Deuterium and helium release and microstructure of tungsten deposition layers formed by RF plasma sputtering

Kazunari Katayama, K. Imaoka, M. Tokitani, M. Miyamoto, M. Nishikawa, Satoshi Fukada, N. Yoshida

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

It is important to evaluate tritium behavior in tungsten deposition layers considering a long-term plasma operation. In this study, tungsten deposition layers were formed by deuterium or helium RF plasma sputtering. The release behavior of deuterium or helium from the layers were observed by a thermal desorption method. When a tungsten deposition layer does not contain oxygen, the retained deuterium is mainly released as D2. When oxygen exists in the layer, the majority of deuterium is released as water vapor. Tungsten deposition layers have an amorphous structure and consist offline grain with size of 2-3 nm. Numerous bubbles are observed in the layers. A formation of tungsten deposition layer in a fusion reactor may make tritium control more difficult.

Original languageEnglish
Pages (from-to)549-552
Number of pages4
JournalFusion Science and Technology
Volume54
Issue number2
DOIs
Publication statusPublished - Jan 1 2008

Fingerprint

Helium
Tungsten
Deuterium
Sputtering
deuterium
tungsten
sputtering
helium
Plasmas
microstructure
Microstructure
Tritium
Oxygen
tritium
Thermal desorption
Fusion reactors
Steam
Water vapor
fusion reactors
oxygen

All Science Journal Classification (ASJC) codes

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

Cite this

Deuterium and helium release and microstructure of tungsten deposition layers formed by RF plasma sputtering. / Katayama, Kazunari; Imaoka, K.; Tokitani, M.; Miyamoto, M.; Nishikawa, M.; Fukada, Satoshi; Yoshida, N.

In: Fusion Science and Technology, Vol. 54, No. 2, 01.01.2008, p. 549-552.

Research output: Contribution to journalArticle

Katayama, Kazunari ; Imaoka, K. ; Tokitani, M. ; Miyamoto, M. ; Nishikawa, M. ; Fukada, Satoshi ; Yoshida, N. / Deuterium and helium release and microstructure of tungsten deposition layers formed by RF plasma sputtering. In: Fusion Science and Technology. 2008 ; Vol. 54, No. 2. pp. 549-552.
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