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Gas dynamics and thermal-ionization instability of the cathode region of a glow discharge. Part II

  • Gas Discharges, Plasma
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Abstract

The influence of the gas flow structure in the cathode sheath of a glow discharge on the discharge stability is studied numerically. The electric parameters are calculated in a diffusion-drift model that consistently takes into account associative dissociation as an additional electron source. The model also includes equations describing both the thermal mode of the cathode and the nonequilibrium physicochemical gas dynamics of a moderately rarefied gas. It is shown that, in a pulsed discharge, the increasing branch of the current-voltage characteristic, which is associated with the gas rarefaction behind the cathode shock wave, can change to a descending branch associated with the intensification of associative ionization. This gives rise to cathode sheath instability. The results of calculations agree well with experiments.

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Authors and Affiliations

  1. Efremov Research Institute of Electrophysical Apparatus, St. Petersburg, 189631, Russia

    S. A. Smirnov & G. A. Baranov

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  1. S. A. Smirnov
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  2. G. A. Baranov
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Translated from Zhurnal Tekhnichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Fiziki, Vol. 71, No. 7, 2001, pp. 39–43.

Original Russian Text Copyright © 2001 by Smirnov, Baranov.

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Smirnov, S.A., Baranov, G.A. Gas dynamics and thermal-ionization instability of the cathode region of a glow discharge. Part II. Tech. Phys. 46, 825–830 (2001). https://doi.org/10.1134/1.1387541

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