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Title: Determination of the coefficient of reflection of metastable argon atoms from the discharge tube wall

Radial profiles of the density of metastable atoms Ar({sup 3}P{sub 2}) in the positive column of a dc glow discharge in argon were measured. Gas-discharge glass tubes with clean inner surfaces and surfaces covered with a carbonitride or carbon film were utilized. The parameters of the discharge plasma under experimental conditions were calculated in the framework of a one-dimensional (along the tube radius) discharge model. The coefficient K of reflection of Ar({sup 3}P{sub 2}) atoms from the tube wall was estimated by comparing the measured and calculated density profiles. It is found that, for a clean tube wall, the coefficient of reflection is K = 0.4 ± 0.2, whereas for a wall covered with a carbonitride or carbon film, it is K < 0.2.
Authors:
 [1] ; ;  [2]
  1. St. Petersburg State University (Russian Federation)
  2. Troitsk Institute for Innovation and Fusion Research (Russian Federation)
Publication Date:
OSTI Identifier:
22472333
Resource Type:
Journal Article
Resource Relation:
Journal Name: Plasma Physics Reports; Journal Volume: 41; Journal Issue: 5; Other Information: Copyright (c) 2015 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ARGON; ATOMS; CARBON; COMPARATIVE EVALUATIONS; FILMS; GLOW DISCHARGES; PLASMA; PLASMA DENSITY; PLASMA RADIAL PROFILES; POSITIVE COLUMN; REFLECTION; SURFACES