First Demonstration of Rotational Transform Control by Electron Cyclotron Current Drive in Large Helical Device
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概要
- 論文の詳細を見る
An active current drive is a promising technique for improving plasma performances by controlling rotational transform and/or magnetic shear profiles in helical devices. A current drive based on electron cyclotron resonance heating is the most appropriate scheme for this purpose in terms of locality of driven current. Optimum conditions for an efficient electron cyclotron current drive (ECCD) in Large Helical Device (LHD) are being investigated using three-dimensional ray-tracing code, which can simulate propagation and power dissipation of electron cyclotron waves with large parallel refractive index. In the present experiment, inversion of directions of driven plasma current corresponding to injected ECCD modes was demonstrated successfully, and the results could be elucidated by the Fisch-Boozer theory. In addition, clear shifts of rotational transform were observed by motional Stark effect polarimetry. Our findings verified that the ECCD can be used as an effective actuator for controlling the rotational transform and magnetic shear profile in LHD.
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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IDA Katsumi
National Insitute for Fusion Science
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SAKAKIBARA Satoru
National Insitute for Fusion Science
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SEKI Tetsuo
National Insitute for Fusion Science
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TOKUZAWA Tokihiko
National Insitute for Fusion Science
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WATANABE Kiyomasa
National Insitute for Fusion Science
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NOTAKE Takashi
National Institute for Fusion Science
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YOSHINUMA Mikirou
National Institute for Fusion Science
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IGAMI Hiroe
National Institute for Fusion Science
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Inagaki Shigeru
Research Institute For Applied Mechanics Kyushu University
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Tanaka Hitoshi
Graduate School of Energy Science, Kyoto University
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Idei Hiroshi
Research Institute For Applied Mechanics Kyushu University
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YAMAGUCHI Taiki
Fusion Research Development Division, Japan Atomic Energy Agency, Naka 311-0193, Japan
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KOBUCHI Takashi
Faculty of engineering, Tohoku University, Sendai 980-8579, Japan
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NAGASAKI Kazunobu
Graduate school of Energy Science, Kyoto University, Kyoto 606-8501, Japan
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YOSHINUMA Mikirou
National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
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NOTAKE Takashi
National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
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