Vertical Profiles and Radial Locations of He II and C IV Line Emissions Observed at Different Toroidal Angles in LHD
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概要
- 論文の詳細を見る
Vertical profiles of edge impurity line emissions of He II and C IV have been measured at different toroidal locations of Large Helical Device (LHD) by scanning horizontally a space-resolved EUV spectrometer in order to observe the edge distribution at different poloidal locations. Radial location of He II with ionization energy of Ei = 54.4 eV reflects the penetration depth of neutral helium and radial location of C IV with Ei = 64.5 eV expresses the index of plasma edge boundaryin ergodic layer of LHD. The result indicates that the radial position of He II is located at inner side than that of C IV, whereas the ionization energy of He II is smaller than that of C IV. It is found that the radial position of He II estimated from the C IV position has a nearly constant distance of 4 mm from the plasma edge against different poloidal locations including region near X-points. The distance is in a good agreement with analysis assumed neutral helium influx with room temperature (300 K). It suggests that the neutral helium mainly enter the plasma as background gas in the vacuum vessel, but not as recycling particle.
- 社団法人 プラズマ・核融合学会の論文
著者
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MORITA Shigeru
Department of Dairy Science, Rakuno Gakuen University
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Kobayashi Masahiro
Department Of Chest Surgery Kitakyushu City Yahata Hospital
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DONG Chunfeng
National Institute for Fusion Science, Toki 509-5292, Japan
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GOTO Motoshi
Department of Fusion Science, Graduate University for Advanced Studies
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WANG Erhui
Department of Fusion Science, Graduate University for Advanced Studies
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