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    Wyświetlanie 1-5 z 5
    Tytuł:
    Neutron and fast ion emission from PF-1000 facility equipped with new large electrodes
    Autorzy:
    Szydlowski, M.
    Scholz, M.
    Karpinski, L.
    Sadowski, M.
    Tomaszewski, K.
    Paduch, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/147301.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    fast ion beam
    neutron emission anisotropy
    neutron yield
    plasma focus
    Opis:
    A PF-1000 facility was operated for the first time at an energy level of up to 1 MJ. The maximal emission of 2×1011 neutrons/shot was registered. Relatively low emission anisotropy was observed. Fast ion beams were generated only from shots performed at a low filling pressure (1-2 Torr).
    Źródło:
    Nukleonika; 2001, 46, suppl. 1; 61-64
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recent progress in 1 MJ Plasma-Focus research
    Autorzy:
    Scholz, M.
    Karpiński, L.
    Paduch, M.
    Tomaszewski, K.
    Miklaszewski, R.
    Szydlowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/147553.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    neutron emission
    plasma focus
    scaling laws
    soft X-ray radiation
    Opis:
    The paper reports on actual operational characteristics of the PF-1000 facility and it presents results of the first neutron experiments performed with a new set of large Mather-type electrodes, which were designed for shots up to 1000 kJ. Dynamics of a current-sheath was studied by means of two high-speed streak cameras and a two-frame camera. The last one was used for the side-on observation of the pinch column. The high-speed streak pictures were taken side-on behind slits oriented in the radial or axial direction. On the basis of the pictures taken behind the radial slit, average values of the radial compression and expansion velocities were estimated. Time-resolved X-ray signals were measured with PIN diodes covered by different filters, and they were compared with other traces (voltage waveforms, dI/dt signals, and neutron-induced pulses) in order to determine their correlation. The total neutron yield (Ytot), i.e. the number of neutrons produced during a single discharge and emitted in various directions, was measured by means of several silver-activation detectors placed at different angles around the PF-1000 experimental chamber.
    Źródło:
    Nukleonika; 2001, 46, 1; 35-39
    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:
    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:
    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 1-5 z 5

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