Runaway electron beam generation by a plasma cathode in atmospheric air discharge |
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Authors: | D S Mastyugin V V Osipov V I Solomonov |
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Affiliation: | 1.Institute of Electrophysics, Ural Division,Russian Academy of Sciences,Yekaterinburg,Russia |
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Abstract: | Electron beam generation in atmospheric air discharge with a flat cathode has been experimentally studied. The discharge was
excited by voltage pulses of negative polarity with an amplitude of 220 kV, a full width at half maximum of 2 ns, and a leading
front width of 0.7 ns. The electron beam was monitored using luminescence of a layer of ZnS-CdS:Ag phosphor placed behind
a 20-μm-thick foil anode. It was found that the intensity and homogeneity of luminescence of the phosphor layer increased
when a dielectric tube with a length smaller than half of the interelectrode distance was placed in the near-cathode part
of the air gap. It is concluded that a plasma cathode is formed within the volume confined by the tube and electrons emitted
from this region are accelerated in the open part of the gap. In addition, the dielectric tube decreases the divergence of
the electron beam. |
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