Mitigation of NBI-driven Alfvén eigenmodes by electron cyclotron heating in the TJ-II stellarator

K. Nagaoka, T. Ido, E. Ascasíbar, T. Estrada, S. Yamamoto, A. V. Melnikov, A. Cappa, C. Hidalgo, M. A. Pedrosa, B. Ph Van Milligen, I. Pastor, M. Liniers, M. A. Ochando, A. Shimizu, L. G. Eliseev, S. Ohshima, K. Mukai, Y. Takeiri

研究成果: Contribution to journalArticle査読

31 被引用数 (Scopus)

抄録

Alfvén eigenmode (AE) activity driven by NBI-produced fast ions is observed in TJ-II plasmas. A two-step response of the measured AEs to electron cyclotron heating (ECH) power is seen. In a first step, the continuous character of the unstable AEs changes to a chirping character of the marginally unstable AEs when moderate values of ECH power are applied to the NBI-only-heated plasma. In a second step, a significant reduction of the AE amplitude is observed when the ECH power is doubled. This stabilizing effect has been experimentally confirmed both on a shot-by-shot basis and along a single discharge by means of ECH modulation. The observed stabilizing effect is stronger with on-axis ECH than with off-axis ECH power injection.

本文言語英語
論文番号072004
ジャーナルNuclear Fusion
53
7
DOI
出版ステータス出版済み - 7 1 2013
外部発表はい

All Science Journal Classification (ASJC) codes

  • 核物理学および高エネルギー物理学
  • 凝縮系物理学

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