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    Wyświetlanie 1-6 z 6
    Tytuł:
    On tuning mechanisms of DPF devices
    Autorzy:
    Tsybenko, S.
    Miklaszewski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/146799.pdf
    Data publikacji:
    2000
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    instability
    nonlinear dynamics
    plasma focus
    Opis:
    A global instability theory of pinching plasmas allows us to justify the well-known empirical facts of the use of a mismatched dense plasma focus (DPF) and heavy inert gas admixtures. We assume that an instability of tangential discontinuity is responsible for the instability of a current-carrying plasma column. To inhibit development of a tangential discontinuity in a plasma focus, an array of insulator fibers or metallic wires placed on the anode near the axis of a discharge camera can be used.
    Źródło:
    Nukleonika; 2000, 45, 3; 163-165
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PF-1000 device
    Autorzy:
    Scholz, M.
    Miklaszewski, R.
    Gribkov, V.
    Mezzetti, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/146791.pdf
    Data publikacji:
    2000
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    dense plasma
    plasma focus
    Z-pinch
    Opis:
    The paper presents the megajoule plasma focus facility operated at IPPLM. In order to study plasma focus (PF) discharges several diagnostics tools have been prepared. The preliminary observations of current sheath motion, as well as measurements of the current signals are reported.
    Źródło:
    Nukleonika; 2000, 45, 3; 155-158
    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:
    Surface and bulk processes in materials induced by pulsed ion and plasma beams at Dense Plasma Focus devices
    Autorzy:
    Pimenov, V.
    Maslyaev, S.
    Ivanov, L.
    Dyomina, E.
    Gribkov, V.
    Dubrovsky, A.
    Scholz, M.
    Miklaszewski, R.
    Ugaste, U.
    Kolman, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/147498.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    plasma focus
    pulse irradiation
    surface damage
    Opis:
    A review of results and new data on the interaction of pulsed ion and dense plasma beams with metals in different Dense Plasma Focus (DPF) devices are presented. Different irradiation conditions with microsecond pulses of the power density in the range of 105 109 W/cm2 were applied. The most interesting thermal and radiation effects observed in both surface and bulk of the material positioned at the cathode part of the DPF device have been considered. Advanced directions of DPF use for scientific and applied problems of radiation material science were determined.
    Źródło:
    Nukleonika; 2006, 51, 1; 71-78
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of plasma interactions with tungsten targets in PF-1000U facility
    Autorzy:
    Ladygina, M. S.
    Skladnik-Sadowska, E.
    Zaloga, D. R.
    Sadowski, M. J.
    Kubkowska, M.
    Kowalska-Strzeciwilk, E.
    Krawczyk, N.
    Paduch, M.
    Miklaszewski, R.
    Garkusha, I. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/147524.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    plasma-surface interaction
    plasma streams
    tungsten
    plasma focus
    PF-1000U
    Opis:
    This paper presents results of experimental studies of tungsten samples of 99.95% purity, which were irradiated by intense plasma-ion streams. The behaviour of tungsten, and particularly its structural change induced by high plasma loads, is of great importance for fusion technology. The reported measurements were performed within a modifi ed PF-1000U plasma-focus facility operated at the IFPiLM in Warsaw, Poland. The working gas was pure deuterium. In order to determine the main plasma parameters and to study the behaviour of impurities at different instants of the plasma discharge, the optical emission spectroscopy was used. The dependence of plasma parameters on the initial charging voltage (16, 19 and 21 kV) was studied. Detailed optical measurements were performed during interactions of a plasma stream with the tungsten samples placed at the z-axis of the facility, at a distance of 6 cm from the electrode outlets. The recorded spectra showed distinct WI and WII spectral lines. Investigation of a target surface morphology, after its irradiation by intense plasma streams, was performed by means of an optical microscope. The observations revealed that some amounts of the electrodes material (mainly copper) were deposited upon the irradiated sample surface. In all the cases, melted zones were observed upon the irradiated target surface, and in experiments performed at the highest charging voltage there were formed some cracks.
    Źródło:
    Nukleonika; 2016, 61, 2; 149-153
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Damage and modification of materials produced by pulsed ion and plasma streams in Dense Plasma Focus device
    Autorzy:
    Pimenov, V. N.
    Demina, E. V.
    Ivanov, L. I.
    Gribkov, V. A.
    Dubrovsky, A. V.
    Ugaste, U.
    Laas, T.
    Scholz, M.
    Miklaszewski, R.
    Kolman, B.
    Tartari, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/147722.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    plasma focus
    pulse irradiation
    surface damage
    Opis:
    The Dense Plasma Focus (DPF) devices PF-1000, PF-6 and PF-5M working with different gases and in dissimilar irradiation modes were used to carry out experimental investigations of irradiation of a number of materials by powerful pulsed ion and high-temperature plasma streams. The materials under test were designed for application in structural and functional components of thermonuclear fusion devices with magnetic (MPC) and inertial (IPC) plasma confinement, as well as for working chambers of plasma and accelerator devices. The main features of the materials are low-activation and radiation-resistant properties. On the basis of the investigations a significant progress was achieved in understanding of dynamics of high-energy nano- and micro-second pulsed streams in DPF from one side as well as on the mechanisms of their influence upon materials under irradiation from the other one. We demonstrated that this approach can be useful for certain tests of plasma-facing materials (e.g. W for MPC and stainless steels for IPC) and of structural (construction) elements of the above-mentioned devices subjected to pulsed high-energy radiation streams. The results obtained suggest also that DPF devices can be used in new pulse technologies for material treatment by means of powerful nanosecond and microsecond pulses of plasma and ion streams.
    Źródło:
    Nukleonika; 2008, 53, 3; 111-121
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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