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Abstract

Wall conditioning and deposition of low Z materials on the first wall and limiters play an important role in plasma impurity control. A film containing boron and carbon is expected to show more resistance to chemical erosion and could also getter the oxygen. After boronisation of the TCA tokamak, the plasma is found to be free of heavy impurities and the edge power radiation, representative of the light impurities, decreases by a factor of 4. The smaller loop voltage allows a gain of 60% of the current flat top length. Clean deuterium and hydrogen plasmas are obtained following different glow discharge cleaning. The boronisation film is found to hold more working gas than the unboronised plasma vessel.

Additional information

Authors: DUDOK DE WIT T, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, Lausanne (CH);DUVAL B P, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, Lausanne (CH);HOLLENSTEIN C, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, Lausanne (CH);JOYE B, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, Lausanne (CH)
Bibliographic Reference: Paper presented : 17th EPS Conference on Controlled Fusion and Plasma Heating, Amsterdam (NL), June 25-29, 1990
Availability: Available from (1) as Paper EN 35297 ORA
Record Number: 199011565 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en