Technical Physics Letters

, Volume 41, Issue 1, pp 43–45 | Cite as

The role of the ambipolar field and the local approximation inapplicability in determination of the electron distribution function at high pressures

  • K. D. Kapustin
  • M. B. Krasil’nikov
  • A. A. Kudryavtsev
Article
  • 22 Downloads

Abstract

It is demonstrated that the condition for applicability of the local approximation in solving the kinetic equation for electrons includes not only smallness of the electron kinetic relaxation length as compared with the characteristic plasma volume, but also smallness of the ambipolar filed as compared with the current (heating) field. Therefore, at the discharge periphery, where the ambipolar field exceeds the longitudinal one, the local approximation cannot be used for calculating the electron distribution function even at high gas pressures.

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Copyright information

© Pleiades Publishing, Ltd. 2015

Authors and Affiliations

  • K. D. Kapustin
    • 2
  • M. B. Krasil’nikov
    • 1
  • A. A. Kudryavtsev
    • 1
  1. 1.St. Petersburg State UniversitySt. PetersburgRussia
  2. 2.St. Petersburg State University of Information Technologies, Mechanics, and OpticsSt. PetersburgRussia

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