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Title: Comment on “Two-dimensional positive column structure in a discharge tube with radius discontinuity” [Phys. Plasmas 21, 113503 (2014)]

Zobnin et al. have published a paper [Phys. Plasmas, 21, 113503 (2014)] on a topic of discharge physics in the presence of a sharp change in cylindrical discharge geometry. In the comment it is pointed out that for untrapped electrons a full kinetic equation, which includes dependences on spatial coordinates and energies, has to be used for the electron velocity distribution function determination. It is also unclear what probe theories Zobnin et al. have used in their paper for the calculation of electron current to the discharge tube wall.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [4] ; ;  [6]
  1. Department of Chemistry, Wright State University, Dayton, Ohio 45435 (United States)
  2. (United States)
  3. Division of NLP Technology, INTEPH Technology LLC, Dayton, Ohio 45066 (United States)
  4. (Russian Federation)
  5. International Laboratory “Nonlocal Plasma in Nanotechnology and Medicine”, ITMO University, Kronverkskiy pr. 49, St. Petersburg 197101 (Russian Federation)
  6. Department of Optics, St. Petersburg State University, St. Petersburg 199034 (Russian Federation)
Publication Date:
OSTI Identifier:
22493797
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 9; 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; CYLINDRICAL CONFIGURATION; DISTRIBUTION FUNCTIONS; ELECTRONS; ENERGY DEPENDENCE; GAS DISCHARGE TUBES; KINETIC EQUATIONS; PLASMA; POSITIVE COLUMN; PROBES; SPACE DEPENDENCE; TWO-DIMENSIONAL SYSTEMS; VELOCITY