Resistive Interchange Modes Destabilized by Helically Trapped Energetic Ions in a Helical Plasma

被引：45
|
作者：
Du, X. D. [1 ]
Toi, K. [2 ]
Osakabe, M. [1 ,2 ]
Ohdachi, S. [1 ,2 ]
Ido, T. [2 ]
Tanaka, K. [2 ]
Yokoyama, M. [1 ,2 ]
Yoshinuma, M. [1 ,2 ]
Ogawa, K. [2 ]
Watanabe, K. Y. [2 ]
Isobe, M. [1 ,2 ]
Nagaoka, K. [1 ,2 ]
Ozaki, T. [2 ]
Sakakibara, S. [1 ,2 ]
Seki, R. [2 ]
Shimizu, A. [2 ]
Suzuki, Y. [1 ,2 ]
Tsuchiya, H. [2 ]
机构：
[1] Grad Univ Adv Study, Dept Fus Sci, Toki, Gifu 5095292, Japan
[2] Natl Inst Nat Sci, Natl Inst Fus Sci, Toki, Gifu 5095292, Japan
来源：
PHYSICAL REVIEW LETTERS | 2015年 / 114卷 / 15期
基金：
日本学术振兴会;
关键词：
Frequency chirping - Interchange mode - Neutral beam injection - Peripheral regions - Radial electric field - Resonant interaction - Toroidal mode numbers - Toroidal plasmas;
D O I：
10.1103/PhysRevLett.114.155003
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A new bursting m = 1/n = 1 instability (m; n: poloidal and toroidal mode numbers) with rapid frequency chirping down has been observed for the first time in a helical plasma with intense perpendicular neutral beam injection. This is destabilized in the plasma peripheral region by resonant interaction between helically trapped energetic ions and the resistive interchange mode. A large radial electric field is induced near the edge due to enhanced radial transport of the trapped energetic ions by the mode, and leads to clear change in toroidal plasma flow, suppression of microturbulence, and triggering an improvement of bulk plasma confinement.
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页数：5
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