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    Wyświetlanie 1-4 z 4
    Tytuł:
    Recent measurements of soft X-ray emission from the DPF-1000U facility
    Autorzy:
    Surała, W.
    Sadowski, M. J.
    Paduch, M.
    Zielinska, E.
    Tomaszewski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/148171.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    plasma focus
    X-ray emission
    X-ray images
    gas puffing
    filaments
    hot spots
    Opis:
    Soft X-ray imaging is a very useful diagnostic technique in plasma-focus (PF) experiments. This paper reports results of four experimental sessions which were carried out at the DPF-1000U plasma-focus facility in 2013 and 2014. Over 200 discharges were performed at various experimental conditions. Measurements were taken using two X-ray pinhole cameras with a line of sight perpendicular to the z-axis, at different azimuthal angles (about 20° and 200°), and looking towards the centre of the PF-pinch column. They were equipped with diaphragms 1000 μm or 200–300 μm in diameter and coated with filters of 500 μm Al foil and 10 μm Be foil, respectively. Data on the neutron emission were collected with silver activation counters. For time-resolved measurements the use was made of four PIN diodes equipped with various fi lters and oriented towards the centre of the PF-column, in the direction perpendicular to the electrode axis. The recorded X-ray images revealed that when the additional gas-puff system is activated during the discharge, the stability of the discharge is improved. The data collected in these experiments confi rmed the appearance of a filamentary fi ne structure in the PF discharges. In the past years the formation of such fi laments was observed in many Z-pinch type experiments. Some of the recorded X-ray images have also revealed the appearance of the so-called hot- -spots, i.e. small plasma regions of a very intense X-ray emission. Such a phenomenon was observed before in many PF experiments, e.g. in the MAJA-PF device, but it has not been investigated so far in a large facility such as the DPF-1000U. The time-resolved measurements provided the evidence of a time lapse between the X-ray emission from plasma regions located at different distance from the anode surface. The formation of distinct ‘hot-spots’ in different instants of the DPF-1000U discharge was also observed.
    Źródło:
    Nukleonika; 2015, 60, 2; 303-308
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time-integrated diagnostics of X-ray emission from PALS and PF 1000 : preliminary results
    Autorzy:
    Ryć, L.
    Krása, J.
    Juha, L.
    Kaczmarczyk, J.
    Paduch, M.
    Parys, P.
    Tomaszewski, K.
    Scholz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/148024.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    high-temperature plasma
    semiconductor detector
    thermoluminescent detector
    X-ray diagnostics
    Opis:
    Thermoluminescent and semiconductor detectors operating in an integrating mode have been applied to the measurement of X-ray flashes of high intensity from large plasma facilities. A detection head of special kind has been developed to perform comparison measurements with the use of the detectors of both kinds.
    Źródło:
    Nukleonika; 2001, 46, suppl. 1; 41-43
    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:
    PF-6 an effective plasma focus as a source of ionizing radiation and plasma streams for application in material technology, biology and medicine
    Autorzy:
    Gribkov, V.
    Dubrovsky, A.
    Scholz, M.
    Jednorog, S.
    Karpiński, L.
    Tomaszewski, K.
    Paduch, M.
    Miklaszewski, R.
    Pimenov, V.
    Ivanov, L. I.
    Dyomina, E. V.
    Maslyaev, S. A.
    Orlova, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/147424.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    dense plasma focus (DPF)
    ion beam
    plasma beam
    X-ray beams
    surface damage
    microlithography
    radioenzymology
    positron emission tomography (PET)
    Opis:
    A review of results on the design and operation of the new efficient Dense Plasma Focus device PF-6 of medium size (transportable) having bank energy of ca. 7 kJ and possessing a long lifetime is presented. New data on the interaction of the pulsed fast ion beams and dense plasma streams generated at this apparatus with various materials are given. These results are compared with the analogous information received at the biggest facility PF-1000. It is shown that it is possible to have about the same power flux density (in the range of 105 109 W/cm2) in both devices however in different areas. Doses of soft X-rays produced by the device within the resists for the goals of microlithography and micromachining appear to be several times less that it is with the conventional X-ray tube. In biological application of this device, medium- and hard-energy X-rays are exploited in the field of radioenzymology. It was found that the necessary dose producing activation/inactivation of enzymes can be by several orders of magnitude lower if used at a high-power flux density in comparison with those received with isotope sources. In medicine, short-life isotope production for the goals of the positron emission tomography (medicine diagnostics) is possible by means of the fast ions generated within DPF. All these experiments are discussed in the framework of pulsed radiation physics and chemistry in its perfect sense thereto the criteria are formulated.
    Źródło:
    Nukleonika; 2006, 51, 1; 55-62
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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