Effects of Boronization in LHD
- 1 January 2003
- journal article
- Published by Japan Society of Plasma Science and Nuclear Fusion Research in Journal of Plasma and Fusion Research
- Vol. 79 (12), 1216-1217
- https://doi.org/10.1585/jspf.79.1216
Abstract
Boronization (boron coating) using diborane was carried out in the Large Helical Device (LHD) for wall conditioning. Using three nozzles for the diborane supply, about 60 % area of the vacuum chamber was covered by boron film. Oxygen impurity radiation was strongly reduced by gettering, and radiation from carbon and metals were reduced about 30 - 40 % by coverage with boron film. As a result, radiation loss was reduced and the operational density exceeded 1·10 20 cm -3 , which is about twice of that before boronization.Keywords
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