Energetic-ion-driven toroidal alfvén eigenmodes observed in a heliotron/torsatron plasma

M. Takechi, K. Toi, S. Takagi, G. Matsunaga, K. Ohkuni, S. Ohdachi, R. Akiyama, D. S. Darrow, A. Fujisawa, M. Gotoh, H. Idei, H. Iguchi, M. Isobe, T. Kondo, M. Kojima, S. Kubo, S. Lee, T. Minami, S. Morita, K. MatsuokaS. Nishimura, S. Okamura, M. Osakabe, M. Sasao, M. Shimizu, C. Takahashi, K. Tanaka, Y. Yoshimura

研究成果: Contribution to journalArticle査読

35 被引用数 (Scopus)

抄録

Toroidal Alfvén eigenmodes (TAEs) of low toroidal mode number, n=1 and 2, are observed in neutral-beam-heated plasmas in the compact helical system heliotron/torsatron. The observed frequency is proportional to the computed TAE frequency and lies near the lower bound of the innermost TAE gap. The modes are excited only when the beam velocity exceeds about half the central Alfvén velocity and when the net plasma current induced by coinjected neutral beams is in the required range. The modes are localized in the plasma core region, between 0.2 and 0.6 of the plasma minor radius.

本文言語英語
ページ(範囲)312-315
ページ数4
ジャーナルPhysical review letters
83
2
DOI
出版ステータス出版済み - 1 1 1999
外部発表はい

All Science Journal Classification (ASJC) codes

  • 物理学および天文学(全般)

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