Spectra of electrons and X-ray photons in a diffusive nanosecond discharge in air under atmospheric pressure |
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Authors: | E H Baksht A G Burachenko A V Kozyrev I D Kostyrya M I Lomaev V K Petin D V Rybka V F Tarasenko and S V Shljakhtun |
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Institution: | 1.Institute of High-Current Electronics, Siberian Branch,Russian Academy of Sciences,Tomsk,Russia |
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Abstract: | The spectra of electrons and X-ray photons generated in nanosecond discharges in air under atmospheric pressure are investigated
theoretically and experimentally. Data for the discharge formation dynamics in a nonuniform electric field are gathered. It
is confirmed that voltage pulses with an amplitude of more than 100 kV and a rise time of 1 ns or less causing breakdown of
an electrode gap with a small-radius cathode generate runaway electrons, which can be divided into three groups in energy
(their energy varies from several kiloelectronvolts to several hundreds of kiloelectronvolts). It is also borne out that the
formation of the space charge is due to electrons appearing in the gap at the cathode and a major contribution to the electron
beam behind the foil comes from electrons of the second group, the maximal energy of which roughly corresponds to the voltage
across the gap during electron beam generation. X-ray radiation from the gas-filled diode results from beam electron slowdown
both in the anode and in the gap. It is shown that the amount of group-3 electrons with an energy above the energy gained
by runaway electrons (in the absence of losses) at a maximal voltage across the gap is much smaller than the amount of group-2
electrons. |
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