Russian Physics Journal

, Volume 61, Issue 3, pp 439–444 | Cite as

Characteristics of the Plasma Generated by Primary Electrons at Lowered Pressure

  • S. P. NikulinEmail author

Plasma characteristics in the gap at lowered pressure in the presence of primary electrons are analyzed for the hydrodynamic model in the cold ion approximation. It is demonstrated that at a certain critical ionization level, the plasma state changes abruptly. The potential drop in the plasma can be not only more, but also less than ln(2)kTe/e, and hence the velocity of ions exiting from the plasma can be more or less than the Bohm velocity. For low ionization intensity and formation of the plasma with a high fraction of primary electrons, the velocity of secondary electron exiting from the plasma becomes equal to their thermal velocity, and their distribution differs significantly from the Boltzmann distribution.


plasma primary electrons secondary particles Boltzmann law 


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Authors and Affiliations

  1. 1.Institute of Electrophysics of the Ural Branch of the Russian Academy of SciencesEkaterinburgRussia
  2. 2.Ural Federal University Named after the First President of Russia B. N. YeltsinEkaterinburgRussia

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