Effect of helium irradiation on trapping and thermal release of deuterium implanted in tungsten

S. Nagata, K. Takahiro

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Retention and thermal release of D atoms and lattice disorder in W single crystals pre-irradiated with He were studied by ion beam analysis techniques. The retention of 1 keV D ions implanted in W crystals was strongly enhanced by the 10 keV 4He pre-irradiation to a small dose where a large distortion was created at room temperature. The total amount of D retained in near surface layer of the W crystal did not vary with a range of He pre-implantation dose between 1019 He/m2 and 1021 He/m2. However, the lattice disorder was significantly accumulated in near surface layer above 1021 He/m2 and the thermal release of retained D atoms occurred at higher temperature. For a specimen pre-irradiated at 850 K, the crystal lattice was not heavily damaged, and trapping sites for the D atoms were uniformly distributed in the He implanted region probably owing to ordered He bubbles.

Original languageEnglish
Pages (from-to)135-139
Number of pages5
JournalJournal of Nuclear Materials
Volume290-293
DOIs
Publication statusPublished - 2001 Mar

ASJC Scopus subject areas

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

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