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Title: Mechanism of Runaway Electron Generation at Gas Pressures from a Few Atmospheres to Several Tens of Atmospheres

Abstract

The mechanism of runaway electron generation at gas pressures from a few atmospheres to several tens of atmospheres is proposed. According to this mechanism, the electrons pass into the runaway mode in the enhanced field zone that arises between a cathode micropoint—a source of field-emission electrons—and the region of the positive ion space charge accumulated near the cathode in the tails of the developing electron avalanches. As a result, volume gas ionization by runaway electrons begins with a time delay required for the formation of the enhanced field zone. This process determines the delay time of breakdown. The influence of the gas pressure on the formation dynamics of the space charge region is analyzed. At gas pressures of a few atmospheres, the space charge arises due to the avalanche multiplication of the very first field-emission electron, whereas at pressures of several tens of atmospheres, the space charge forms as a result of superposition of many electron avalanches with a relatively small number of charge carriers in each.

Authors:
;  [1]
  1. Russian Academy of Sciences, Institute of Electrophysics, Ural Branch (Russian Federation)
Publication Date:
OSTI Identifier:
22763280
Resource Type:
Journal Article
Journal Name:
Plasma Physics Reports
Additional Journal Information:
Journal Volume: 44; Journal Issue: 4; Other Information: Copyright (c) 2018 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-780X
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CATHODES; CATIONS; ELECTRON EMISSION; FIELD EMISSION; IONIZATION; RUNAWAY ELECTRONS; SPACE CHARGE; TOWNSEND DISCHARGE

Citation Formats

Zubarev, N. M., E-mail: nick@iep.uran.ru, and Ivanov, S. N., E-mail: stivan@iep.uran.ru. Mechanism of Runaway Electron Generation at Gas Pressures from a Few Atmospheres to Several Tens of Atmospheres. United States: N. p., 2018. Web. doi:10.1134/S1063780X18040104.
Zubarev, N. M., E-mail: nick@iep.uran.ru, & Ivanov, S. N., E-mail: stivan@iep.uran.ru. Mechanism of Runaway Electron Generation at Gas Pressures from a Few Atmospheres to Several Tens of Atmospheres. United States. doi:10.1134/S1063780X18040104.
Zubarev, N. M., E-mail: nick@iep.uran.ru, and Ivanov, S. N., E-mail: stivan@iep.uran.ru. Sun . "Mechanism of Runaway Electron Generation at Gas Pressures from a Few Atmospheres to Several Tens of Atmospheres". United States. doi:10.1134/S1063780X18040104.
@article{osti_22763280,
title = {Mechanism of Runaway Electron Generation at Gas Pressures from a Few Atmospheres to Several Tens of Atmospheres},
author = {Zubarev, N. M., E-mail: nick@iep.uran.ru and Ivanov, S. N., E-mail: stivan@iep.uran.ru},
abstractNote = {The mechanism of runaway electron generation at gas pressures from a few atmospheres to several tens of atmospheres is proposed. According to this mechanism, the electrons pass into the runaway mode in the enhanced field zone that arises between a cathode micropoint—a source of field-emission electrons—and the region of the positive ion space charge accumulated near the cathode in the tails of the developing electron avalanches. As a result, volume gas ionization by runaway electrons begins with a time delay required for the formation of the enhanced field zone. This process determines the delay time of breakdown. The influence of the gas pressure on the formation dynamics of the space charge region is analyzed. At gas pressures of a few atmospheres, the space charge arises due to the avalanche multiplication of the very first field-emission electron, whereas at pressures of several tens of atmospheres, the space charge forms as a result of superposition of many electron avalanches with a relatively small number of charge carriers in each.},
doi = {10.1134/S1063780X18040104},
journal = {Plasma Physics Reports},
issn = {1063-780X},
number = 4,
volume = 44,
place = {United States},
year = {2018},
month = {4}
}