Wall Conditioning Effects of Large Helical Device.
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- OHUCHI Takezo
- Department of Nuclear Engineering, Faculty of Engineering, Hokkaido University
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- HIROHATA Yuko
- Department of Nuclear Engineering, Faculty of Engineering, Hokkaido University
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- HINO Tomoaki
- Department of Nuclear Engineering, Faculty of Engineering, Hokkaido University
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- INOUE Noriyuki
- National Institute of Fusion Science
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- SAGARA Akio
- National Institute of Fusion Science
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- NODA Nobuaki
- National Institute of Fusion Science
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- MOTOJIMA Osamu
- National Institute of Fusion Science
Bibliographic Information
- Other Title
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- 大型ヘリカル装置(Large Helical Device)プラズマ対向壁の壁洗浄効果
- オオガタ ヘリカル ソウチ Large Helical Device プラズマ タイコウヘキ ノ カベ センジョウ コウカ
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Abstract
For Large Helical Device, LHD, first cycle and second cycle experiments were conducted in 1998. Before each cycle experiments, SS316L samples were installed at the inner wall along poloidal direction. After the experiments, these samples were extracted, and the changes of surface morphology, atomic composition and gas desorption were investigated.<BR>After the first cycle experiments, dominant erosion and deposition of wall materials were observed, and the oxygen impurity level at the surface was considerably large. After the second cycle experiments, erosion and deposition almost disappeared, and the thickness of oxide layer largely decreased. In addition, the amount of desorbed impurity gas was reduced, compared with the case of first cycle experiments. In the second cycle experiments, it was seen that the plasma stored energy largely increased due to the reduction of the radiation power. The impurity level at the inner wall was largely reduced by the second cycle experiments.
Journal
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- Shinku
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Shinku 43 (3), 223-226, 2000
The Vacuum Society of Japan
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Keywords
Details 詳細情報について
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- CRID
- 1390001204063757056
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- NII Article ID
- 10004561571
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- NII Book ID
- AN00119871
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- ISSN
- 18809413
- 05598516
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- NDL BIB ID
- 5360865
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed