Energetic-Particle-Induced Geodesic Acoustic Mode

被引：176

作者：

Fu, G. Y. ^{[1
]}

机构：

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

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.101.185002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A new energetic particle-induced geodesic acoustic mode (EGAM) is shown to exist. The mode frequency and mode structure are determined nonperturbatively by energetic particle kinetic effects. In particular the EGAM frequency is found to be substantially lower than the standard GAM frequency. The radial mode width is determined by the energetic particle drift orbit width and can be fairly large for high energetic particle pressure and large safety factor. These results are consistent with the recent experimental observation of the beam-driven n=0 mode in DIII-D.

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页数：4

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