Ultrashort electron beam and volume high-current discharge in air under the atmospheric pressure |
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Authors: | V F Tarasenko S B Alekseev V M Orlovskii V G Shpak S A Shunailov |
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Institution: | (1) Institute of High-Current Electronics, Siberian Division, Russian Academy of Sciences, Tomsk, 634055, Russia;(2) Institute of Electrophysics, Ural Division, Russian Academy of Sciences, Yekaterinburg, 620016, Russia |
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Abstract: | Conditions are studied under which an electron beam and a volume discharge with a subnanosecond rise time of a voltage pulse
are produced in air under atmospheric pressure. It is shown that the electron beam appears in a gas-filled diode at the front
of the voltage pulse in ~0.5 ns, has a half-intensity duration of ≤0.4 ns and an average electron energy of ~0.6 of the voltage
across the gas-filled diode, and terminates when the voltage across the gap reaches its maximum value. The electron beam with
an average electron energy of 60 to 80 keV and a current amplitude of ≥70 A is obtained. It is assumed that the electron beam
is formed from electrons produced in the gap due to gas ionization by fast electrons when the intensity of the field between
the front of the expanding plasma cloud and the anode reaches its critical value. A nanosecond volume discharge with a specific
power input of ≥400 MW/cm3, a density of the discharge current at the anode of up to 3 kA/cm2, and specific energy deposition of ~1 J/cm3 over 3 to 5 ns is created. |
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