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    Wyświetlanie 1-8 z 8
    Tytuł:
    Refined design of a new driver for fast capillary discharge
    Autorzy:
    Koláček, K.
    Boháček, V.
    Šunka, P.
    Řípa, M.
    Kravárik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148339.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    fast capillary discharge
    soft X-ray laser
    Opis:
    A new driver of the fast capillary discharge has been designed. It consists of the Marx generator and radial Blumline pulse forming line. Such a geometry enables axial access to both capillary ends (”transparent capillary”). This arrangement substantially simplifies the experiments (adjustment, monitoring, applications). The designed apparatus is capable of reaching the discharge current of the order of 120 kA and the discharge current rise time 2.9×1012 A/s, which is sufficient for the investigation of amplification in non-traditional electronic transitions.
    Źródło:
    Nukleonika; 2001, 46, suppl. 1; 45-47
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Refined design of a new driver for fast capillary discharge
    Autorzy:
    Kolácek, K.
    Bohacek, V.
    Schmidt, J.
    Sunka, P.
    Ripa, M.
    Kravárik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147571.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    fast capillary discharge
    soft X-ray laser
    Opis:
    A new driver of the fast capillary discharge has been designed. It consists of the Marx generator and radial Blumline pulse forming line. Such a geometry enables axial access to both capillary ends ("transparent capillary"). This arrangement substantially simplifies the experiments (adjustment, monitoring, applications). The designed apparatus is capable of reaching the discharge current of the order of 120 kA and the discharge current rise time 2.9×1012 A/s, which is sufficient for the investigation of amplification in non-traditional electronic transitions.
    Źródło:
    Nukleonika; 2001, 46, 3; 117-120
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evolution of the small ball-like structures in the plasma focus discharge
    Autorzy:
    Cikhardtova, B.
    Kubes, P.
    Cikhardt, J.
    Paduch, M.
    Zielinska, E.
    Kravarik, J.
    Rezac, K.
    Kortanek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/146922.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    dense plasma focus (DPF)
    interferometric diagnostics
    organized structures in plasma
    plasmoids
    Opis:
    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 identifi ed 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 fi lled 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 1024 to 1025 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.
    Źródło:
    Nukleonika; 2016, 61, 2; 155-159
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temporal distribution of linear densities of the plasma column in a plasma focus discharge
    Autorzy:
    Cikhardtova, B.
    Kubeš, P.
    Cikhardt, J.
    Paduch, M.
    Zielinska, E.
    Kravárik, J.
    Řezáč, K.
    Kortanek, J.
    Šíla, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/147356.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    plasma focus (PF)
    plasma pinch
    plasma diagnostics
    Opis:
    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.
    Źródło:
    Nukleonika; 2015, 60, 2; 315-318
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy transformation in Plasma Focus discharge with wire and liner as a load
    Autorzy:
    Kubeš, P.
    Kravárik, J.
    Klír, D.
    Scholz, M.
    Paduch, M.
    Tomaszewski, K.
    Karpinski, L.
    Ryc, L.
    Juha, L.
    Krasa, J.
    Szydlowski, A.
    Romanova, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/147107.pdf
    Data publikacji:
    2002
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    plasma focus
    X-ray source
    XUV spectroscopy
    Opis:
    We present the results of experiments focused on energy transformations during the implosion of the hydrogen current sheath towards an Al wire (120 ěm in diameter) positioned on the top of the inner electrode of the PF-1000 plasma focus facility at the IPPLM in Warsaw. A wire corona is formed at the current sheath impact and ~60 ns after the impact a soft X-ray pulse is emitted. Its spectrum contains AlVI-XII lines accompanied by their satellites. The amount of emitted energy is recorded by two filtered PIN diodes and thermoluminescent dosimeters and depends on symmetry of the current sheath and quality of the current sheath focus. The mean value of energy of keV photons emitted in the runs done without the wire (~1 J) is higher than the energy obtained with the wire (~0.4 J). A time delay between the impact of the current sheath and X-ray pulse, the plasma focus dynamics and soft X-ray emission are interpreted by an axial magnetic field generation and transformations.
    Źródło:
    Nukleonika; 2002, 47, 4; 151-153
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Status of a mega-joule scale Plasma-Focus experiments
    Autorzy:
    Scholz, M.
    Bieńkowska, B.
    Borowiecki, M.
    Ivanova-Stanik, I.
    Karpiński, L.
    Stępniewski, W.
    Paduch, M.
    Tomaszewski, K.
    Sadowski, M.
    Szydłowski, A.
    Kubeš, P.
    Kravárik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147496.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    plasma focus
    dense magnetized plasma
    neutron yield
    Opis:
    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. Particular attention has been paid to pinch evolution, the emission of pulsed X-ray, fast electron beams, and fusion produced neutrons. Some theoretical models of the initial breakdown, which occurs at the insulator surface, are compared. It is pointed out that modeling of the breakdown is sensitive to kinetics of ionization processes and transport coefficients. Progress in experimental studies of the axial acceleration phase is unsatisfactory. Important experimental data have been collected, but new measurements are still needed. For the radial collapse phase, it was shown that the MHD modeling is efficient until the maximum compression, but plasma instabilities require more sophisticated approaches. The pinch phase was investigated by means of different diagnostics. Fusion neutron yields were measured in different experiments, but some discrepancies in scaling must still be explained. The conclusions concern directions for further studies and optimization of large-scale high-current PF facilities.
    Źródło:
    Nukleonika; 2006, 51, 1; 79-84
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interferometry of the plasma focus equipped with forehead cathode
    Autorzy:
    Kubeš, P.
    Klír, D.
    Rezac, K.
    Paduch, M.
    Pisarczyk, T.
    Scholz, M.
    Chodukowski, T.
    Kalinowska, Z.
    Hitschfel, J.
    Kortanek, J.
    Kravárik, J.
    Ivanova-Stanik, I.
    Bienkowska, B.
    Karpinski, L.
    Zielinska, E.
    Sadowski, M. J.
    Tomaszewski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/147512.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    interferometry
    neutron diagnostics
    plasma focus discharge
    Opis:
    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.
    Źródło:
    Nukleonika; 2012, 57, 2; 189-192
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stabilizing of Z-pinch and Plasma Focus discharges due to thick wires
    Autorzy:
    Kubeš, P.
    Kravárik, J.
    Paduch, M.
    Tomaszewski, K.
    Scholz, M.
    Karpinski, L.
    Szydlowski, A.
    Bakshaev, Y.
    Blinov, P.
    Chernenko, A. S.
    Gordeev, E. M.
    Dan’ko, S. A.
    Korolev, V. D.
    Shashkov, A.
    Tumanov, V. I.
    Romanova, V.
    Klír, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/146991.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    plasma focus
    X-ray source
    XUV spectroscopy
    Z-pinch
    Opis:
    This paper presents the results of the diagnostics observing the impact of the plasma sheath imploded in megaamper Z-pinch or plasma focus devices onto the Al or C wires of 30-300 mi m in diameter fixed in the center axis. The discharges were operated with a maximum current of 1.5-3 MA at two devices, PF 1000 at IPFLM in Warsaw, and Stand 300 at RRC Kurchatov Institute in Moscow. At the plasma impact the 10-50 ns XUV pulse was emitted in K-shell lines from the ring or helical-like forms on the surface of the wire corona. The scenario of the production of the non-equilibrium intensities of the C and Al H-like and He-like lines is discussed considering fast transformation of magnetic field, electron beams acceleration, total ionization of the ions and fast recombination in dense and magnetized wire corona.
    Źródło:
    Nukleonika; 2001, 46, 1; 5-7
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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