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.
- Faculty of Physics, St. Petersburg State University, 198504 St. Petersburg (Russian Federation)
- Department of Physics and Astronomy, West Virginia University, Morgantown, West Virginia 26506 (United States)
- (Russian Federation)
- Publication Date:
- OSTI Identifier:
- 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
- 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