Fast excitation of geodesic acoustic mode by energetic particle beams

被引：12
|
作者：
Cao, Jintao [1 ]
Qiu, Zhiyong [2 ]
Zonca, Fulvio [2 ,3 ]
机构：
[1] Chinese Acad Sci, Inst Phys, POB 603, Beijing 100080, Peoples R China
[2] Zhejiang Univ, Inst Fus Theory & Simulat, Hangzhou 310003, Zhejiang, Peoples R China
[3] ENEA CR Frascati, I-00044 Frascati, Italy
来源：
PHYSICS OF PLASMAS | 2015年 / 22卷 / 12期
基金：
美国国家科学基金会;
关键词：
WAVES;
D O I：
10.1063/1.4938277
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：
A new mechanism for geodesic acoustic mode (GAM) excitation by a not fully slowed down energetic particle (EP) beam is analyzed to explain experimental observations in Large Helical Device. It is shown that the positive velocity space gradient near the lower-energy end of the EP distribution function can strongly drive the GAM unstable. The new features of this EP-induced GAM (EGAM) are: (1) no instability threshold in the pitch angle; (2) the EGAM frequency can be higher than the local GAM frequency; and (3) the instability growth rate is much larger than that driven by a fully slowed down EP beam. (c) 2015 AIP Publishing LLC.
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页数：4
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