Effect of oxygen on hydrogen retention in W deposition layers formed by hydrogen RF plasma

Toshiya Fujiki, Kazunari Katayama, Sansiro Kasahara, Satoshi Fukada, Masabumi Nishikawa

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

In the vessel of a fusion reactor, co-deposition layers are formed by plasma-wall interactions. It has been reported by the present authors that a large amount of hydrogen can be trapped in tungsten deposition layers formed by hydrogen plasma sputtering depending on the experimental condition. In the present study, the influence of oxygen on hydrogen behavior in tungsten deposition layers was investigated. Overall, hydrogen retention increased with increasing oxygen concentration. The tungsten deposition layer containing oxygen of 1.69 as O/W retained hydrogen of 0.70 as H/W, which is larger than the value of H/W (around 0.1) in the deposition layer containing no oxygen. It was observed that some amounts of hydrogen were released as water vapor from the deposition layer in which a large amount of oxygen was detected. A tungsten deposition layer containing a large amount of oxygen was spontaneously flaked off after plasma was turned off.

Original languageEnglish
Pages (from-to)1094-1097
Number of pages4
JournalFusion Engineering and Design
Volume85
Issue number7-9
DOIs
Publication statusPublished - Dec 2010

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

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