Eigenmode analysis of geodesic acoustic modes

被引：103

作者：

Gao, Zhe ^{[1
,2
]}

Itoh, K. ^{[2
]}

Sanuki, H. ^{[2
]}

Dong, J. Q. ^{[3
]}

机构：

[1] Tsinghua Univ, Dept Engn Phys, Beijing 100084, Peoples R China

[2] Natl Inst Nat Sci, Natl Inst Fus Sci, Toki, Gifu 5095292, Japan

[3] SW Inst Phys, Chengdu 610041, Peoples R China

来源：

PHYSICS OF PLASMAS | 2008年 / 15卷 / 07期

基金：

中国国家自然科学基金; 日本学术振兴会;

关键词：

D O I：

10.1063/1.2956993

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：

Geodesic acoustic modes (GAMs) are studied as plasma eigenmodes when an electrostatic potential nearly constant around a magnetic surface is applied to collisionless toroidal plasmas. Besides the standard GAM, a branch of low frequency mode and an infinite series of ion sound wavelike modes are identified. Eigenfrequencies of these modes are obtained analytically and numerically from a linear gyrokinetic model. The finite gyroradius effect is found to enhance the collisionless damping of the standard GAM, while this enhancement is not monotonic as the safety factor varies. Moreover, additional damping due to higher-harmonic resonances becomes important when the safety factor increases. The mode structure of the GAM is also discussed. (c) 2008 American Institute of Physics.

引用

页数：9

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