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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2021, Volume 113, Issue 4, Pages 256–262
DOI: https://doi.org/10.31857/S1234567821040066
(Mi jetpl6366)
 

This article is cited in 12 scientific papers (total in 12 papers)

PLASMA, HYDRO- AND GAS DYNAMICS

Initiation of explosive electron emission and runaway of electrons during pulsed breakdown of dense gases

N. M. Zubarevab, G. A. Mesyatsba

a Institute for Electrophysics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620016 Russia
b Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991 Russia
References:
Abstract: A mechanism for the initiation of explosive electron emission at the interface between the cathode and a dense gas is proposed. It is based on the accumulation of positive ions, which appear in the gas ionized by field-emission electrons, near natural microprotrusions. The distance at which ions appear decreases with increasing gas density, which leads to an increase in their Coulomb field on the emitting surface. As a result, the emission current density in a high-pressure gas (tens of atmospheres) increases explosively, leading to the formation of many explosive-emission centers in tens of picoseconds. They initiate the development of plasma channels growing toward the anode. Runaway electrons are generated at the tops of the plasma tips and ionize the gas, providing its subnanosecond breakdown. This scenario of the breakdown development can be implemented at a critically low reduced electric field (i.e., the ratio of its strength to the pressure), when the characteristic time of avalanche multiplication of thermal electrons is longer than the duration of the voltage pulse.
Funding agency Grant number
Russian Foundation for Basic Research 20-08-00172
Russian Science Foundation 19-79-30086
N.M. Zubarev acknowledges the partial support of the Russian Foundation for Basic Research (project no. 20-08-00172). G.A. Mesyats acknowledges the partial support of the Russian Science Foundation (project no. 19-79-30086).
Received: 24.12.2020
Revised: 31.12.2020
Accepted: 01.01.2021
English version:
Journal of Experimental and Theoretical Physics Letters, 2021, Volume 113, Issue 4, Pages 259–264
DOI: https://doi.org/10.1134/S0021364021040123
Bibliographic databases:
Document Type: Article
Language: Russian
Citation: N. M. Zubarev, G. A. Mesyats, “Initiation of explosive electron emission and runaway of electrons during pulsed breakdown of dense gases”, Pis'ma v Zh. Èksper. Teoret. Fiz., 113:4 (2021), 256–262; JETP Letters, 113:4 (2021), 259–264
Citation in format AMSBIB
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\paper Initiation of explosive electron emission and runaway of electrons during pulsed breakdown of dense gases
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\pages 256--262
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  • This publication is cited in the following 12 articles:
    Citing articles in Google Scholar: Russian citations, English citations
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