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Title: Is the negative glow plasma of a direct current glow discharge negatively charged?

A classic problem in gas discharge physics is discussed: what is the sign of charge density in the negative glow region of a glow discharge? It is shown that traditional interpretations in text-books on gas discharge physics that states a negative charge of the negative glow plasma are based on analogies with a simple one-dimensional model of discharge. Because the real glow discharges with a positive column are always two-dimensional, the transversal (radial) term in divergence with the electric field can provide a non-monotonic axial profile of charge density in the plasma, while maintaining a positive sign. The numerical calculation of glow discharge is presented, showing a positive space charge in the negative glow under conditions, where a one-dimensional model of the discharge would predict a negative space charge.
Authors:
;  [1] ;  [2] ;  [1] ;  [3]
  1. Faculty of Physics, St. Petersburg State University, 198504 St. Petersburg (Russian Federation)
  2. Department of Physics and Astronomy, West Virginia University, Morgantown, West Virginia 26506 (United States)
  3. (Russian Federation)
Publication Date:
OSTI Identifier:
22408165
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 2; Other Information: (c) 2015 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; CHARGE DENSITY; DIRECT CURRENT; ELECTRIC FIELDS; GLOW DISCHARGES; ONE-DIMENSIONAL CALCULATIONS; PLASMA; POSITIVE COLUMN; SPACE CHARGE; TWO-DIMENSIONAL SYSTEMS