Plasma-wall interaction study towards the steady state operation

Mizuki Sakamoto, Yuta Higashizono, Hideki Zushi, Kazuo Nakamura, Kazuaki Hanada, Hiroshi Idei, Makoto Hasegawa, Younosuke Nakashima, Masayuki Tokitani, Mitsutaka Miyamoto, Kazutoshi Tokunaga, Shoji Kawasaki, Hisatoshi Nakashima, Tadashi Fujiwara, Aki Higashijima, Naoaki Yoshida, Kohnosuke Sato

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Various phenomena of plasma-wall interactions during long duration discharges in TRIAM-1M are investigated from macroscopic and microscopic viewpoints. It is found that the density dependence of the hydrogen neutral flux decay length is not very sensitive to the density (i.e. ne-0.2 ). Neutral transport through the scrape-off layer is important for structural formation of hydrogen recycling. The hydrogen retention in the co-deposited layer, which was obtained using a material probe during long duration discharges, is consistent with the global wall pumping rate estimated from particle balance analysis. The wall temperature and co-deposition play important roles on hydrogen re-emission and hydrogen absorption, respectively. Oxygen impurities should affect the erosion and deposition properties of the plasma-facing wall as well as the hydrogen retention property of the co-deposited layer. The co-deposition of hydrogen with molybdenum and the oxygen impurities both play important roles in the hydrogen recycling.

Original languageEnglish
Article numberS2009
JournalPlasma and Fusion Research
Publication statusPublished - 2010

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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