Observation of the avalanche of runaway electrons in air in a strong electric field

The generation of an avalanche of runaway electrons is demonstrated for the first time in a laboratory experiment. Two flows of runaway electrons are formed sequentially in an extended air discharge gap at the stage of delay of a pulsed breakdown. The first, picosecond, runaway electron flow is emit...

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Published inPhysical review letters Vol. 109; no. 8; p. 085002
Main Authors Gurevich, A V, Mesyats, G A, Zybin, K P, Yalandin, M I, Reutova, A G, Shpak, V G, Shunailov, S A
Format Journal Article
LanguageEnglish
Published United States 20.08.2012
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Summary:The generation of an avalanche of runaway electrons is demonstrated for the first time in a laboratory experiment. Two flows of runaway electrons are formed sequentially in an extended air discharge gap at the stage of delay of a pulsed breakdown. The first, picosecond, runaway electron flow is emitted in the cathode region where the field is enhanced. Being accelerated in the gap, this beam generates electrons due to impact ionization. These secondary electrons form a delayed avalanche of runaway electrons if the field is strong enough. The properties of the avalanche correspond to the existing notions about the runaway breakdown in air. The measured current of the avalanche exceeds up to an order the current of the initiating electron beam.
ISSN:1079-7114
DOI:10.1103/physrevlett.109.085002