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Plasma flow crisis and the limiting electron temperature in a vacuum arc in axial magnetic field

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Abstract

The possibility of supersonic motion of cathode plasma in a low-current vacuum arc in an axial magnetic field has been studied. It is shown that an increase in the electron temperature unavoidably leads to a plasma flow crisis, whereby the plasma velocity decreases to the sound velocity. The dependence of the limiting length of a stationary flow on the magnetic field has been studied. The maximum possible electron temperature T cr in the plasma is determined by the initial ion energy and can be estimated as T cr ≈ 3T m, where T m is the maximum electron temperature in the cathode spot region.

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  1. Irkutsk State University, Irkutsk, Russia

    I. A. Krinberg

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  1. I. A. Krinberg
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Translated from Pis’ma v Zhurnal Tekhnichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Fiziki, Vol. 31, No. 6, 2005, pp. 89–94.

Original Russian Text Copyright © 2005 by Krinberg.

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Krinberg, I.A. Plasma flow crisis and the limiting electron temperature in a vacuum arc in axial magnetic field. Tech. Phys. Lett. 31, 261–263 (2005). https://doi.org/10.1134/1.1894452

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  • DOI: https://doi.org/10.1134/1.1894452

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