1. Chemical Impurity Production in the Tokamak de Varennes
- Author
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W. Zuzak, Dennis Whyte, Barry L. Stansfield, B. Terreault, Gilles Bourque, H. D. Pacher, B.C. Gregory, and G.W. Pacher
- Subjects
chemistry.chemical_classification ,Tokamak ,Materials science ,020209 energy ,General Engineering ,Analytical chemistry ,chemistry.chemical_element ,02 engineering and technology ,Plasma ,01 natural sciences ,Spectral line ,010305 fluids & plasmas ,law.invention ,chemistry ,law ,Impurity ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Compounds of carbon ,Graphite ,Emission spectrum ,Carbon - Abstract
Plasma contamination due to the generation of impurity molecules has been studied by mass spectrometry and by visible emission spectroscopy in the Tokamak de Varennes. The dominant effects are carbon monoxide formation, which is correlated with the residual water vapor pressure in the vacuum chamber, and the formation of C{sub 1}, C{sub 2}, and C{sub 3} hydrocarbons. The measured molecular fluxes are sufficient to account for a large part of the plasma impurity content. Visible spectroscopy indicates that the plasma is significantly affected by these chemical impurity sources. The molecules appear to originate mainly from the stainless steel walls rather than from the graphite limiters.
- Published
- 1990
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