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D
) in JT-60UNakano, Tomohide; Higashijima, Satoru; Kubo, Hirotaka; Yagyu, Junichi; Arai, Takashi; Asakura, Nobuyuki; Itami, Kiyoshi
Journal of Nuclear Materials, 313-316(1-3), p.149 - 152, 2003/03
Times Cited Count：29 Percentile：85.55(Materials Science, Multidisciplinary)In JT-60U, boronization using hydride-decaborane (BD) was performed to reduce oxygen impurity and particle recycling. A problem of the boronization was that hydrogen originating from hydride-decaborane diluted core deuterium plasmas. In order to minimize the number of conditioning tokamak discharges, boronization using deuterated-decaborane (BD) has been introduced recently. In order to investigate durability of the boronization effects, discharges with an identical condition were repeated. Boronization using 20 g of deuterated-decaborane could reduce a core oxygen content from 
1.9% to only 1.3% in L-mode discharges with a neutral beam heating power of 4 MW. Boronization using 70 g of deuterated-decaborane reduced the core oxygen content from 2.2% to 0.5%. After the boronization using 70 g of deuterated-decaborane ( thickness of the Boron layer 135 nm ), the core oxygen content increased gradually from 0.5% to 1% in 400 shots.
Saido, Masahiro; Yagyu, Junichi; Yamamoto, Shunya; Goppelt-Langer, P.*; Aoki, Yasushi; Takeshita, Hidefumi; Naramoto, Hiroshi
Dai-4-Kai TIARA Kenkyu Happyokai Yoshishu, 0, p.44 - 45, 1995/00
no abstracts in English
Saido, Masahiro; Ando, Toshiro
Proc. of Japan-US Workshop P243 on High Heat Flux Components and Plasma Surface Interactions for Next, 0, p.107 - 118, 1995/00
no abstracts in English
