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In recent years, the generation of beams of runaway electrons has been the subject of increasing interest; see review [1] and references in [1]. It was shown that in atmospheric pressure air, the FWHM of the beam current pulse is 0.1 ns at a generator voltage ranging to over 100 kV, and the amplitude of the beam current downstream of the gas diode foil can reach 100 A [2]. The number of fast electrons...
In our work, we performed experiments to examine the conditions under which a runaway electron beam moves not only toward the anode but also backward (to the space downstream of the cathode). In the experiments, a SLEP-150 generator was used which allowed us to obtain 6·1010 electrons in atmospheric pressure air downstream of an Al foil anode 10 m thick [1]. The design of the SLEP-150 generator is...