Systematic investigation of the formation behavior of helium bubbles in tungsten

M. Miyamoto, S. Mikami, H. Nagashima, N. Iijima, D. Nishijima, R. P. Doerner, N. Yoshida, H. Watanabe, Y. Ueda, A. Sagara

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Abstract The formation of He bubbles in tungsten under exposure to a He plasma was systematically investigated using low energy (∼50 eV) He+ ions with a wide fluence range (∼1023 to 1026 m-2) in the linear divertor plasma simulator PISCES-A at several temperatures (523-973 K). TEM observations after thinning exposed W samples with FIB revealed that the layer thickness (>30 nm) of He bubbles largely exceeds the ion implantation range of a few nm. The size of He bubbles was found to increase with an increase in the sample temperature: it was around 10 nm at 973 K, while only small He bubbles of 1-2 nm were observed at <773 K. In addition, to obtain information on the initial formation behavior, in-situ TEM observations during He ion irradiation were also performed.

Original languageEnglish
Article number48703
Pages (from-to)333-336
Number of pages4
JournalJournal of Nuclear Materials
Publication statusPublished - Jul 22 2015

All Science Journal Classification (ASJC) codes

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


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