Dependence of EC-Driven Current on the EC-Wave Beam Direction in LHD
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概要
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Electron cyclotron current drive (ECCD) experiments were conducted in the Large Helical Device to investigate the characteristics of EC-driven current and its profile and the possibility of controlling current and rotational transform profiles by ECCD. Successful ECCD helps prevent magnetohydrodynamic instabilities in plasmas. Scanning the EC-wave beam direction with a long pulse width of 8 s revealed a systematic change in the plasma current. The current's direction was reversed by a reversal of the beam direction. The direction agrees with the prediction of Fisch-Boozer theory regarding EC-wave beam injection from low-field side. The maximum driven current is 9 kA with an EC-wave power of 100 kW. The optimum beam direction that maximizes the driven current is investigated with the help of ray-tracing code. This direction depends on the magnetic field, efficiency of power absorption, and fraction of the power absorbed by trapped electrons.
- 社団法人 プラズマ・核融合学会の論文
著者
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KUBO Shin
National Insitute for Fusion Science
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SHIMOZUMA Takashi
National Insitute for Fusion Science
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YOSHIMURA Yasuo
National Insitute for Fusion Science
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YAMADA Hiroshi
National Insitute for Fusion Science
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NARIHARA Kazumichi
National Insitute for Fusion Science
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SAKAKIBARA Satoru
National Insitute for Fusion Science
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Mutoh Takashi
National Institute For Fusion Science
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NAGASAKI Kazunobu
Institute of Advanced Energy, Kyoto University
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NISHIURA Masaki
National Institute for Fusion Science
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IGAMI Hiroe
National Institute for Fusion Science
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Tanaka Kenji
National Food Institute
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TAKAHASHI Hiromi
National Institute for Fusion Science, Toki 509-5292 Japan
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MUTOH Takashi
National Institute for Fusion Science, Toki 509-5292, Japan
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MARUSHCHENKO Nikolai
Max-Planck-Institut for Plasmaphysik, EURATOM Association, TI Greifswald, Germany
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TURKIN Yuri
Max-Planck-Institut for Plasmaphysik, EURATOM Association, TI Greifswald, Germany
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SHIMOZUMA Takashi
National Institute for Fusion Science, Toki 509-5292, Japan
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MARUSHCHENKO Nikolai
Max-Planck-Institut für Plasmaphysik (IPP), EURATOM Association, Teilinstitut Greifswald D-17491 Greifswald, Germany
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SAKAKIBARA Satoru
National Institute for Fusion Science, Toki 509-5292, Japan
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NAGASAKI Kazunobu
Institute of Advance Energy, Kyoto University
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TAKAHASHI Hiromi
National Institute for Fusion Science
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