[Table of Contents]

Plasma and Fusion Research

Volume 7, 2402090 (2012)

Regular Articles

Deuterium Retention in Graphite and its Removal by Inert Gas Glow Discharge
Akira MATSUMOTO, Yuji YAMAUCHI, Tomoaki HINO, Kiyohiko NISHIMURA1) and Yoshio UEDA2)
Hokkaido University, Kita-13, Nishi-8, Kita-ku, Sapporo 060-8628, Japan
1)
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
2)
Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
(Received 9 December 2011 / Accepted 25 April 2012 / Published 26 July 2012)

Abstract

The hydrogen isotope retention and its removal by inert gas glow discharge for graphite was investigated by residual gas analysis. The amount of retained hydrogen isotope in graphite during the deuterium glow discharge was about 1.0 × 1017 cm2, which was one order of magnitude larger than that in 316L stainless steel or tungsten. The removal ratio of hydrogen isotope by helium, neon and argon glow discharge cleaning were 49%, 22% and 6% respectively. These removal ratios were similar to those for the stainless steel, but larger than the tungsten. The removal ratio in graphite can be explained by both the depth distribution of incident deuterium in the materials and the etching depth.

Keywords

graphite, wall conditioning, glow discharge cleaning, deuterium, deuterium removal

DOI: 10.1585/pfr.7.2402090

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References

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This paper may be cited as follows:

Akira MATSUMOTO, Yuji YAMAUCHI, Tomoaki HINO, Kiyohiko NISHIMURA and Yoshio UEDA, Plasma Fusion Res. 7, 2402090 (2012).