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    Wyświetlanie 1-6 z 6
    Tytuł:
    The role of anomalous resistivities in Plasma Focus discharges
    Autorzy:
    Bruzzone, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/148185.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    anomalous resistivity
    pinches
    plasma focus
    Opis:
    The existence of plasma microturbulence in Plasma Focus (PF) devices is a widely accepted fact within the PF community. This microturbulence must be generated as a final stage of microscopic instabilities, which could develop during certain phases of the plasma evolution. Among the candidate instabilities to occur in these devices, the lower hybrid drift instability is the one with better possibilities, because its triggering condition (electron drift velocity approaching ion thermal velocity) has reasonable chances to be fulfilled. The main effect of the development of this instability is the modification of the collision frequencies in the plasma, which adds an anomalous term to the plasma resistivity. The theory for evaluating this extra term exists, and has been already used in PF 1D numerical simulations and in Z-pinch calculations. The role of this anomalous resistivity in PF behaviour has been the subject of considerable speculations. In this work, a 1D MHD (magnetohydrodynamics) calculation of the pinch stage in a PF device will be presented, including anomalous resistivity effects and their influence on electric fields and the discharge current are discussed.
    Źródło:
    Nukleonika; 2001, 46, suppl. 1; 3-7
    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
    Tytuł:
    Investigation of Plasma Focus discharges in the PF-360 facility with additional D2 gaspuffed targets
    Autorzy:
    Stanislawski, J.
    Baranowski, J.
    Sadowski, M.
    Zebrowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147013.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    current sheath
    deuteron beams
    gas puffing
    neutron yield
    plasma focus
    Opis:
    The paper describes experimental studies of Plasma-Focus (PF) discharges carried out within the modernized PF- 360 facility, which was operated with an additional D2-gas puffing into the region of the collapsing current sheath and PF pinch formation, i.e. into space in front of the electrode outlet. The main aim of these studies was to increase a neutron yield from PF discharges by using fast deuteron beams, which are usually emitted from a pinch column and which can interact with additional D2-gas target.
    Źródło:
    Nukleonika; 2001, 46, suppl. 1; 73-75
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of Plasma-Focus discharges within the PF-360 facility equipped with needle D2O-ice target
    Autorzy:
    Baranowski, J.
    Jakubowski, L.
    Sadowski, M.
    Zebrowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147583.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    cryogenic target
    current sheath
    neutrons yield
    plasma focus
    X-ray
    Opis:
    The paper describes a new technique which has been investigated in order to overcome the neutron saturation effect and to increase the neutron yield from the plasma-focus (PF) discharges [1]. The PF-360 experimental facility was constructed at the Andrzej Soltan Institute for Nuclear Studies (IPJ) in Swierk, Poland in the late 70s [4, 5]. Recently in order to improve the neutron yield from the PF-360 machine, it was proposed to use a cryogenic deuterium target, which might be placed within the plasma-focus region. For this purpose, we have been made a needle-like cryogenic target covered with a thin „heavy-ice“ layer. A considerable increase in the average neutron yield (from 1.7×1010 to about 2.2×1010 neutrons/shot) has been achieved for 122 kJ PF discharges when the needle target top was placed at a distance of about 100 mm from the electrode ends.
    Źródło:
    Nukleonika; 2001, 46, suppl. 1; 69-71
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of Plasma-Focus discharges within the PF-360 facility equipped with a planar D2O-ice target
    Autorzy:
    Zebrowski, J.
    Baranowski, J.
    Jakubowski, L.
    Sadowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/147057.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    cryogenic target
    ion beams
    neutron yield
    plasma focus
    X-rays
    Opis:
    The paper reports on investigations of dense magnetized plasmas produced within a modernized PF-360 facility, which was operated with an additional planar cryogenic target placed in the front of the electrode outlet and covered with D2O-ice layers. The main aim of these studies was to overcome the neutron saturation effect and to increase the maximum neutron yield from PF discharges by using fast deuteron beams. Such beams are usually emitted from a pinch region and can produce fast neutrons from D-D reactions during their interactions with the additional target.
    Źródło:
    Nukleonika; 2001, 46, suppl. 1; 65-68
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultrafast X-ray introspective imaging of metallic objects using a Plasma Focus
    Autorzy:
    Moreno, C. H.
    Clausse, A.
    Martínez, J. F.
    Llovera, R.
    Tartaglione, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/146595.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    dense plasmas
    electrical discharges
    plasma focus
    X-ray imaging
    X-rays
    Opis:
    A compact-chamber 4.7 kJ, 30 kV, Plasma Focus operated in deuterium was used as a ultrafast high intensity radiation source for introspective radiographic imaging of metallic objects. The samples to be imaged were located outside the Plasma Focus chamber, about 1 m away from the chamber wall. A high-sensitivity, fast-response commercial radiographic film was used as a X-ray detector. Experimentally obtained images are presented showing a very high penetration power of the X-ray beam, demonstrating that the presented compact-chamber Plasma Focus is suited for introspective visualisation of pieces manufactured on metal.
    Źródło:
    Nukleonika; 2001, 46, suppl. 1; 33-34
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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