Electron collisionless damping of the geodesic acoustic mode in rotating tokamak plasmas

被引：3

作者：

Xie, Baoyi ^{[1
]}

Guo, Wenfeng ^{[2
]}

Gong, Xueyu ^{[1
,3
]}

Yu, Jun ^{[1
]}

Chen, You ^{[1
]}

Cao, Jinjia ^{[3
]}

机构：

[1] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China

[2] Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China

[3] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China

来源：

NUCLEAR FUSION | 2016年 / 56卷 / 12期

基金：

中国国家自然科学基金;

关键词：

geodesic acoustic mode; toroidal rotation; electron dynamics; collisionless damping; TRANSPORT; WAVES; FLOWS;

D O I：

10.1088/0029-5515/56/12/124001

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：

Collisionless damping of the geodesic acoustic mode due to electron dynamics in rotating tokamak plasmas is investigated. A dispersion relation of the geodesic acoustic mode with a non-adiabatic electron response in a rotating tokamak is derived and solved both analytically and numerically. It is found that the collisionless damping of the geodesic acoustic mode, due to electron dynamics, significantly increases with the increasing toroidal rotation, especially in the large safety factor regime. The rotation-induced frequency up-shift of the geodesic acoustic mode increases the resonant velocity, which enables a larger number of electrons to resonate with the geodesic acoustic mode. The significant increase of the number of the resonant electrons significantly enhances the collisionless damping of the geodesic acoustic mode. The result indicates that in rotating tokamak plasmas a more complete picture of the geodesic acoustic mode should include the electron dynamics.

引用

页数：6

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