of optical and x-ray diagnostics, and they are interpreted with a semi-analytical model and 2D radiation hydrodynamic simulations.

Mechanism of Production of Neutrons from D-D Reaction in Z-pinch Discharges

  • Pracoviště: Katedra fyziky
  • Anotace:
    Results of x-ray, neutron and interferometry diagnostics of D-D fusion reactions are base for determination of mechanism of fast ion acceleration

Neutron emission during the implosion of a wire array onto a deuterated fiber

  • Pracoviště: Katedra fyziky
  • Anotace:
    X-ray and neutron diagnostics of the radiation during the implosion of a wire array onto a deuterated fiber

Neutron emission generated during wire array Z-pinch implosion onto deuterated fiber

  • Pracoviště: Katedra fyziky
  • Anotace:
    Neutron and soft X-ray diagnostics of the emission generated during wire array Z-pinch implosion onto deuterated fiber

Research on the PF-1000 in 2008

  • Pracoviště: Katedra fyziky
  • Anotace:
    In the report the results of x-ray, neutron and interferometry diagnostics important for understanding of mechanism of acceleration of fast energy ions were presented

Studies of supersonic radiative plasma jet interaction with gases at the Prague Asterix Laser System (PALS) facility

  • Autoři: Nicolai, Ph., Stenz, C., Tikhonchuk, V., Ribeyre, X., Kasperczuk, A., Pisarczyk, T., Juha, L., Krousky, E., Masek, K., Pfeifer, M., Rohlena, K., Skala, J., Ullschmied, J., Kálal, M., prof. Ing. Daniel Klír, Ph.D., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc., Pisarczyk, P., Schurtz, G., Galera, S., Schlegel, T.
  • Publikace: PHYSICS OF PLASMAS. 2008, 15(8), 082701-082718. ISSN 1070-664X.
  • Rok: 2008
  • DOI: 10.1063/1.2963083
  • Odkaz: https://doi.org/10.1063/1.2963083
  • Pracoviště: Katedra fyziky
  • Anotace:
    The interaction of supersonic plasma jets with dense gases and plasmas has been studies experimentally and theoretically. Collimated plasma jets were generated from the laser pulse interaction with solid targets. The jet propagates with the velocity exceeding 400 km/s and transports the energy of a few kJ per cm square.

Time Resolved Neutron Energy Spectra Reconstruction from One Chain of TOF Detectors: Possibilities and Limitations

  • Pracoviště: Katedra fyziky
  • Anotace:
    Temporal resolution of energy spectra of fusion neutrons were calculated on the base of time-of-flight method and Monte Carlo simulations

Wire-Array Z-Pinch Implosion onto Deuterated Fibre at S-300 Generator

  • Pracoviště: Katedra fyziky
  • Anotace:
    Wire-Array Z-Pinch Implosion onto Deuterated Fibre at S-300 Generator enabled generation of fusion neutrons from D-D fusion reaction

D-D fusion neutrons generated in 500 J fibre Z-pinch

  • Pracoviště: Katedra fyziky
  • Anotace:
    Z-pinch, D-D fusion reaction, neutrons, plasma diagnostics

D-D reaction and fast deuterons in plasma focus facility

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., prof. Ing. Daniel Klír, Ph.D., Kravárik, J., Ing. Karel Řezáč, Ph.D., Bienkowska, B., Ivanova-Stanik, I., Karpinski, L., Paduch, M., Scholz, M., Schmidt, H., Sadowski, M., Tomaszewski, K.
  • Publikace: Proceedings of XXVIII International Conference on Phenomena in Ionized Gases. Prague: Institute of Plasma Physics AS CR, v.v.i., 2007. pp. 1473-1475. ISBN 978-80-87026-01-4.
  • Rok: 2007
  • Pracoviště: Katedra fyziky
  • Anotace:
    Study of D-D reaction and fast deuterons in plasma focus facility

Fast Deuterons and Neutrons in Plasma Focus Discharge

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., prof. Ing. Daniel Klír, Ph.D., Kravárik, J., Ing. Karel Řezáč, Ph.D., Litseva, E., Bienkowska, B., Tomaszewski, K., Karpinski, L., Ivanova-Stanik, I., Paduch, M., Scholz, M., Schmidt, H., Sadowski, M.J.
  • Publikace: 34thEPS Conference on Plasma Physics, 2 - 6 July 2007 Europhysics Conference Abstracts Vol. 31I (2007). Frankfurt: European Physical Society, 2007. pp. 1-4. ISBN 978-83-926290-0-9.
  • Rok: 2007

Fusion Neutrons Produced in Wire-Array Z-Pinch at S-300 Facility

  • Autoři: prof. Ing. Daniel Klír, Ph.D., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc., Ing. Karel Řezáč, Ph.D., Ananev, S.S., Bakshaev, Yu.L., Blinov, P.I., Chernenko, A.S., Kazakov, E.D., Korolev, V.D., Meshcherov, B.R., Ustroev, G.I.
  • Publikace: 34thEPS Conference on Plasma Physics, 2 - 6 July 2007 Europhysics Conference Abstracts Vol. 31I (2007). Frankfurt: European Physical Society, 2007. pp. 1-4. ISBN 978-83-926290-0-9.
  • Rok: 2007

Generation of Neutrons from D-D Fusion Reactions at CTU

  • Pracoviště: Katedra fyziky
  • Anotace:
    Generation of Neutrons from D-D Fusion Reactions at CTU

Historie Katedry Fyziky FEL ČVUT

  • Pracoviště: Katedra fyziky
  • Anotace:
    Článek popisuje historii Katedry Fyziky FEL ČVUT od počátku jejího vzniku dosud.

Perspektivy energetických zdrojů

  • Pracoviště: Katedra fyziky
  • Anotace:
    Perspektivy energetických zdrojů

Reconstruction of D-D Neutron Energy Spectra from Time-Resolved Neutron Detectors Placed in Opposite Directions

  • Pracoviště: Katedra fyziky
  • Anotace:
    plasma diagnostics, D-D fusion neutrons, Monte Carlo reconstruction

Silnoproudé výboje na katedře fyziky

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J.
  • Publikace: Československý časopis pro fyziku. 2007, 57(3), 152-157. ISSN 0009-0700.
  • Rok: 2007
  • Pracoviště: Katedra fyziky
  • Anotace:
    Silnoproudé výboje na katedře fyziky

Spatial distribution of DD-fusion neutron emission from a plasma focus measured with thermoluminescent dosimeters

  • Autoři: Velyhan, A., Bienkowska, B., Ivanova-Stanik, I., Juha, L., Karpinski, L., prof. Ing. Daniel Klír, Ph.D., Králík, M., Krása, J., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc., Miklaszewski, R., Paduch, M., Schmidt, H., Scholz, M., Šolc, J., Tomaszewski, K.
  • Publikace: 34thEPS Conference on Plasma Physics, 2 - 6 July 2007 Europhysics Conference Abstracts Vol. 31I (2007). Frankfurt: European Physical Society, 2007. pp. 1-4. ISBN 978-83-926290-0-9.
  • Rok: 2007

Study of Axial Anisotropy of Neutron Yield in the Reconstruction of Neutron Energy Spectra in D-D Reaction

Study of Fusion Neutrons at PF-1000 in Frame ICDMP

  • Pracoviště: Katedra fyziky
  • Anotace:
    Study of Fusion Neutrons at PF-1000 in Frame ICDMP

The Influence of an Intense Laser Beam Interaction with Preformed Plasma on the Characteristics of Emitted Ion Streams

  • Autoři: Laska, L., Badziak, J., Gammino, S., Jungwirth, K., Kasperczuk, A., Krasa, J., Krousky, E., prof. RNDr. Pavel Kubeš, CSc., Parys, P., Pfeifer, M.
  • Publikace: Laser and Particle Beams. 2007, 25(4), 549-556. ISSN 0263-0346.
  • Rok: 2007
  • Pracoviště: Katedra fyziky
  • Anotace:
    Intense laser-beam interactions with preformed plasma, preceding the laser-target interactions, significantly influence both the ion and X-ray generation. It is due to the laser pulse (its total length, the shape of the front edge, its background, the contrast, the radial homogeneity) as well as plasma (density, temperature) properties. Generation of the super fast (FF) ion groups is connected with a presence of non-linear processes. Saturated maximum of the charge states (independently on the laser intensity) is ascribed to the constant limit radius of the self-focused laser beam. Its longitudinal structure is considered as a possible explanation for the course of some experimental dependencies obtained.

Time Resolving Study of D-D Reaction at the Plasma Focus Device

  • Pracoviště: Katedra fyziky
  • Anotace:
    TIME RESOLVING STUDY OF D-D REACTION AT THE PLASMA FOCUS DEVICE

Time-resolved Energy Neutron Spectra in D-D Fusion Reactions

  • Pracoviště: Katedra fyziky
  • Anotace:
    Time-resolved Energy Neutron Spectra in D-D Fusion Reactions

Application of Intense Plasma-Ion Streams Emitted from Powerful PF-Type Discharges for Material Engineering

  • Autoři: Sadowski, M.J., Gribkov, V.A., prof. RNDr. Pavel Kubeš, CSc., Malinowski, K., Skladnik-Sadowská, E., Scholz, M., Tsarenko, A., Zebrowski, J.
  • Publikace: Physica Scripta. 2006, T123(T123), 66-78. ISSN 0031-8949.
  • Rok: 2006
  • Pracoviště: Katedra fyziky
  • Anotace:
    Plasma diagnostics of the plasma which accelerated fast energy ions in the energy range ot tens and hundreds kilolectronvolts

Comprehensive Diagnostics at the S-300 Z-pinch Generator

  • Autoři: prof. Ing. Daniel Klír, Ph.D., prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Bakshaev, Yu.L., Blinov, P.I., Chernenko, A.S., Danko, S.A., Korolev, V.D., Korelskij, A.V., Kravchenko, E.V., Shaskov, A.Yu., Ustroev, G.I., Ivanov, M.I.
  • Publikace: Proceedings of Workshop 2006. Praha: České vysoké učení technické v Praze, 2006. pp. 52-53. ISBN 80-01-03439-9.
  • Rok: 2006
  • Pracoviště: Katedra fyziky
  • Anotace:
    Comprehensive Diagnostics at the S-300 Z-pinch Generator

Correlation of Radiation and Electron and Neutron Signals at PF-1000

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Barvíř, P., prof. Ing. Daniel Klír, Ph.D., Scholz, M., Paduch, M., Tomaszewski, K., Ivanova-Stanik, I., Bienkowska, B., Karpinski, L., Sadowski, M.J., Schmidt, H.
  • Publikace: Plasma 2005. Melville, New York: American Institute of Physics, 2006. p. 233-236. ISSN 0094-243X. ISBN 0-7354-0304-X.
  • Rok: 2006
  • Pracoviště: Katedra fyziky
  • Anotace:
    Correlation of Radiation and Electron and Neutron Signals at PF-1000

Correlation of Radiation with Electron and Neutron Signals Taken in a Plasma-Focus Device

  • Pracoviště: Katedra fyziky
  • Anotace:
    Correlation of Radiation with Electron and Neutron Signals Taken in a Plasma-Focus Device

Deuterated Fibre Z-Pinch on the S-300 Generator

Development of Current Channels in Discharges at Atmospheric Pressure

  • Autoři: Barvíř, P., prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Scholz, M., Karpinski, L., Skladnik-Sadowska, E., Malinowski, K.
  • Publikace: Physica Scripta. 2006, T123(T123), 120-123. ISSN 0031-8949.
  • Rok: 2006

Evolution of the Current Channel of the High Energy Discharge at Atmospheric Pressure

  • Autoři: Barvíř, P., prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Scholz, M., Karpinski, L., Skladnik-Sadowska, E., Malinowski, K.
  • Publikace: Journal de Physique IV. 2006, 133(6), 767-769. ISSN 1155-4339.
  • Rok: 2006
  • Pracoviště: Katedra fyziky
  • Anotace:
    Experiments with high energy laboratory discharge

Experimental Studies of Interaction of Intense Long Laser Pulse with a Laser-Created Ta Plasma

  • Autoři: Láska, L., Jungwirth, K., Krása, J., Krouský, E., Pfeifer, M., Rohlena, K., Skála, J., Ullschmied, J., Velyhan, A., prof. RNDr. Pavel Kubeš, CSc., Badziak, J., Parys, P., Rosinski, M., Ryc, L., Wolowski, J.
  • Publikace: Czechoslovak Journal of Physics. 2006, 56B(56B), 506-514. ISSN 0011-4626.
  • Rok: 2006

General Characteristics of Fusion-Neutron Emission from Megajoule Plasma-Focus Facility

  • Autoři: Scholz, M., Bienkowska, B., Ivanova-Stanik, I., Karpinski, L., Paduch, M., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc., Sadowski, M.J., Szydlowski, A., Schmidt, H., Zielinska, E.
  • Publikace: Czechoslovak Journal of Physics. 2006, 56B(56B), 243-249. ISSN 0011-4626.
  • Rok: 2006
  • Pracoviště: Katedra fyziky
  • Anotace:
    Neutron diagnostics of fusion plasma with soft x-ray temporal and spatial resolution and scintillation detectors

Generation of D-D Fusion Neutrons

Generation of Fusion Neutrons in Various Z-pinch Configurations

Imploding Z-Pinch Plasma Formed from a Carbon Fibre

  • Pracoviště: Katedra fyziky
  • Anotace:
    Imploding Z-Pinch Plasma Formed from a Carbon Fibre

Improvement of Methods Used for Reconstruction of Time Resolved Neutron Energy Spectra in D-D Fusion Reactions

Investigation of Fusion-Reaction Protons from PF-Discharges

  • Autoři: Malinowska, A., Szydlowski, A., Malinowski, K., Sadowski, M.J., Schloz, M., Paduch, M., Ivanova-Stanik, I., prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Czechoslovak Journal of Physics. 2006, 56B(56B), 303-308. ISSN 0011-4626.
  • Rok: 2006
  • Pracoviště: Katedra fyziky
  • Anotace:
    We performed plasma focus experiments with comprehensive proton and neutron diagnostics. Neutron time of flight diagnostics was enabled by a large number of scintillators and photomultipliers.

Measurement of High Energy Electrons at PF-1000

  • Pracoviště: Katedra fyziky
  • Anotace:
    Measurement of High Energy Electrons at PF-1000

Measurement of Spatial Distribution of D-D Fusion Neutron Emission with the Use of Thermoluminisceht Dosimeters

  • Autoři: Krása, J., Velyhan, A., Bienkowska, B., Ivanova-Stanik, I.M., Juha, L., Karpinski, L., prof. Ing. Daniel Klír, Ph.D., Králík, M., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc., Paduch, M., Schmidt, H., Scholz, M., Tomaszewski, K.
  • Publikace: 33rd EPS Conference on Plasma Physics. Frascati: European Physical Society, 2006. p. 301P50351-301P50354. ISBN 2-914771-40-1.
  • Rok: 2006
  • Pracoviště: Katedra fyziky
  • Anotace:
    Measurement of Spatial Distribution of D-D Fusion Neutron Emission with the Use of Thermoluminisceht Dosimeters

Measurements of D-D neutrons in Z-Pinches

Monte Carlo Simulations for Reconstruction of Neutron Time-Resolving Energy Distribution in D-D Fusion Reactions

Neutron Emission Characteristics of Pinched Dense Magnetized Plasmas

  • Autoři: Schmidt, H., prof. RNDr. Pavel Kubeš, CSc., Sadowski, J.M., Scholz, M.
  • Publikace: IEEE Transactions on Plasma Science. 2006, 34(5), 2363-2367. ISSN 0093-3813.
  • Rok: 2006
  • Pracoviště: Katedra fyziky
  • Anotace:
    Neutron Emission Characteristics of Pinched Dense Magnetized Plasmas

Neutron Emission of Z-Pinch Discharges

  • Pracoviště: Katedra fyziky
  • Anotace:
    Neutron Emission of Z-Pinch Discharges

Neutron Energy Spectra at PF-1000

  • Pracoviště: Katedra fyziky
  • Anotace:
    Neutron Energy Spectra at PF-1000

Recent Results of the Filippov-Type PF Experiments Performed at Kurchatov Institute

  • Autoři: Krauz, V.I., Karakin, N.A., Khautiev, E.Yu., Mokeev, A.N., Myalton, V.V., Smirnov, V.P., Vinigradov, V.P., Fortov, V.E., Nikulin, V.Ya., Oginov, A.V., Volobuev, I.V., prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Plasma 2005. Melville, New York: American Institute of Physics, 2006. p. 43-50. ISSN 0094-243X. ISBN 0-7354-0304-X.
  • Rok: 2006
  • Pracoviště: Katedra fyziky
  • Anotace:
    Recent Results of the Filippov-Type PF Experiments Performed at Kurchatov Institute

Status of a Mega-Joule Scale Plasma-Focus Experiments

  • Autoři: Scholz, M., Bienkowska, B., Borowiecki, B., Ivanova-Stanik, I., Karpinski, L., Stepnewski, W., Paduch, M., Tomaszewski, K., prof. RNDr. Pavel Kubeš, CSc., Kravárik, J.
  • Publikace: Nucleonika, The International Journal of Nuclear Research. 2006, 51(1), 79-84. ISSN 0029-5922.
  • Rok: 2006
  • Pracoviště: Katedra fyziky
  • Anotace:
    This paper presents results of the recent plasma-focus (PF) experiments carried out with PF facilities, which was operated at energies ranging from 0.5 MJ to about 1 MJ.

Study DD- Neutrons in the Experiments on S-300 Pulsed Power Machine

  • Pracoviště: Katedra fyziky
  • Anotace:
    Study DD- Neutrons in the Experiments on S-300 Pulsed Power Machine

Study of Neutrons at PF-1000

Temporal and Spatial Measurements of Plasma Electron-Density from Linear-Stark Broadening of Dbeta (486 nm) in PF Experiment

  • Autoři: Skladnik-Sadowska, E., Malinowski, A., Sadowski, M.J., prof. RNDr. Pavel Kubeš, CSc., Scholz, M., Paduch, M., Karpinski, L., Marchenko, A., Tsarenko, A.
  • Publikace: Czechoslovak Journal of Physics. 2006, 56B(56B), 383-388. ISSN 0011-4626.
  • Rok: 2006
  • Pracoviště: Katedra fyziky
  • Anotace:
    Optic plasma diagnostics by visible spectroscopy at deuterium filling with argon admixture at the time of neutron production. e performed plasma focus experiments with comprehensive proton and neutron diagnostics.

Time Delay of the Hard X-Ray and Neutron Emission at PF Facility

  • Pracoviště: Katedra fyziky
  • Anotace:
    Diagnostics of high energy particles

Use of Thermoluminiscent Dosimeters for Measurement of Fast-Neutron Spatial Distribution at the Plasma Focus Device PF-1000

  • Autoři: Velyhan, A., Krása, J., Bienkowska, B., Ivanova-Stanik, I., Juha, L., Karpinski, L., prof. Ing. Daniel Klír, Ph.D., Králík, M., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc., Paduch, M., Scholz, M., Tomaszewski, K.
  • Publikace: Physica Scripta. 2006, T123(T123), 112-115. ISSN 0031-8949.
  • Rok: 2006
  • Pracoviště: Katedra fyziky
  • Anotace:
    Measurement of neutrons from DD reactions

Výzkum na katedře fyziky elektrotechnické fakulty ČVUT

A Small Fiber Z-Pinch as a Tool For Studying Z-Pinch Physics

  • Pracoviště: Katedra fyziky
  • Anotace:
    A Small Fiber Z-Pinch was used as a Tool For Studying Z-Pinch Physics at the Czech Technical University.

Charakteristics of Neutron Pulses at PF-1000

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Barvíř, P., prof. Ing. Daniel Klír, Ph.D., Scholz, M., Paduch, M., Tomaszewski, K., Ivanova-Stanik, I., Bienkowska, B., Karpinski, L., Juha, L., Krása, J., Sadowski, M.J., Skladnik-Sadowska, E., Jakubowski, L.I., Szydlowski, A., Malinowska, A., Malinowski, K., Schmidt, H.
  • Publikace: Dense Z-Pinches. Melville, New York: American Institute of Physics, 2005. pp. 195-198. ISSN 0094-243X. ISBN 0-7354-0297-3.
  • Rok: 2005
  • Pracoviště: Katedra fyziky
  • Anotace:
    Charakteristics of Neutron Pulses at PF-1000

Deuterated Fiber Z-Pinch on S-300 Generator

  • Autoři: prof. Ing. Daniel Klír, Ph.D., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc., Bakshaev, Yu.L., Blinov, P.I., Chernenko, A.S., Danko, S.A., Ivanov, M.I., Korolev, V.D., Ustroev, G.I., Cai Hongchum, H.
  • Publikace: Fifth International Workshop and Summer School " Towards Fusion Energy-Plasma Physics, Diagnotics, Applications. Warsaw: IPPLM, 2005. pp. 17_1-17_21.
  • Rok: 2005
  • Pracoviště: Katedra fyziky
  • Anotace:
    Deuterated Fiber Z-Pinch on S-300 Generator

Discharge at atmospheric preassure

  • Pracoviště: Katedra fyziky
  • Anotace:
    Discharge at atmospheric preassure

Experimental Results from Z-Pinch Z-150 at CTU

  • Pracoviště: Katedra fyziky
  • Anotace:
    Experimental Results from Z-Pinch Z-150 at CTU

Neutron Production at PF-1000

Neutron Production at S-300

Recent Results of MJ Plasma-Focus Device

  • Autoři: Scholz, M., Paduch, M., Tomaszewski, K., Stepnewski, W., Bienkowska, B., Ivanova-Stanik, I., Karpinski, L., Miklaszewski, R., Sadowski, M.J., Jakubowski, L., Skladnik-Sadowska, E., Szydlowski, A., Malinowska, A., prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Barvíř, P., prof. Ing. Daniel Klír, Ph.D., Tsarenko, A.V., Schmidt, H.
  • Publikace: Dense Z-Pinches. Melville, New York: American Institute of Physics, 2005. pp. 207-210. ISSN 0094-243X. ISBN 0-7354-0297-3.
  • Rok: 2005
  • Pracoviště: Katedra fyziky
  • Anotace:
    Recent Results of MJ Plasma-Focus Device

Study of X-Ray and Neutron Emission in Experiments with Al Wires in an MA Plasma Focus

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., prof. Ing. Daniel Klír, Ph.D., Barvíř, P., Scholz, M., Paduch, M., Tomaszewski, K., Ivanova-Stanik, I., Bienkowska, B., Karpinski, L., Juha, L., Krása, J., Sadowski, M.J., Jakubowski, L., Szydlowski, A., Banaszak, A., Schmidt, H., Romanova, V.
  • Publikace: Plasma Physics Reports. 2005, 31(5), 422-431. ISSN 1063-780X.
  • Rok: 2005
  • Pracoviště: Katedra fyziky
  • Anotace:
    Diagnostics of x-raxs and neutrons with temporat and spatial distribution

Time-Resolved Optical Spectroscopy of Plasma Interaction With CD2 Fiber within PF-1000 Facility

  • Autoři: Skladnik-Sadowska, E., prof. RNDr. Pavel Kubeš, CSc., Malinowski, K., Sadowski, M.J., Scholz, M., Tsarenko, A.V.
  • Publikace: Dense Z-Pinches. Melville, New York: American Institute of Physics, 2005. pp. 31. ISSN 0094-243X. ISBN 0-7354-0297-3.
  • Rok: 2005
  • Pracoviště: Katedra fyziky
  • Anotace:
    Time-Resolved Optical Spectroscopy of Plasma Interaction With CD2 Fiber within PF-1000 Facility

Wire-Array Implosion onto a Deoterated Fibre at the S-300 Facility

  • Autoři: prof. Ing. Daniel Klír, Ph.D., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc., Bakshaev, Yu.L., Blinov, P.I., Chernenko, A.S., Danko, A.S., Kodolev, V.D., Korelskij, A.V., Kravchenko, E.V., Shashkov, S.A., Ustroev, G.I., Ivanov, M.I.
  • Publikace: Plasma Devices and Operations. 2005, 13(1), 39-43. ISSN 1051-9998.
  • Rok: 2005

Carbon Fiber Z-Pinch Driven by Microsecond-Long Capacitive Discharge

  • Pracoviště: Katedra fyziky
  • Anotace:
    X-ray diagnostics of the fiber discharge

Carbon Fibre Z-Pinch at CTU

Characterisics of Dischrge at Parameters of Lightning Channel

  • Autoři: Barvíř, P., prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Scholz, M., Karpinski, L., Skladnik-Sadowska, E., Malinowski, K.
  • Publikace: BEAMS'2004 Abstracts. Saint-Petersburg: Efremov Scientific Research Institute of Electrophysical Apparatus, 2004. pp. 258. ISBN 5-87911-087-7.
  • Rok: 2004

Correlation between Pinch Dynamics, Neutron and X-ray Emission from Megajoule Plasma Focus Device

  • Autoři: Scholz, M., Bienkowska, B., Ivanova-Stanik, I., Karpinski, L., Paduch, M., Tomaszewski, K., Zielinska, E., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc., Banaszak, A.
  • Publikace: VACUUM. 2004, 76(2), 361-364. ISSN 0042-207X.
  • Rok: 2004
  • Pracoviště: Katedra fyziky
  • Anotace:
    The paper presents the results of recent experiments performed within the PF-1000 facility. The main goal of these investigations was to determine the neutron emission characteristics, which could enable an approximate settlement of the problem of the neutron emission mechanism.

Development of Diagnostics Equipment for the Large PF-1000 Experiment

  • Autoři: Scholz, M., Bienkowska, B., Gripkov, V., Ivanova-Stanik, I.M., Karpinski, L., Paduch, M., Stepniewski, V., Zielinska, E., Tomaszewski, K., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc., Banaszak, A., Jakubowski, L., Sadowski, M.J., Szydlowski, A.
  • Publikace: The 2nd German - Polish Conference on Plasma Diagnostics. Otwock-Swierk: The Andrzei Soltan Institute for Nuclear Studies, 2004. pp. 19.
  • Rok: 2004

Estimation of Energy of Fusion Neutrons at PF-1000

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., prof. Ing. Daniel Klír, Ph.D., Barvíř, P., Scholz, M., Paduch, M., Tomaszewski, K., Juha, L., Krása, J., Ivanova-Stanik, I., Bienkowska, B., Sadowski, M.J., Karpinski, L., Jakubowski, L., Skladnik-Sadowska, E., Malinowski, K., Szydlowski, A., Banaszak, A., Schmidt, H.
  • Publikace: BEAMS'2004 Abstracts. Saint-Petersburg: Efremov Scientific Research Institute of Electrophysical Apparatus, 2004. pp. 240. ISBN 5-87911-087-7.
  • Rok: 2004

Experiments with thick wires in the Load of the Z-Pinch Discharges

  • Autoři: prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Proceedings of the Fourth International Workshop and School. Warsaw: IPPLM, 2004. pp. 132-169.
  • Rok: 2004
  • Pracoviště: Katedra fyziky
  • Anotace:
    Diagnostics of high energy particles

Influence of CD2 Fiiber on the Compression in the PF-1000 Facility

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., prof. Ing. Daniel Klír, Ph.D., Barvíř, P., Scholz, M., Paduch, M., Tomaszewski, K., Ivanova-Stanik, I.M., Karpinski, L., Schmidt, H., Juha, L., Krása, J., Sadowski, M.J., Jakubowski, L., Skladnik-Sadowska, E., Malinowski, K., Szydlowski, A., Banaszak, A., Tsarenko, A.V.
  • Publikace: Czechoslovak Journal of Physics. 2004, 2004(54), 285C-290C. ISSN 0011-4626.
  • Rok: 2004
  • Pracoviště: Katedra fyziky
  • Anotace:
    X-ray and neutron diagnostics at plasma focus

Intense Soft X-Ray Emission from Plasma-Focus Device

  • Autoři: Krása, J., Bittner, M., Juha, L., prof. RNDr. Pavel Kubeš, CSc., Vorlíček, V., Scholz, M.
  • Publikace: The 2nd German - Polish Conference on Plasma Diagnostics. Otwock-Swierk: The Andrzei Soltan Institute for Nuclear Studies, 2004. pp. 55.
  • Rok: 2004

Investigation of Pinch Dynamics, Neutron and X-Ray Emission from Megajoule Plasma Focus Device

  • Autoři: Scholz, M., Bienkowska, B., Ivanova-Stanik, I.M., Karpinski, L., Paduch, M., Tomaszewski, K., Zielinska, E., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc., Banaszak, A., Jakubowski, L., Sadowski, M., Szydlowski, A.
  • Publikace: BEAMS'2004 Abstracts. Saint-Petersburg: Efremov Scientific Research Institute of Electrophysical Apparatus, 2004. pp. 242. ISBN 5-87911-087-7.
  • Rok: 2004
  • Pracoviště: Katedra fyziky
  • Anotace:
    Diagnostics of plasma focus discharge

Laser Diagnostics of the Plasma in the S-300 Pulsed Power Generator

  • Autoři: Kalinin, Yu.G., Korelskii, A.V., Kravchenko, E.V., prof. RNDr. Pavel Kubeš, CSc., Shashkov, A.Yu.
  • Publikace: Proc. SPIE XV International Symposium GCL/HPL Vol. 5777. Bellingham: SPIE, 2004. p. 808-811. ISSN 0277-786X. ISBN 0-8194-5760-4.
  • Rok: 2004

Measurement of High X-Ray Doses from PF 1000 Plasma Focus Using Si P-I-N Detectors

  • Autoři: Ryc, L., Bienkowska, B., Ivanova-Stanik, I., Kaczmarczyk, J., Paduch, M., Scholz, M., Borowiecki, M., Tomaszewski, K., Krása, J., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Czechoslovak Journal of Physics. 2004, 2004(54), 326C-333C. ISSN 0011-4626.
  • Rok: 2004

Neutron and Soft X-Ray Emission from Wire Array Z-Pinch Imploding onto Deuterated Fiber

  • Autoři: prof. Ing. Daniel Klír, Ph.D., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc., Chernenko, A.S., Bakshaev, Y.L., Blinov, P.I., Danko, S.A., Hongchum, C., Ivanov, M.I., Korolev, V.D., Kravchenko, E.V., Ustroev, G.I., Korelskij, A.V.
  • Publikace: BEAMS'2004 Abstracts. Saint-Petersburg: Efremov Scientific Research Institute of Electrophysical Apparatus, 2004. pp. 252. ISBN 5-87911-087-7.
  • Rok: 2004
  • Pracoviště: Katedra fyziky
  • Anotace:
    Time resolving diagnostics of energy particles

Neutron Production at PF 1000

  • Pracoviště: Katedra fyziky
  • Anotace:
    High energy particles research

Observation of Particles with Energy over 100 keV in Z-Pinch Device

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., prof. Ing. Daniel Klír, Ph.D., Kravárik, J., Bakshaev, Yu.L., Blinov, P.I., Chernenko, A.S., Danko, S.A., Ivanov, M.I., Korolev, V.D., Korelski, A.V., Kravchenko, E.V., Schashkov, A.Yu., Ustroev, G.I.
  • Publikace: Proc. SPIE XV International Symposium GCL/HPL Vol. 5777. Bellingham: SPIE, 2004. pp. 812-815. ISSN 0277-786X. ISBN 0-8194-5760-4.
  • Rok: 2004

Research of the Discharge with Parameters of Lightning Channel

  • Autoři: Barvíř, P., prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Scholz, M., Karpinski, L., Skladnik-Sadowska, E., Malinowski, K.
  • Publikace: Czechoslovak Journal of Physics. 2004, 2004(54), 274C-278C. ISSN 0011-4626.
  • Rok: 2004
  • Pracoviště: Katedra fyziky
  • Anotace:
    Study of current channel evolution

Some Characteristics of Fusion Neutrons Produced by Deuterium in Loads of Z-Pinch Devices

  • Pracoviště: Katedra fyziky
  • Anotace:
    Study of hard x-rays and neutrons from deuterized load

Study at PF-1000

  • Pracoviště: Katedra fyziky
  • Anotace:
    Research of high energy particles

Study of Discharge with Parameters of Lightning

  • Autoři: Barvíř, P., prof. RNDr. Pavel Kubeš, CSc., Kravárik, J.
  • Publikace: Workshop 2004. Praha: České vysoké učení technické v Praze, 2004. pp. 78-79. ISBN 80-01-02945-X.
  • Rok: 2004

X-Ray Diagnostics of Fibre Z-Pinches

Ablation of Organic Polymers by Soft X-rays Emitted from Plasma Focus PF-1000 Device

  • Autoři: Viskup, R., Krása, J., Juha, L., Scholz, M., prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: e-Book International Congference Plasma 2003. Warsaw: IPPLM, 2003. pp. 341-348.
  • Rok: 2003

Ablation of Various Materials with Intense XUV Radiation

  • Autoři: Juha, L., Krása, J., Cejnarová, A., Chvostová, D., Vorlíček, V., Krzywinski, J., Sobierajski, R., Andrejczuk, A., Jurek, M., Klinger, D., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc., Pína, L.
  • Publikace: Nuclear Instruments and Methods in Physics Research, Section A, Accelerators, Spectrometers, Detectors and Associated Equipment. 2003, 507(1), 577-581. ISSN 0168-9002.
  • Rok: 2003
  • Pracoviště: Katedra fyziky
  • Anotace:
    Ablation behavior of organic polymer (polymethylmethacrylate) and elemental solid (silicon) irradiated by single pulses of XUV radiation emitted from Z-pinch, plasma-focus, and laser-produced plasmas was investigated. The ablation characteristics measured for these plasma-based sources will be compared with those obtained for irradiation of samples with XUV radiation generated by a free-electron laser.

Ball Lightning: Experimemts and Models

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Barvíř, P., Karpinski, L., Scholz, M.
  • Publikace: XIIth Conference on Plasma Physics and Applications - Abstracts. Bucharest: Ministry of Education, Research and Youth, 2003. pp. 17.
  • Rok: 2003

Ball Lightning: Experiments and Models

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Barvíř, P., Kravárik, J., Karpinski, L., Scholz, M.
  • Publikace: XIIth Conference on Plasma Physics and Applications - Abstracts. Bucharest: Ministry of Education, Research and Youth, 2003. pp. 17.
  • Rok: 2003

Characteristics of High Current Discharge at Atmospheric Pressure

  • Autoři: Barvíř, P., prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Scholz, M., Karpinski, L.
  • Publikace: e-Book International Congference Plasma 2003. Warsaw: IPPLM, 2003. pp. 611-614.
  • Rok: 2003

Detection of Neutrons at PF-1000 Facility

Diagnostics of High Current Discharge at Atmospheric Pressure

  • Autoři: Barvíř, P., prof. RNDr. Pavel Kubeš, CSc., Kravárik, J.
  • Publikace: Proceedings of the Third International Workshop and School "Plasma Physics, Diagnostics and Plasma Related Applications". Warsaw: Institute of Plasma Physics, 2003. pp. 410-415.
  • Rok: 2003

Dinamika i izluchenyie iz medno-provolochnoyi korony v megaampernom z-pinche

Essence of the Ball Lightning

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Barvíř, P., Kravárik, J., Karpinski, L., Scholz, M.
  • Publikace: Proceedings of the Third International Workshop and School "Plasma Physics, Diagnostics and Plasma Related Applications". Warsaw: Institute of Plasma Physics, 2003. pp. 246-261.
  • Rok: 2003

Experimental Study of Z-pinch Evolution with Carbon Fiber Used as Load

Influence of Carbon Fibre on Megaampere Plasma Focus Radiation

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., prof. Ing. Daniel Klír, Ph.D., Scholz, M., Paduch, M., Tomaszewski, K., Ivanova-Stanik, I., Bienkowska, B., Karpinski, L., Juha, L., Krasa, J., Viskup, R.
  • Publikace: e-Book International Congference Plasma 2003. Warsaw: IPPLM, 2003. pp. 381-384.
  • Rok: 2003

Issledovaniya Myagkogo rentgenovskogo izlucheniya bistrogo kapillyarnogo razryada

  • Autoři: Koláček, K., Schmidt, J., Boháček, V., Řípa, M., Rupasov, A., Shikanov, A., prof. RNDr. Pavel Kubeš, CSc., Kravárik, J.
  • Publikace: Fizika plazmy. 2003, 29(4), 318-324. ISSN 0367-2921.
  • Rok: 2003

Properties of Soft X Radiation from a Fast Capillary Discharge

  • Autoři: Koláček, K., Schmidt, J., Boháček, V., Rípa, M., Rupasov, A., Shikanov, A., prof. RNDr. Pavel Kubeš, CSc., Kravárik, J.
  • Publikace: Plasma Physics Reports. 2003, 29(4), 290-295. ISSN 1063-780X.
  • Rok: 2003
  • Pracoviště: Katedra fyziky
  • Anotace:
    Diagnostika měkkého rentgenového záření

Response of Polymetyl to Soft X-Ray Radiation

  • Autoři: Viskup, R., Krása, J., Juha, L., prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Proceedings of the Third International Workshop and School "Plasma Physics, Diagnostics and Plasma Related Applications". Warsaw: Institute of Plasma Physics, 2003. pp. 380-385.
  • Rok: 2003

Status and Prospect of Megajoule Plasma-Focus Experiment at ICDMP

  • Autoři: Scholz, M., Bienkowska, B., Gribkov, V., Ivanova-Stanik, I., Karpinski, L., Paduch, M., Stepniewski, W., Tomaszewski, K., Zielinska, E., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: e-Book International Congference Plasma 2003. Warsaw: IPPLM, 2003. pp. 341-348.
  • Rok: 2003
  • Pracoviště: Katedra fyziky
  • Anotace:
    Přehled výzkumu v roce 2003

Status and Prospects of Megajoule Plasma Focus Experiment at ICDMP

  • Autoři: Scholz, M., Bienkowska, B., Gribkov, V., Ivanova-Stanik, I., Karpinski, L., Paduch, M., Stepniewski, V., Tomaszewski, K., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: e-Book International Congference Plasma 2003. Warsaw: IPPLM, 2003. pp. 341-348.
  • Rok: 2003

The Dynamics of Radiation from a Copper-Wire Corona in a Magaampere Z-Pinch

  • Pracoviště: Katedra fyziky
  • Anotace:
    Vývoj rengenového záření z výboje s drátkem

Visualization of High Current Discharge at Atmospheric Pressure

  • Autoři: Barvíř, P., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Proceedings of Workshop 2003 (online). Praha: České vysoké učení technické v Praze, 2003. pp. 64-65. ISBN 80-01-02708-2.
  • Rok: 2003

Wire Experiments on the PF 1000

X-Ray and Neutron Diagnostics in Experiment with Al Wire in MA Plasma Focus Discharge

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., prof. Ing. Daniel Klír, Ph.D., Scholz, M., Paduch, M., Tomaszewski, K., Ivanova-Stanik, I., Bienkowska, B., Juha, L., Krasa, J., Viskup, R., Sadowski, M., Jakubowski, L.
  • Publikace: Ifsa Abstract Book 2003. Los Alamos: Los Alamos National Laboratory, 2003. pp. 367.
  • Rok: 2003

XUV and Soft X-Ray Emission from the Fast Z-Pinch Discharge

  • Autoři: prof. Ing. Daniel Klír, Ph.D., prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Bakshaev, Y., Danko, S., Chernenko, A., Korolev, V., Blinov, P., Gordeev, E., Kravchenko, E., Shashkov, A., Ivanov, M., Korelskij, A.
  • Publikace: Ifsa Abstract Book 2003. Los Alamos: Los Alamos National Laboratory, 2003. pp. 362.
  • Rok: 2003

XUV Spectroscopic Measurement on Carbon Fibre Z-Pinch

Ablation of Organic Polymers and Elemental Solids Induced by Intense

  • Autoři: Juha, L., Prag, A., Krasa, J., Cejnarová, A., Kralikova, B., Skala, J., Chvostova, D., Vorlicek, V., Krzywinski, J., Andrejczuk, A., Jurek, M., Klinger, D., Sobierajski, R., Fiedorowicz, H., Bartnik, A., Pina, L., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc., Bakshaev, Y., Chernenko, A., Korolev, V., Ivanov, M., Scholz, M., Ryc, L., Tomaszewski, K., Viskup, R., Boody, F.
  • Publikace: X-Ray Lasers 2002: 8th International Conference on X-Ray Lasers. Melville, New York: American Institute of Physics, 2002. pp. 504-509. ISSN 0094-243X. ISBN 0-7354-0096-2.
  • Rok: 2002

Ablation of PMMA, PTFE, and Si by Soft X-Rays Emitted from Hot Dense Plasma

  • Autoři: Juha, L., Krása, J., Praeg, A., Cejnarová, A., Chvostová, D., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc., Bakshaev, Y., Chernenko, A., Korolev, V., Tumanov, V., Ivanov, M., Scholz, M., Ryc, L., Tomaszewski, K., Viskup, R., Boody, F., Kodymova, J.
  • Publikace: Proceedings of SPIE Vol. 4760. Washington: SPIE, 2002. pp. 1098-1105. ISSN 0277-786X. ISBN 0-8194-4524-X.
  • Rok: 2002

Ablation of Polymethyl Methacrylate by a Single Pulse of Soft X-Rays Emitted from Z-Pinch and Laser_Produced Plasmas

  • Autoři: Juha, L., Krása, J., Praeg, A., Cejnarová, A., Chvostová, D., Rohlena, K., Jungwirth, K., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc., Bakshaev, Y., Chernenko, A., Korolev, V., Tumanov, V., Ivanov, M., Bernardinello, A., Ullschmied, J., Boody, F.
  • Publikace: Surface Review and Letters. 2002, 9(1), 347-352. ISSN 0218-625X.
  • Rok: 2002
  • Pracoviště: Katedra fyziky
  • Anotace:
    The efficiency of ablation induced in poly(methyl methacrylate) (PMMA) by single soft X-ray pulses emitted from Z-pinch and laser-produced plasmas was determined. X-ray ablation of PMMA was found to be less efficient than that of teflon (PTFE). Nonthermal effects of the radiation on the polymer structure play a key role in the mechanisms of the ablation, i.e. the ablation can be explained by the formation of radiation-chemical scissions of the polymer chain followed by blowoff of low-molecular fragment fluid into the vacuum. The most promising application of this phenomenon seems to be micropatterning/micromachining.

Diagnostics of Plasma by Pulse Laser Beam

  • Autoři: prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Proceedings of the 2nd International School Plasma Diagnostics and Technology. Warsaw: Institute of Plasma Physics, 2002. pp. 19-25.
  • Rok: 2002

Dinamika korony aluminievoj provolochki v megaampernom pinche

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Renner, O., Kravárik, J., Krouský, E., Bakshayev, Y., Blinov, P., Chernenko, A., Gordeev, E., Danko, S., Korolev, V., Shashkov, A.
  • Publikace: Fizika plazmy. 2002, 28(4), 329-336. ISSN 0367-2921.
  • Rok: 2002

Dinamika zzhatyia cborki iz volframobych provolochek na centralnuyiu aluminievuyiu provolochku

Dynamics of an Al Wire Corona of a Megaampere Z-pinch

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Renner, O., Kravárik, J., Krouský, E., Bakshaev, Y., Blinov, P., Chernenko, A., Gordeev, E., Danko, S., Korolev, V., Shashkov, A.
  • Publikace: Plasma Physics Reports. 2002, 28(4), 296-302. ISSN 1063-780X.
  • Rok: 2002

Dynamics of the Implosion of a Tungsten Wire Array onto the Central Aluminium Wire

Emission of Carbon Fibre at Small Z-Pinch

Energy Transformation in Plasma Focus Discharge with Wire and Liner as a Load

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., prof. Ing. Daniel Klír, Ph.D., Scholz, M., Paduch, M., Tomaszewski, K., Karpinski, L., Ryc, L., Juha, L., Krása, J., Szydlowski, A., Romanova, V.
  • Publikace: Nucleonika, The International Journal of Nuclear Research. 2002, 47(4), 151-153. ISSN 0029-5922.
  • Rok: 2002
  • Pracoviště: Katedra fyziky
  • Anotace:
    Rentgenová diagnostika horkého hustého plazmatu

Energy Transformation in Z-Pinch and PF Discharges with the Wire and Wire-in-Liner Loads

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., prof. Ing. Daniel Klír, Ph.D., Scholz, M., Paduch, M., Tomaszewski, K., Karpinski, L., Bakshaev, Y., Blinov, P., Chernenko, A., Danko, S., Korolev, V., Shashkov, A.
  • Publikace: Program and Book of Abstracts 5th DZP. Albuquerque, New Mexico: Sandia National Laboratories, 2002. pp. 74.
  • Rok: 2002

Experiments with the PF-1000 Plasma Focus Facility at 750 kJ Energy Level

  • Autoři: Scholz, M., Bienkowska, B., Ivanova-Stanik, I., Karpinski, L., Miklaszewski, R., Paduch, M., Piszarczyk, T., Tomaszewski, K., Zielinska, E., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc., Banaszak, A., Jakubowski, L., Sadowski, M., Szidlowski, A., Schmidt, H., Vitulli, S., Kasperczuk, A.
  • Publikace: Czechoslovak Journal of Physics. 2002, 52(Suppl. D), D100-D106. ISSN 0011-4626.
  • Rok: 2002
  • Pracoviště: Katedra fyziky
  • Anotace:
    Výzkum magnetizovaného plazmatu

Program and Book of Abstracts 5th DZP

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., prof. Ing. Daniel Klír, Ph.D., Scholz, M., Paduch, M., Tomaszewski, K., Karpinski, L., Juha, L., Krása, J., Jakubowski, L., Szydlowski, A., Schmidt, H., Romanova, V.
  • Publikace: Program and Book of Abstracts 5th DZP. Albuquerque, New Mexico: Sandia National Laboratories, 2002. pp. 65.
  • Rok: 2002

Research in frame ICDMP 2001

Řízená termojaderná fúze na principu magnetických pinčů

  • Pracoviště: Katedra fyziky
  • Anotace:
    Přehled současného stavu výzkumu

Semiconductor and Thermoluminescent Dosimetry of Pulsed Soft X Ray Plasma Sources

  • Autoři: Krása, J., Cejnarová, A., Juha, L., Ryc, L., Scholz, M., prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Radiation Protection Dosimetry. 2002, 100(1), 429-432. ISSN 0144-8420.
  • Rok: 2002

Soft X-Ray Spectral Investigation in Wire-in-Plasma Focus Experiment

  • Autoři: Karpinski, L., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc., Paduch, M., Pikuz, S., Romanova, V., Sholz, M., Szydlowski, A., Tomaszewski, K.
  • Publikace: Plasma Physics and Controlled Fusion. 2002, 44(7), 1609-1614. ISSN 0741-3335.
  • Rok: 2002

Výzkum v rámci mezinárodního centra hustého magnetizovaného plazmatu

  • Autoři: prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Proceedings of 14th Conference Czech and Slovak Physicists. Plzeň: ZČU Plzeň, 2002. pp. 429-433. ISBN 80-7082-907-9.
  • Rok: 2002
  • Pracoviště: Katedra fyziky
  • Anotace:
    Výzkum rentgenových a neutronových zdrojů

X-Ray and Neutron Emission from PF-1000 Facility

  • Autoři: Scholz, M., Bienkowska, B., Ivanova-Stanik, I., Karpinski, L., Miklaszewski, R., Paduch, M., Tomaszewski, K., Zielinska, E., Sadowski, M., Jakubowski, L., Szydlowski, A., Banaszak, A., Schmidt, H., prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Romanova, V., Vitilli, S.
  • Publikace: Program and Book of Abstracts 5th DZP. Albuquerque, New Mexico: Sandia National Laboratories, 2002. pp. 255-260.
  • Rok: 2002

X-Ray Emission at Compression of Deuterium Current-Sheath with Combined Liner and Wire in Plasma Focus Discharge

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., prof. Ing. Daniel Klír, Ph.D., Scholz, M., Paduch, M., Tomaszewski, K., Ivanova-Stanik, I., Bienkowska, B., Karpinski, L., Ryc, L., Juha, L., Krása, J., Sadowski, M., Jakubowski, L., Szydlowski, A., Banaszak, A., Schmidt, H., Romanova, V.
  • Publikace: Czechoslovak Journal of Physics. 2002, 52(Suppl. D), D117-D121. ISSN 0011-4626.
  • Rok: 2002
  • Pracoviště: Katedra fyziky
  • Anotace:
    Výzkum plazmatu s vysokou hustotou energie

X-Ray Pulses Emitted at Liner Implosion

X-ray Pulses Emitted from Aluminium Wire-in-Liner Loads

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., prof. Ing. Daniel Klír, Ph.D., Bakshaev, Y., Blinov, P., Chernenko, A., Danko, S., Korolev, V., Shashkov, A., Tumanov, V., Juha, L., Krása, J., Ivanov, M.
  • Publikace: Czechoslovak Journal of Physics. 2002, 52(Suppl. D), D122-D126. ISSN 0011-4626.
  • Rok: 2002

XUV Emission From Small Z-Pinch

XUV Pulses of Al Wire at Small Z-Pinch

Carbon Wire Experiment at Small Z-Pinch

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Klír, D.
  • Publikace: Book of Abstracts - PLASMA-2001. Warsaw: Institute of Plasma Physics, 2001. pp. 89.
  • Rok: 2001
  • Pracoviště: Katedra fyziky
  • Anotace:
    Detekce rentgenového záření

Carbon Wire Experiment at Small Z-Pinch

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Klír, D.
  • Publikace: Plasma 2001 "Research and Applications of Plasmas". Warsaw: Institute of Plasma Physics, 2001. pp. P318.
  • Rok: 2001

Carbon Wire Experiment on Z-150 at CTU Prague

  • Autoři: Klír, D., prof. RNDr. Pavel Kubeš, CSc., Kravárik, J.
  • Publikace: International School High Current Plasma Experiments and Diagnostics Programme Abstracts. Warsaw: Institute of Plasma Physics, 2001. pp. 4.
  • Rok: 2001

Characterization of X-Ray Pulses Emitted due to 2-MA Implosion of a Wire Array

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Juha, L., Krása, J., Bakshayev, Y., Blinov, P., Chernenko, A., Danko, S., Korolev, V., Shashkov, A., Tumanov, V., Chesnokov, A., Ivanov, M.
  • Publikace: Book of Abstracts - PLASMA-2001. Warsaw: Institute of Plasma Physics, 2001. pp. 90.
  • Rok: 2001
  • Pracoviště: Katedra fyziky
  • Anotace:
    Diagnostika Z-pinčového výboje

Characterization of X-Ray Pulses Emitted due to the 2 MA Implosion of a Wire-Array

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Klír, D., Bakshaev, Y., Blinov, P., Chernenko, A., Dańko, S., Korolev, V., Shashkov, A., Tumanov, V., Juha, L., Krása, J., Chesnokov, A., Ivanov, M.
  • Publikace: Plasma 2001 "Research and Applications of Plasmas". Warsaw: Institute of Plasma Physics, 2001. pp. P319.
  • Rok: 2001

Dosimetry of X-Ray Emission from the PF-1000 Plasma Focus Discharge

  • Autoři: Krása, J., Juha, L., Ryć, L., Tomaszewski, K., Scholz, M., Paduch, M., prof. RNDr. Pavel Kubeš, CSc., Kravárik, J.
  • Publikace: Plasma 2001 "Research and Applications of Plasmas". Warsaw: Institute of Plasma Physics, 2001. pp. P33.
  • Rok: 2001
  • Pracoviště: Katedra fyziky
  • Anotace:
    Kalibrace rentgenových detektorů

Dosimetry of X-Ray Emission from the PF-1000 Plasma Focus Facility

  • Autoři: Krása, J., Juha, L., Ryć, L., Scholz, M., Tomaszewski, K., Paduch, M., prof. RNDr. Pavel Kubeš, CSc., Kravárik, J.
  • Publikace: Book of Abstracts - PLASMA-2001. Warsaw: Institute of Plasma Physics, 2001. pp. 74.
  • Rok: 2001
  • Pracoviště: Katedra fyziky
  • Anotace:
    Diarnostika rentgenového záření

Energy Transformation in Plasma Focus Discharge with Wire and Liner as a Load

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Klír, D., Scholz, M., Paduch, M., Tomaszewski, K., Ryć, L., Juha, L., Krása, J., Szydlowski, A., Romanova, V.
  • Publikace: Plasma 2001 "Research and Applications of Plasmas". Warsaw: Institute of Plasma Physics, 2001. pp. O33.
  • Rok: 2001

Energy Transformation in Plasma Focus Discharge with Wire and Liner as a Load

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Juha, L., Krása, J., Paduch, M., Tomaszewski, K., Scholz, M., Ryć, L., Szydlowski, A., Romanova, V.
  • Publikace: Book of Abstracts - PLASMA-2001. Warsaw: Institute of Plasma Physics, 2001. pp. 71.
  • Rok: 2001
  • Pracoviště: Katedra fyziky
  • Anotace:
    Rentgenová diagnostika zažízení Plasma Fokusu

New Form of Energy Transformation on Z-pinch Principle

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J.
  • Publikace: Proceedings of Workshop 2001. Praha: České vysoké učení technické v Praze, 2001. pp. 88-89. ISBN 80-01-02335-4.
  • Rok: 2001

Non-thermal Pumping of the H-like Ions by Z-pinch Discharge

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Paduch, M., Tomaszewski, K., Scholz, M.
  • Publikace: Journal de Physique IV. 2001, 11(2), 263-266. ISSN 1155-4339.
  • Rok: 2001
  • Pracoviště: Katedra fyziky
  • Anotace:
    Rentgenová diagnostika Z-pinčového výboje

Novinky v řízené termojaderné fúzi

Research in Frame of the ICDMP

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J.
  • Publikace: Proceedings of Workshop 2001. Praha: České vysoké učení technické v Praze, 2001. pp. 86-87. ISBN 80-01-02335-4.
  • Rok: 2001

Řízená termonukleární fúze v roce 2001

Soft X-ray Emission from a Plasma Focus Discharge with Wire and Liner Loads

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Paduch, M., Tomaszewski, K., Scholz, M.
  • Publikace: 2nd IFSA Abstracts. Osaka: Osaka University, 2001. pp. 60.
  • Rok: 2001
  • Pracoviště: Katedra fyziky
  • Anotace:
    Diagnostika aparatury PF-1000 v IPPLM ve Varšavě

Stabilizing of Z-pinch Plasma Focus Discharges due to Thick Wires

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Paduch, M., Tomaszewski, K., Scholz, M., Karpinski, L., Szydlowski, A., Bakshaev, Y., Blinov, P., Chernenko, A., Gordeev, E., Dańko, S., Korolev, V., Shashkov, A., Tumanov, V., Romanova, V., Klír, D.
  • Publikace: Nucleonika, The International Journal of Nuclear Research. 2001, 46(1), 5-8. ISSN 0029-5922.
  • Rok: 2001
  • Pracoviště: Katedra fyziky
  • Anotace:
    Diagnostika plazmatu výkonných pulzních výbojů

Study of XUV Emission from Wire-Array Implosions at S-300

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Korolev, V., Chernenko, A.
  • Publikace: 2nd IFSA Abstracts. Osaka: Osaka University, 2001. pp. 147.
  • Rok: 2001
  • Pracoviště: Katedra fyziky
  • Anotace:
    Diagnostika z- pinčového výboje na aparatuře 3-300 v Kurčatově institutu v Moskvě

Concept of the High Energy Photon Emission from the Wire Array Z-Pinch

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Klír, D., Bakshaev, Y., Chernenko, A., Danko, S., Korolev, V.
  • Publikace: ECLIM 2000 Book of Abstracts. Praha: České vysoké učení technické v Praze, 2000. pp. 173.
  • Rok: 2000

Dynamics of the Wire Array Implosion

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Bakshaev, Y., Chernenko, A., Danko, S., Korolev, V., Shashkov, A., Blinov, P., Tumanov, V., Gordeev, E.
  • Publikace: Czechoslovak Journal of Physics. 2000, 50(S3), 109-112. ISSN 0011-4626.
  • Rok: 2000

Experimental Studies of Al Corona Plasma Created within the Plasma Focus Facility

  • Autoři: Scholz, M., Karpinski, L., Tomaszewski, K., Paduch, M., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc., Szydlowski, A., Romanova, V., Pikuz, S.
  • Publikace: Czechoslovak Journal of Physics. 2000, 50(S3), 150-154. ISSN 0011-4626.
  • Rok: 2000

Identification of the Governing Parameters of Self-Organizing Structures in Z-Pinch Plasmas

  • Autoři: Ortiz-Tapia, A., prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Czechoslovak Journal of Physics. 2000, 50(S3), 145-149. ISSN 0011-4626.
  • Rok: 2000

Implosion of the Liner to the Thick Al Wire

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Bakshaev, Y., Chernenko, A., Korolev, V.
  • Publikace: Program and Abstracts BEAMS 2000. Nagoya: National Institute for Fusion Science, 2000. pp. 126.
  • Rok: 2000

Magnetic Pinch Power Supply

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Chernenko, A., Korolev, V., Danko, S.
  • Publikace: Proceedings of Workshop 2000. Praha: České vysoké učení technické v Praze, 2000. pp. 60. ISBN 80-01-02229-3.
  • Rok: 2000

Non-Thermal Pumping of the H-Like Ions by Z-Pinch Discharge

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Tomaszewski, K., Paduch, M., Skladnik-Sadowska, E., Sadowski, M.
  • Publikace: Program and Abstracts 7th International Conference on X-Ray Lasers. Orsay: Université Paris-Sud, 2000. pp. 82.
  • Rok: 2000
  • Pracoviště: Katedra fyziky
  • Anotace:
    XUV spektroskopická diagnostika

Novinky v jaderné fúzi

  • Autoři: prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Proceedings 4th Int. Conf. EIA. Praha: České vysoké učení technické v Praze, Fakulta elektrotechnická, 2000. pp. 377-380. ISBN 80-01-02239-0.
  • Rok: 2000

Řízená termojaderná fúze na principu magnetických pinčů

  • Autoři: Kravárik, J., Barvíř, P., Kozlík, V., Svatoš, O., prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Elektroenergetika 2000. Praha: České vysoké učení technické v Praze, 2000. pp. 183-186. ISBN 80-01-02238-2.
  • Rok: 2000

Spectroscopic Study of the Fast Capillary Discharge

  • Autoři: Koláček, K., Schmidt, J., prof. RNDr. Pavel Kubeš, CSc., Kravárik, J.
  • Publikace: Program and Abstracts BEAMS 2000. Nagoya: National Institute for Fusion Science, 2000. pp. 172.
  • Rok: 2000

Spectroscopic Study of the Fast Capillary Discharge

  • Autoři: Koláček, K., Schmidt, J., Boháček, V., Šunka, P., Ullschmied, J., Řípa, M., Piffl, V., Rupasov, A.A., Shikanov, A.S., prof. RNDr. Pavel Kubeš, CSc., Kravárik, J.
  • Publikace: 13th International Conference on High-Power Particle Beams, BEAMS'2000. Program and Abstracts. Nagaoka: University of Nagaoka, 2000. pp. 172.
  • Rok: 2000

Stabilizing of Z-pinch and Plasma Focus Discharges due to Thick Wires

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Scholz, M., Romanova, V., Chernenko, A., Korolev, V.
  • Publikace: International Workshop on Dense Magnetized Plasmas 2000. Warsaw: IPPLM, 2000. pp. 2.
  • Rok: 2000
  • Pracoviště: Katedra fyziky
  • Anotace:
    Generace vysoce energetického rentgenového záření

X-Ray Source on Magnetic Pinch Principle

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Aschke, L., Andreic, Ž., Kunze, H.
  • Publikace: Proceedings of Workshop 2000. Praha: České vysoké učení technické v Praze, 2000. pp. 77. ISBN 80-01-02229-3.
  • Rok: 2000

XUV Emission of the Wire-Plasma Focus Discharge

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Klír, D., Paduch, M., Tomaszewski, K., Skladnik-Sadowska, E., Sadowski, M.
  • Publikace: Czechoslovak Journal of Physics. 2000, 50(S3), 207-212. ISSN 0011-4626.
  • Rok: 2000

A Kinetic Model of the Plasma Flow at the Magnetic Z-Pinch and the Plasmoid Structure. Part 2

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Prikarpatskij, A., Zagrodzinski, J., Prikarpatskij, Y.
  • Publikace: Journal of Physical Studies. 1999, 3(1), 42-46. ISSN 1027-4642.
  • Rok: 1999

Diagnostics of the Stable Carbon Corona Generated by a Small Z-Pinch

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Aschke, L., Andreič, Ž., Kunze, H.
  • Publikace: Proceedings 14th International Symposium on Plasma Chemistry. Praha: AV ČR, Ústav fyziky plazmatu, 1999. pp. 979-984. ISBN 80-902724-2-8.
  • Rok: 1999
  • Pracoviště: Katedra fyziky
  • Anotace:
    Diagnostika magnetizovaného plazmatu

No-thermal Radiation of the Thick Wire Corona Generated by Z-pinch

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J.
  • Publikace: Proceedings of Workshop 99. Praha: České vysoké učení technické v Praze, 1999, pp. 71.
  • Rok: 1999
  • Pracoviště: Katedra fyziky
  • Anotace:
    Netermalni zareni korony silnych dratku generovanych Z-pincem

Non-Thermal Emission from a Thick Cu Wire Corona of the MA Z-Pinch

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Klír, D., Krouský, E., Renner, O., Chernenko, A., Danko, S., Korolev, V.
  • Publikace: Journal of Technical Physics. 1999, 15(S1), 173-176. ISSN 0324-8313.
  • Rok: 1999
  • Pracoviště: Katedra fyziky
  • Anotace:
    Diagnostika magnetických pinčů

Non-Thermal Radiation from Z-Pinch Stable Corona

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Renner, O., Krouský, E., Chernenko, A., Korolev, V.
  • Publikace: 26th EPS Conference on Controlled Fusion and Plasma Physics - Contributed Papers. Nieuwegein: FOM-Institute for Plasma Physics, 1999. pp. 933-936.
  • Rok: 1999

Současný stav výzkumu magnetických pinčů

  • Autoři: prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: 13. konferencia slovenských a českých fyzikov: Zborník abstraktov. Bratislava: Slovenská fyzikálna spoločnosť, 1999. pp. 15.
  • Rok: 1999

Stable Plasma Corona Generated by Plasma Focus

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Scholz, M., Paduch, M., Tomaszewski, K., Karpinski, L., Szidlowski, A., Romanova, V.
  • Publikace: Proceedings Contributed Papers XXIV ICPIG. Warsaw: IPPLM, 1999. pp. 115-116.
  • Rok: 1999
  • Pracoviště: Katedra fyziky
  • Anotace:
    Diagnostika korony plazmatu hliníkového drátku

VUV-Spectroskopie von Entladungen an Kohlenstoffdrahten

  • Autoři: Aschke, L., Andreic, Ž., prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Kunze, H.
  • Publikace: Zusammenfassungen der Beitrage der Verhandlungen der Deutchen Physikalischen Gesellshaft. Heidelberg: Physica-verlag, 1999. pp. 368. ISSN 0420-0195.
  • Rok: 1999

Wire Target Experiment with the PF-1000 Plasma Focus Facility

  • Autoři: Scholz, M., prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Paduch, M., Tomaszewski, K., Karpinski, L., Szydlowski, A., Romanova, V.
  • Publikace: Journal of Technical Physics. 1999, 15(S1), 109-112. ISSN 0324-8313.
  • Rok: 1999
  • Pracoviště: Katedra fyziky
  • Anotace:
    Diagnostika hustého magnetizovaného plazmatu

Diagnostics of a Thick Fiber Corona of a MA Z-pinch

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Blinov, P., Chernenko, A., Gordeev, E., Danko, S., Korolev, V., Tumanov, V.
  • Publikace: 1998 ICPP Contributed Papers. Eindhoven: European Physical Society, 1998. pp. 993-996.
  • Rok: 1998
  • Pracoviště: Katedra fyziky
  • Anotace:
    Rentgenová diagnostika plazmatu

Evolution of the Gas-Puff Z-Pinch Column

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Koláček, K., Krejčí, A., Kravárik, J., Paduch, M., Tomaszewski, K.
  • Publikace: IEEE Transactions on Plasma Science. 1998, 26(4), 1113-1118. ISSN 0093-3813.
  • Rok: 1998
  • Pracoviště: Katedra fyziky
  • Anotace:
    Vizuální a rentgenová diadnostika

Generation of VUV-Radiation of a Rod Corona from a Small Magnetic Pinch

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Ortiz-Tapia, A., Karpinski, L., Aschke, L., Andreič, Ž., Kunze, H.
  • Publikace: 1998 ICPP Contributed Papers. Eindhoven: European Physical Society, 1998. pp. 997-1000.
  • Rok: 1998
  • Pracoviště: Katedra fyziky
  • Anotace:
    Diagnostika magnetických pinčů

Magnetic Pinches in Astrophysics and Electromagnetic Collapse

Monochromatic X-radiation of Z-pinch Carbon Rod

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Karpinski, L.
  • Publikace: BEAMS'98 Program and Abstracts. Tel Aviv: KENES, 1998. pp. 233.
  • Rok: 1998

Physics Teaching Using WWW and Other Progressive Techniques

Plasma Corona of the Thick Metal Fibers

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Karpinski, L.
  • Publikace: PF'98 Program and Abstracts. Warsaw: IPPLM, 1998. pp. 66.
  • Rok: 1998
  • Pracoviště: Katedra fyziky
  • Anotace:
    Fyzika plazmatu tenkých drátků

Plasma Corona of the Thick Metal Fibers

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Danko, S., Černěnko, A., Korolev, V., Aschke, L., Kunce, H., Andrejič, Ž., Karpinski, L.
  • Publikace: Journal of Technical Physics. 1998, 39(12), 155-159. ISSN 0324-8313.
  • Rok: 1998

Professor Janča Anniversary - Personal Account

The Vortex Structure of Langmuir turbulence in the Interrupted Magnetic Z-Pinch. Part 1

Web Pages and Educational Programs in Physics for Prospective CTU Students

  • Pracoviště: Katedra fyziky
  • Anotace:
    Webovské stránky a výukové programy pro fyziku pro budoucí studenty ČVUT

X-radiation of Thick Carbon Fibre Corona

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J.
  • Publikace: Workshop 98. Praha: České vysoké učení technické v Praze, 1998, pp. 89-90.
  • Rok: 1998
  • Pracoviště: Katedra fyziky
  • Anotace:
    Rentgenové záření korony silného uhlíkového vlákna

A Kinetic Model of The Plasma Flow at the Magnetic Z-pinch and the Plasmoid Structure

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Prykarpatsky, A., Zagrodzinski, J., Prykarpatsky, J.
  • Publikace: Proceedings of 18th Symposium on Plasma Physics and Technology. Praha: ČVUT FEL, Katedra fyziky, 1997. pp. 106-109. ISBN 80-01-01641-2.
  • Rok: 1997

Asymmetric Soft X-ray Emission from Small Pinches

  • Autoři: prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Invited Papers Plasma 97 - International Symposium on Plasma Research and Applications. Opole: Universytet Opolski, 1997. pp. 1. ISBN 83-902319-4-8.
  • Rok: 1997

Carbon Fibre X-ray Lasing

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J.
  • Publikace: Fourth International Conference on Dense Z-Pinches. Philadelphia: American Institute of Physics, 1997. pp. 449-453. ISBN 1-56396-610-7.
  • Rok: 1997

Diagnostics of Small Carbon Fiber X-pulse

  • Autoři: Kravárik, J., prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Fourth International Conference on Dense Z-Pinches. Philadelphia: American Institute of Physics, 1997. pp. 503-509. ISBN 1-56396-610-7.
  • Rok: 1997

Diagnostics of the Thick Carbon Fibre Z-pinch

  • Autoři: Davies, H., Lorenz, A., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Fourth International Conference on Dense Z-Pinches. Philadelphia: American Institute of Physics, 1997. pp. 507-511. ISBN 1-56396-610-7.
  • Rok: 1997

Investigation of XUV-Pulse in Carbon Fibre Discharge

  • Autoři: Kravárik, J., prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Proceedings of 18th Symposium on Plasma Physics and Technology. Praha: ČVUT FEL, Katedra fyziky, 1997. pp. 89-92. ISBN 80-01-01641-2.
  • Rok: 1997

Strong Assymetry X-Ray Source in Carbon Fibre Magnetic Pinch

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Paduch, M., Tomaszewski, K., Gogolewski, P.
  • Publikace: Workshop 97. Praha: České vysoké učení technické v Praze, 1997. pp. 97-98.
  • Rok: 1997
  • Pracoviště: Katedra fyziky
  • Anotace:
    Silné asymetrické měkké rentgenove záření v magnetickém pinči

The Vortex Structure of Langmuir Turbulence in the Interrupted Magnetic Z-pinch

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Prykarpatsky, A.
  • Publikace: Proceedings of 18th Symposium on Plasma Physics and Technology. Praha: ČVUT FEL, Katedra fyziky, 1997. pp. 102-105. ISBN 80-01-01641-2.
  • Rok: 1997

Thick Carbon Fibre Z-Pinch Diagnostics

  • Autoři: Davies, H., Lorenz, A., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Proceedings of 18th Symposium on Plasma Physics and Technology. Praha: ČVUT FEL, Katedra fyziky, 1997. pp. 64-68. ISBN 80-01-01641-2.
  • Rok: 1997

X-ray Diagnostics of Fiber Discharge in Small Pinches

  • Autoři: Jakubowski, L., Sadowski, M., Zebrowski, J., prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Pína, L.
  • Publikace: Proceedings of 18th Symposium on Plasma Physics and Technology. Praha: ČVUT FEL, Katedra fyziky, 1997. pp. 80-82. ISBN 80-01-01641-2.
  • Rok: 1997

X-Ray Lasing of Carbon Fiber

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J.
  • Publikace: Proceedings of 18th Symposium on Plasma Physics and Technology. Praha: ČVUT FEL, Katedra fyziky, 1997. pp. 96-101. ISBN 80-01-01641-2.
  • Rok: 1997

Diagnostics of Low Energy Carbon Fibre Z-Pinch

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J.
  • Publikace: Proceedings Beams'96. Praha: AV ČR, Ústav fyziky plazmatu, 1996. pp. 737-740. ISBN 80-902250-4-7.
  • Rok: 1996

Evolution of Gas-Puff Z-pinch During Implosion and Pinch Phase

  • Autoři: Krejčí, A., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: IEEE Transactions on Plasma Science. 1996, 24(1), 22-23. ISSN 0093-3813.
  • Rok: 1996

Forming of the Plasmoids in the High Current Discharges at Atmospheric Pressure

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Karpinski, L., Paduch, M., Tomaszewski, K.
  • Publikace: Workshop 96. Praha: České vysoké učení technické v Praze, 1996. pp. 113-114.
  • Rok: 1996

Incoherent and Coherent X-rays Emission of Small Pinches

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J.
  • Publikace: Book of Abstracts TCM. Praha: AV ČR, Ústav fyziky plazmatu, 1996. pp. 4.
  • Rok: 1996

Magnetické pinče a jejich využití

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J.
  • Publikace: Sborník abstraktů - 12. konference českých a slovenských fyziků. Ostrava: VŠB-TUO, 1996. pp. 18.
  • Rok: 1996
  • Pracoviště: Katedra fyziky
  • Anotace:
    Přehled magnetických pinčů

Mechanism of Hot Spots Formation in Magnetic Z-pinch

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J.
  • Publikace: Proceedings Beams'96. Praha: AV ČR, Ústav fyziky plazmatu, 1996. pp. 162-169. ISBN 80-902250-3-9.
  • Rok: 1996
  • Pracoviště: Katedra fyziky
  • Anotace:
    Diagnostika rentgenovych zdroju

Nové výzkumy v jaderné fúzi

  • Autoři: prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Proceedings of the 9th Regional Conference IUAPPA - 3rd International Conference, Environmental Impact Assessment, Vol.1. Praha: České vysoké učení technické v Praze, 1996. pp. 53-63. ISBN 80-01-01513-0.
  • Rok: 1996

Two Steps in the Gas-Puff Z-Pinch

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Krejčí, A., Koláček, K., Tomaszewski, K., Paduch, M.
  • Publikace: Workshop 96. Praha: České vysoké učení technické v Praze, 1996. pp. 115-116.
  • Rok: 1996

Compression Time of the Gas Puff Z-pinch

Diagnostics of Conical Electrode Z-pinch Discharge at High Pressure

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Karpinski, L., Padsch, M., Tomazsewski, K.
  • Publikace: Plasma95. Warsaw: IPPLM, 1995. pp. 63-66.
  • Rok: 1995

Dynamics of Plasma Columu during GAS-PUFF Z-pinch Implosion and Delay

  • Autoři: Krejčí, A., Koláček, K., Rauš, J., Řípa, M., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: 17th Symposium on Plasma Physics and Technology, Book of Abstracts. Praha: ČVUT FEL, Katedra fyziky, 1995. pp. 107-109.
  • Rok: 1995

Interaction of Thermal Plasma Jet with the Stream of Jujected Liquid

  • Autoři: Hrabovský, M., Konrád, M., Kopecký, V., Sember, V., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Proceedings of 12. International Symposium on Plasma Chemistry. Mineapolis: Mineapolis, 1995. pp. 1719-1724. ISBN 1-887976-5.
  • Rok: 1995

Magnetic Z-pinch Stable Structure Study

  • Pracoviště: Katedra fyziky
  • Anotace:
    Diagnostika magnetického pinče

Organised Structures in Magnetic Pinches

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J., Koláček, K., Krejčí, A., Rauš, J., Paduch, M., Tomazsewski, K.
  • Publikace: 17th Symposium on Plasma Physics and Technology. Praha: ČVUT FEL, Katedra fyziky, 1995. pp. 110-112. ISBN 80-01-01344-8.
  • Rok: 1995

Structure of Mixing Zone of Thermal Plasma Jet

  • Autoři: Hrabovský, M., Konrád, M., Kopecký, V., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Proceedings of 17th Symposium on Plasma Physics and Technology. Praha: ČVUT FEL, Katedra fyziky, 1995. pp. 179-181. ISBN 80-01-01344-8.
  • Rok: 1995

Study of Ions and Electrical Emitted Axially from Low-Energy Z-pinch Discharges in Nitrogen and Argon

  • Autoři: Sadowski, M., Szydlowski, A., Baranowski, J., prof. RNDr. Pavel Kubeš, CSc., Kravárik, J.
  • Publikace: 17th Symposium on Plasma Physics and Technology. Praha: ČVUT FEL, Katedra fyziky, 1995. pp. 135-137. ISBN 80-01-01344-8.
  • Rok: 1995

Study of the Conical Electrode Magnetic Field Configuration

Time-Resolved Diagnostics of Fast Ions in Low Energy Z-pinch with Conical Electrode Configuration

X-ray Generation in Gas-puff Z-Pinch

  • Autoři: prof. RNDr. Pavel Kubeš, CSc., Kravárik, J.
  • Publikace: Proceedings of the 1996 ICPP. Nagoya: National Institute for Fusion Science, 1995. pp. 1102-1105. ISBN 4-9900586-2-3.
  • Rok: 1995
  • Pracoviště: Katedra fyziky
  • Anotace:
    Diagnostika plasmatu s vysokou energii

Z-pinch Studies at the Czech Republic

Diagnostics and Dynamics of the Z-pinch

Elektrotechnika a životní prostředí

Laser, Optical and X-ray Plasma Diagnostics of z-Pinch

Magnetic Z-pinch Stable Structure Study

Optic Diagnostic Devices for Pulse Discharge Plasma

Pinč v hustém plazmatu

Stable Structure in the Interrupted z-pinch

Study of the Plasmoid in the Interrupted Z-pinch

Thin Bubbles at Low Pressures

Vlastnosti implose plasmatu typu Z-pinč

Diagnostics of the Interrupted Z-pinch

Interrupted Z-pinch in Argon

MHD Model of the Gas Embedded Interrupted Z-pinch

Observation of the Jets in the Gas Embedded Interrupted Z-pinch

Plasma Driven Implosions of a Bubble

  • Autoři: Bortolotti, A., Linhart, J., Kravárik, J., prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Proceedings of the 3rd Int. Conf. Dense Z-pinches. Philadelphia: American Institute of Physics, 1993. pp. 372-380. ISBN 1-56396-297-7.
  • Rok: 1993

Some Problems of Plasma Pinch Research

Vyřeší jaderná fuze problém energie

  • Autoři: prof. RNDr. Pavel Kubeš, CSc.,
  • Publikace: Sborník z konference "Hodnocení vlivu hospodářské činnosti na životní prostředí". Praha: České vysoké učení technické v Praze, 1993. pp. 59-63.
  • Rok: 1993

Z-pinch Discharge Turbulent Energy Considerations

Z-Pinch Plasma Jet

Za stránku zodpovídá: Ing. Mgr. Radovan Suk