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Title: Measurements of low-energy electron reflection at a plasma boundary

It is demonstrated that low-energy (<3 eV) electron reflection from a solid surface in contact with a low-temperature plasma can have significant variation with time. An uncontaminated, i.e., “clean,” metallic surface (just after heating up to glow) in a plasma environment may have practically no reflection of low-energy incident electrons. However, a contaminated, i.e., “dirty,” surface (in some time after cleaning by heating) that has a few monolayers of absorbent can reflect low-energy incident electrons and therefore significantly affect the net electron current collected by the surface. This effect may significantly change plasma properties and should be taken into account in plasma experiments and models. A diagnostic method is demonstrated for measurements of low-energy electron absorption coefficient in plasmas with a mono-energetic electron group.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [5] ;  [6]
  1. Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433 (United States)
  2. (United States)
  3. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)
  4. Department of Physics and Astronomy, West Virginia University, Morgantown, West Virginia 26506 (United States)
  5. Department of Optics and Spectroscopy, St. Petersburg State University, St. Petersburg 199034 (Russian Federation)
  6. (Russian Federation)
Publication Date:
OSTI Identifier:
22486499
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 10; 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; ABSORBENTS; ABSORPTION; COLD PLASMA; CURRENTS; EV RANGE; PLASMA DIAGNOSTICS; REFLECTION; SURFACES; TAIL ELECTRONS