Deposits removal and hydrogen release on co-deposited films exposed to O-ICR and O-GDC plasmas in HT-7

J. S. Hu, J. G. Li, N. Ashikawa, K. Tokunaga, N. Noda, N. Yoshida

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A few new results of oxidation wall conditionings for deposits removal and hydrogen release were directly obtained on exposure of co-deposited films to O-ICR or O-GDC plasmas in HT-7. After the O-ICR or O-GDC treatments, the deposits were partially removed and deuterium retention was reduced. D 2 release from samples was reduced by a factor of 2-3, and the ratio of D/C decreased whereas that of O/C increased. The removal rates of C in various oxidation wall conditionings were about 1018-1019C m-2 min-1, which approached the estimated carbon deposited rates, of about 5.2 × 1018C m-2 min -1, on the tested samples. The He/O-ICR was more effective on the deposits removal and hydrogen (deuterium) release than O-GDC. And O-ICR was more effective on the surface facing main plasma than on that facing SOL plasma, whereas O-GDC possibly has uniform effectivity on both tested surfaces.

Original languageEnglish
Article number006
Pages (from-to)421-434
Number of pages14
JournalPlasma Physics and Controlled Fusion
Volume49
Issue number4
DOIs
Publication statusPublished - Apr 1 2007

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Deposits
deposits
conditioning
Deuterium
Plasmas
Hydrogen
deuterium
hydrogen
Oxidation
oxidation
Carbon
carbon

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

Deposits removal and hydrogen release on co-deposited films exposed to O-ICR and O-GDC plasmas in HT-7. / Hu, J. S.; Li, J. G.; Ashikawa, N.; Tokunaga, K.; Noda, N.; Yoshida, N.

In: Plasma Physics and Controlled Fusion, Vol. 49, No. 4, 006, 01.04.2007, p. 421-434.

Research output: Contribution to journalArticle

Hu, J. S. ; Li, J. G. ; Ashikawa, N. ; Tokunaga, K. ; Noda, N. ; Yoshida, N. / Deposits removal and hydrogen release on co-deposited films exposed to O-ICR and O-GDC plasmas in HT-7. In: Plasma Physics and Controlled Fusion. 2007 ; Vol. 49, No. 4. pp. 421-434.
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