Abstract
The formation of a beam of runaway electrons in a diode filled with helium at a pressure from 0.1 to 760 Torr was studied under conditions of a pulsed ≈4 ns) high ≈200 kV) voltage applied to the discharge gap. Both theoretical results and experimental data indicate that the electron beam is generated both at a large strength of the electric field, when the fraction of runaway electrons is large, and in a field of low strength, where intensive electron multiplication takes place. In the latter case, a high current can be obtained despite a small fraction of runaway electrons relative to their total number. The electron beams obtained in the helium-filled diode had a current amplitude of up to 140 A (corresponding to a current density above 10 A/cm2) at an electron energy of ∼150 keV.
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Translated from Pis’ma v Zhurnal Tekhnichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 29, No. 16, 2003, pp. 45–53.
Original Russian Text Copyright © 2003 by Alekseev, Orlovski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \), Tarasenko, Tkachev, Yakovlenko.
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Alekseev, S.B., Orlovskii, V.M., Tarasenko, V.F. et al. Electron beam formation in helium at elevated pressures. Tech. Phys. Lett. 29, 679–682 (2003). https://doi.org/10.1134/1.1606787
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DOI: https://doi.org/10.1134/1.1606787