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Title: Electron heating during discharges driven by thermionic emission

The heating of plasma electrons during discharges driven by thermionic emission is studied using one-dimensional particle-in-cell Monte Carlo collisions modeling that self-consistently takes the dependence of the thermionic current on the plasma parameters into account. It is found that at a gas pressure of 10{sup 2‚ÄČ}Pa the electron two-stream instability is excited. As a consequence, the electrostatic plasma wave propagates from the cathode to the anode. The trapping of electrons by this wave contributes noticeably to the heating of the plasma. At a larger gas pressure, this instability is not excited. As a consequence, plasma electrons are heated only because of the generation of energetic electrons in ionization events and the scattering of emitted electrons.
Authors:
 [1] ;  [2]
  1. LAPLACE (Laboratoire Plasma et Conversion d'Energie), Universite de Toulouse, UPS, INPT Toulouse, 118 route de Narbonne, F-31062 Toulouse Cedex 9 (France)
  2. Department of Physics, Technion, 32000 Haifa (Israel)
Publication Date:
OSTI Identifier:
22403245
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COLLISIONS; HEATING; MONTE CARLO METHOD; ONE-DIMENSIONAL CALCULATIONS; PLASMA WAVES; SCATTERING; SIMULATION; TAIL ELECTRONS; THERMIONIC EMISSION; TRAPPING; TWO-STREAM INSTABILITY