Journal of Plasma and Fusion Research
Print ISSN : 0918-7928
Rapid Communications
Effects of Boronization in LHD
Kiyohiko NISHIMURA, Naoko ASHIKAWA, Akio SAGARA, Nobuaki NODA, Kazuo KAWAHATA, Shigeru MORITA, Byron J. PETERSON, Satoru SAKAKIBARA, Yasuhiko TAKEIRI, Kenji TANAKA, Kuninori SATO, Akio KOMORI, LHD Experimental Group
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Keywords: boronization, diborane, wall conditioning, impurity, radiation loss, operational density regime, LHD
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2003 Volume 79 Issue 12 Pages 1216-1217

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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 1×1020 cm-3, which is about twice of that before boronization.

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© 2003 by The Japan Society of Plasma Science and Nuclear Fusion Research
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