Formation of graphite re-deposition layer by hydrogen RF plasma

Kazunari Katayama, H. Nagase, Y. Manabe, Y. Kodama, T. Takeishi, M. Nishikawa

研究成果: ジャーナルへの寄稿Conference article

10 引用 (Scopus)

抄録

It has been revealed that a graphite re-deposition layer is formed in a fusion plasma device and can trap fuel atoms when a carbon-based material is applied as a plasma facing component. However, there are not sufficient data for quantitative prediction of hydrogen and carbon behavior with the formation of the re-deposition layer under several plasma conditions. We produced a graphite re-deposition layer on quartz substrates by a sputtering method using hydrogen RF plasma. The re-deposition layer was approximately uniformly formed on the substrate located on the ground electrode, but in some experimental conditions no deposition was observed there. This is due to the effect of re-sputtering by the incident hydrogen ions. It was found that the layer formed on and around the ground electrode had a dense columnar structure and a packed fibrous structure, respectively. With varying RF power or hydrogen pressure, the H/C ratio changed between approximately 0.1 and 0.45, and is considerably larger than that for absorption into graphite bulk. This indicates that the formation of graphite re-deposition layer makes tritium inventory in a D-T fusion reactor to dramatically grow. The plasma parameters in each experimental condition were investigated by the Langmuir probe method.

元の言語英語
ページ(範囲)151-157
ページ数7
ジャーナルThin Solid Films
457
発行部数1
DOI
出版物ステータス出版済み - 6 1 2004
イベント16th Symposium on Plasma Science for Materials (SPSM-16) - Tokyo, 日本
継続期間: 6 4 20036 5 2003

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Graphite
Hydrogen
graphite
Plasmas
hydrogen
Grounding electrodes
Sputtering
Carbon
sputtering
Plasma devices
Langmuir probes
Quartz
electrodes
Tritium
fusion reactors
carbon
Fusion reactors
Substrates
electrostatic probes
hydrogen ions

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

これを引用

Katayama, K., Nagase, H., Manabe, Y., Kodama, Y., Takeishi, T., & Nishikawa, M. (2004). Formation of graphite re-deposition layer by hydrogen RF plasma. Thin Solid Films, 457(1), 151-157. https://doi.org/10.1016/j.tsf.2003.12.030

Formation of graphite re-deposition layer by hydrogen RF plasma. / Katayama, Kazunari; Nagase, H.; Manabe, Y.; Kodama, Y.; Takeishi, T.; Nishikawa, M.

:: Thin Solid Films, 巻 457, 番号 1, 01.06.2004, p. 151-157.

研究成果: ジャーナルへの寄稿Conference article

Katayama, K, Nagase, H, Manabe, Y, Kodama, Y, Takeishi, T & Nishikawa, M 2004, 'Formation of graphite re-deposition layer by hydrogen RF plasma', Thin Solid Films, 巻. 457, 番号 1, pp. 151-157. https://doi.org/10.1016/j.tsf.2003.12.030
Katayama, Kazunari ; Nagase, H. ; Manabe, Y. ; Kodama, Y. ; Takeishi, T. ; Nishikawa, M. / Formation of graphite re-deposition layer by hydrogen RF plasma. :: Thin Solid Films. 2004 ; 巻 457, 番号 1. pp. 151-157.
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AB - It has been revealed that a graphite re-deposition layer is formed in a fusion plasma device and can trap fuel atoms when a carbon-based material is applied as a plasma facing component. However, there are not sufficient data for quantitative prediction of hydrogen and carbon behavior with the formation of the re-deposition layer under several plasma conditions. We produced a graphite re-deposition layer on quartz substrates by a sputtering method using hydrogen RF plasma. The re-deposition layer was approximately uniformly formed on the substrate located on the ground electrode, but in some experimental conditions no deposition was observed there. This is due to the effect of re-sputtering by the incident hydrogen ions. It was found that the layer formed on and around the ground electrode had a dense columnar structure and a packed fibrous structure, respectively. With varying RF power or hydrogen pressure, the H/C ratio changed between approximately 0.1 and 0.45, and is considerably larger than that for absorption into graphite bulk. This indicates that the formation of graphite re-deposition layer makes tritium inventory in a D-T fusion reactor to dramatically grow. The plasma parameters in each experimental condition were investigated by the Langmuir probe method.

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