Energetic-Particle-Induced Geodesic Acoustic Mode
Energetic-Particle-Induced Geodesic Acoustic Mode
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DOI：
10.1103/physrevlett.101.185002
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发表时间：
2008-10-31
影响因子：
8.6
通讯作者：
Fu, G. Y.
中科院分区：
文献类型：
--
作者：
Fu, G. Y.
提出了一种新的高能粒子诱导测地线声模式（EGAM）。模态频率和模态结构由高能粒子动力学效应非摄动决定。特别是EGAM频率被发现大大低于标准GAM频率。径向模宽度由高能粒子漂移轨道宽度决定，在高能粒子压力大、安全系数大的情况下，径向模宽度可以相当大。这些结果与最近对DIII-D中光束驱动n=0模式的实验观察一致。
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.