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Abstract <p>Numerical kinetic modeling of spherically expanding plasma with parameters characteristic of the plasma of the cathode spot of a low-current vacuum arc is performed. It is shown that under such conditions a group of electrons arises in the plasma, the energy of which practically does not change during expansion. As a result, at some distance from the cathode, the electron velocity distribution function in the direction of plasma expansion differs significantly from the drifted Maxwell distribution by the presence of a group of suprathermal electrons. The distribution function for velocities perpendicular to the direction of expansion remains Maxwellian.</p>

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Suprathermal Electrons in Expanding Plasma of Vacuum Arc Jet

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • D. L. Shmelev,
  • S. A. Barengolts,
  • I. V. Uimanov

摘要

Abstract

Numerical kinetic modeling of spherically expanding plasma with parameters characteristic of the plasma of the cathode spot of a low-current vacuum arc is performed. It is shown that under such conditions a group of electrons arises in the plasma, the energy of which practically does not change during expansion. As a result, at some distance from the cathode, the electron velocity distribution function in the direction of plasma expansion differs significantly from the drifted Maxwell distribution by the presence of a group of suprathermal electrons. The distribution function for velocities perpendicular to the direction of expansion remains Maxwellian.