Dependence of EC-Driven Current on the EC-Wave Beam Direction in LHD

• YOSHIMURA Yasuo

  National Institute for Fusion Science, Toki 509-5292, Japan

• KUBO Shin

  National Institute for Fusion Science, Toki 509-5292, Japan

• SHIMOZUMA Takashi

  National Institute for Fusion Science, Toki 509-5292, Japan

• IGAMI Hiroe

  National Institute for Fusion Science, Toki 509-5292, Japan

• TAKAHASHI Hiromi

  National Institute for Fusion Science, Toki 509-5292, Japan

• NISHIURA Masaki

  National Institute for Fusion Science, Toki 509-5292, Japan

• SAKAKIBARA Satoru

  National Institute for Fusion Science, Toki 509-5292, Japan

• TANAKA Kenji

  National Institute for Fusion Science, Toki 509-5292, Japan

• NARIHARA Kazumichi

  National Institute for Fusion Science, Toki 509-5292, Japan

• MUTOH Takashi

  National Institute for Fusion Science, Toki 509-5292, Japan

• YAMADA Hiroshi

  National Institute for Fusion Science, Toki 509-5292, Japan

• NAGASAKI Kazunobu

  Institute of Advanced Energy, Kyoto University, Uji 611-0011, Japan

• MARUSHCHENKO Nikolai B.

  Max-Planck-Institut for Plasmaphysik, EURATOM Association, TI Greifswald, Germany

• TURKIN Yuri

  Max-Planck-Institut for Plasmaphysik, EURATOM Association, TI Greifswald, Germany

抄録

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.

収録刊行物

• Plasma and Fusion Research

  Plasma and Fusion Research 6 2402073-2402073, 2011

  一般社団法人 プラズマ・核融合学会

キーワード

• ECCD
• electron cyclotron current drive
• plasma current
• LHD
• TRAVIS

詳細情報

• CRID: 1390001205253345280
• NII論文ID: 130002059535
• DOI: 10.1585/pfr.6.2402073
• ISSN: 18806821
• HANDLE: 10655/6434
• Web Site: https://nifs-repository.repo.nii.ac.jp/records/181
• Web Site: http://www.jstage.jst.go.jp/article/pfr/6/0/6_0_2402073/_pdf
• 本文言語コード: en
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