Collisionless Damping of Geodesic Acoustic Mode in a Multi-Ion Plasma with Superthermal Ions

被引：4
|
作者：
Ni, G. S. [1 ]
Liu, Y. [2 ]
Liu, S. Q. [1 ]
机构：
[1] Nanchang Univ, Dept Phys, Nanchang 330047, Peoples R China
[2] Nantong Univ, Sch Sci, Nantong 226019, Peoples R China
来源：
CONTRIBUTIONS TO PLASMA PHYSICS | 2015年 / 55卷 / 08期
基金：
中国国家自然科学基金;
关键词：
Collisionless damping; geodesic acoustic mode; nonextensive distribution; ZONAL FLOWS; WAVES; RELAXATION; DYNAMICS; POWER;
D O I：
10.1002/ctpp.201500036
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
The dispersion relation of geodesic acoustic mode is investigated in a multi-ion toroidal plasma on the basis of linear gyrokinetic equations where ions are assumed to take a nonextensive distribution. It is found that the frequency of GAM becomes larger with the decrease of q. Consequently, GAM will damp more rapidly. The effective charge corresponding to the maximum damping rate is found to move towards unity as q decreases. As indicates that in a plasma with superthermal bulk ions, the influence of the impurity ion on the damping rate is weakened. (C) 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
引用
收藏
页码：578 / 585
页数：8
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