High Ion Temperature Plasmas using an ICRF Wall-Conditioning Technique in the Large Helical Device
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- TAKAHASHI Hiromi
- National Institute for Fusion Science
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- OSAKABE Masaki
- National Institute for Fusion Science
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- MURAKAMI Sadayoshi
- Department of Nuclear Engineering, Kyoto University
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- NAGAOKA Kenichi
- National Institute for Fusion Science
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- NAKANO Haruhisa
- National Institute for Fusion Science
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- TAKEIRI Yasuhiko
- National Institute for Fusion Science
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- SEKI Tetsuo
- National Institute for Fusion Science
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- SAITO Kenji
- National Institute for Fusion Science
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- KASAHARA Hiroshi
- National Institute for Fusion Science
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- KAMIO Shuji
- National Institute for Fusion Science
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- MUTOH Takashi
- National Institute for Fusion Science
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- the LHD Experiment Group
- National Institute for Fusion Science
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A new effective wall-conditioning technique was proposed for realizing high ion temperature (Ti) plasmas in the Large Helical Device using the ion cyclotron range of frequency (ICRF) wave under the established magnetic confinement field. A series of ICRF heating discharges using He as the working gas was conducted ahead of the high-Ti plasma discharges. After sufficient repetitive wall-conditioning discharges, we observed a decrease in the line-averaged electron density, the formation of a peaked electron density profile, a reduction in the Hα emission, and an increase in the central Ti. The results suggest that the stored hydrogen inside the vacuum vessel structures, such as the first wall, the diverter, and other components, sputtered out owing to the He plasmas of the ICRF wall-conditioning discharges and the hydrogen recycling was decreased. Consequently, the ion heating power of NBI increased in the plasma core region, leading to higher central Ti.
収録刊行物
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- Plasma and Fusion Research
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Plasma and Fusion Research 9 (0), 1402050-1402050, 2014
一般社団法人 プラズマ・核融合学会
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詳細情報 詳細情報について
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- CRID
- 1390282680231296768
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- NII論文ID
- 130005088367
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- NII書誌ID
- AA12346675
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- ISSN
- 18806821
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- HANDLE
- 10655/00013425
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- IRDB
- Crossref
- CiNii Articles
- KAKEN
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- 使用不可