Electromagnetic effects of kinetic geodesic acoustic mode in tokamak plasmas

被引：25

作者：

Wang, Lingfeng ^{[1
]}

Dong, J. Q. ^{[1
,2
]}

Shen, Y. ^{[1
]}

He, H. D. ^{[1
]}

机构：

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

[2] Zhejiang Univ, Inst Fus Theory & Simulat, Hangzhou 310027, Peoples R China

来源：

PHYSICS OF PLASMAS | 2011年 / 18卷 / 05期

关键词：

ZONAL FLOWS;

D O I：

10.1063/1.3590892

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：

Electromagnetic effects of the kinetic geodesic acoustic modes (KGAMs) are numerically studied in low beta(= plasma pressure/magnetic pressure) tokamak plasmas. The parallel component of the perturbed vector potential is considered along with the electrostatic potential perturbation. The finite Larmor radius and finite orbit width of the ions as well as electron parallel dynamics are all taken into account. Systematic harmonic and ordering analysis is performed for collisionless damping of the KGAMs, assuming beta similar to (kappa rho(i))(2), where kappa and rho(i)are the radial component of the KGAM wave vector and the Larmor radius of the ions, respectively. It is found that the electron parallel dynamics enhances the damping of the electrostatic KGAM modes when the safety factor is high. In addition, the electromagnetic (finite beta effect is revealed to enhance and weaken the damping of the modes in plasmas of low and high safety factor similar to 2.0 and 5.5, respectively. The harmonic features of the KGAMs are discussed as well. (C) 2011 American Institute of Physics. [doi:10.1063/1.3590892]

引用

页数：10

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