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

10 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

All Science Journal Classification (ASJC) codes

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

Fingerprint Dive into the research topics of 'Deuterium and helium release and microstructure of tungsten deposition layers formed by RF plasma sputtering'. Together they form a unique fingerprint.

  • Cite this