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Abstract

The conditioning of the plasma facing wall in thermonuclear confinement experiments has been performed very successfully by the application of amorphous boron-containing hydrogenated carbon films. Boronisation leads to tokamak discharges with significantly reduced oxygen and carbon contaminations. For high heat flux components (especially in future quasi-stationary confinement experiments) new boron/carbon materials will have to be developed: monolithic tiles of boronated graphites which can be brazed to watercooled substrates or thick B(4)C-coatings on graphite or high-Z coolant tubes. A variety of bulk materials (boronated graphites with boron contents ranging from 3 - 30%, so-called coat mix material on the basis of B(4)C) and coatings (amorphous B/C films, thick B(4)C layers applied by LPPS or CVD methods) have been characterised systematically. In addition, the behaviour of these materials has been investigated under thermal loads. Erosion and disruption simulation experiments were performed in electron and ion beam high heat flux test facilities. Physical and chemical sputtering of the coat mix material was studied in the PISCES-B facility.

Additional information

Authors: LINKE J ET AL., Institut für Plasmaphysik, Kernforschungsanlage Jülich GmbH, Jülich (DE);BOLT H, NET Team, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);DOERNER R, University of California, Los Angeles (US);HIROOKA Y, University of California, Los Angeles (US);SEKI M, JAERI, Naka-gun (JP);WEBER T, Technical University, Aachen (DE)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 176 & 177 (1990) pp. 856-863
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