[Table of Contents]

Plasma and Fusion Research

Volume 8, 2405014 (2013)

Regular Articles

Tritium Retention on Stainless Steel Surface Exposed to Plasmas in LHD (II)
Masao MATSUYAMA, Shinsuke ABE, Yasushi ONO1), Kiyohiko NISHIMURA2), Naoko ASHIKAWA2), Yasuhisa OYA3), Kenji OKUNO3), Tomoaki HINO4) and Akio SAGARA2)
Hydrogen Iosotope Research Center, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan
1)
CRDNS, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan
2)
National Institute for Fusion Science, Toki 509-5292, Japan
3)
Radiochemistry Research Laboratory, Shizuoka University, Shizuoka 422-8529, Japan
4)
Laboratory of Plasma Physics and Engineering, Hokkaido University, Sapporo 060-8628, Japan
(Received 22 November 2012 / Accepted 30 January 2013 / Published 27 March 2013)

Abstract

Effects of plasma exposure for tritium retention have been studied using both samples of a plasma-exposed stainless steel and a bare stainless steel. It was seen that the plasma-exposed surface was covered with thin deposition layers. Constituent elements of the deposition layers mainly formed metallic oxides except for C and O, but a part of Fe and Mo was a metallic state. Both samples were simultaneously exposed to tritium gas at room temperature with no heat treatment, and a considerable increase in tritium retention was observed for the plasma-exposed sample. In addition, it was clarified that distribution of tritium retention on the plasma-exposed surface was non-uniform even exposure at room temperature. Increase in tritium retention and non-uniformity of tritium distribution were discussed from viewpoints of distribution and chemical states of constituent elements of the deposition layers.

Keywords

tritium retention, plasma exposure, deposition layer, β-ray-induced X-ray spectrometry

DOI: 10.1585/pfr.8.2405014

Full Text

PDF format (2.5Mbytes) PDF Download

References

  • [1] M. Matsuyama et al., J. Nucl. Mater. 417, 900 (2011).
  • [2] M. Matsuyama et al., Plasma Fusion Res. 7, 2405091 (2012).
  • [3] M. Matsuyama et al., J. Nucl. Mater. 290-293, 437 (2001).
  • [4] M. Matsuyama et al., Fusion Sci. Technol. 41, 505 (2002).

This paper may be cited as follows:

Masao MATSUYAMA, Shinsuke ABE, Yasushi ONO, Kiyohiko NISHIMURA, Naoko ASHIKAWA, Yasuhisa OYA, Kenji OKUNO, Tomoaki HINO and Akio SAGARA, Plasma Fusion Res. 8, 2405014 (2013).