Journal
PHYSICS OF PLASMAS
Volume 22, Issue 2, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.4907192
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Funding
- RNF [14-19-00311]
- SPbGU [11.38.658.2013]
- ITMO [713577]
- Russian Science Foundation [14-19-00311] Funding Source: Russian Science Foundation
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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. (C) 2015 AIP Publishing LLC.
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