Theory and observations of high frequency Alfven eigenmodes in low aspect ratio plasmas

被引：65

作者：

Gorelenkov, NN ^{[1
]}

Fredrickson, E ^{[1
]}

Belova, E ^{[1
]}

Cheng, CZ ^{[1
]}

Gates, D ^{[1
]}

Kaye, S ^{[1
]}

White, R ^{[1
]}

机构：

[1] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA

来源：

NUCLEAR FUSION | 2003年 / 43卷 / 04期

关键词：

D O I：

10.1088/0029-5515/43/4/302

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：

New observations of sub-cyclotron frequency instability in low aspect ratio plasmas in national spherical torus experiments are reported. The frequencies of observed instabilities correlate with the characteristic Alfven velocity of the plasma. A theory of localized compressional Alfven eigenmodes (CAE) and global shear Alfven eigenmodes (GAE) in low aspect ratio plasmas is presented to explain the observed high frequency instabilities. CAEs/GAEs are driven by the velocity space gradient of energetic super-Alfvenic beam ions via Doppler shifted cyclotron resonances. One of the main damping mechanisms of GAEs, the continuum damping, is treated perturbatively within the framework of ideal MHD. Properties of these cyclotron instability ions are presented.

引用

页码：228 / 233

页数：6

共 16 条

[1] EXCITATION OF GLOBAL EIGENMODES OF THE ALFVEN-WAVE IN TOKAMAKS [J].