Investigation on modification of plasma facing surface under long duration discharges by means of a collector probe in TRIAM-1M

Takeshi Hirai, Kazutoshi Tokunaga, Tadashi Fujiwara, Naoaki Yoshida, Satoshi Itoh

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Metallic specimens mounted on a collector probe head were inserted in the scrape-off layer and exposed to long pulse tokamak plasma in TRIAM-1M. Strong radiation damage (formation of interstitial loops) was caused by high energy (>2 keV) charge-exchange hydrogen neutrals. The surfaces of the probe specimens were covered by new material made of co-deposited in-vessel elements such as Fe, Cr, Mo, O and C. The deposited layer was often exfoliated by blistering. These results indicate that energetic hydrogen neutrals and the co-deposition of impurities considerably change the surface properties of plasma facing components and even introduce new impurity sources.

Original languageEnglish
Pages (from-to)1060-1065
Number of pages6
JournalJournal of Nuclear Materials
Volume258-263
Issue numberPART 1 A
DOIs
Publication statusPublished - Jan 1 1998

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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