Nonlinear Frequency Oscillation of Alfven Eigenmodes in Fusion Plasmas

被引：74
|
作者：
Zhang, H. S. [1 ,2 ]
Lin, Z. [1 ]
Holod, I. [1 ]
机构：
[1] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA
[2] Peking Univ, Fus Simulat Ctr, Beijing 100871, Peoples R China
来源：
PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 02期
基金：
美国国家科学基金会;
关键词：
TRANSPORT; MODES;
D O I：
10.1103/PhysRevLett.109.025001
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A nonlinear oscillation of frequency and amplitude is found by massively parallel gyrokinetic simulations of Alfven eigenmodes excited by energetic particles in toroidal plasmas. The fast and repetitive frequency chirping is induced by the evolution of coherent structures in the phase space. The dynamics of the coherent structures is controlled by the competition between the phase-space island formation due to the nonlinear particle trapping and the island destruction due to the free streaming. The chirping dynamics provides a conceptual framework for understanding nonlinear wave-particle interactions underlying the transport process in collisionless plasmas.
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页数：5
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