Nonlinear Dispersion Relation of Geodesic Acoustic Modes

被引：20
|
作者：
Hager, Robert [1 ]
Hallatschek, Klaus [1 ]
机构：
[1] Max Planck Inst Plasma Phys, D-85748 Garching, Germany
来源：
PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 03期
关键词：
Geodesy - Tokamak devices - Plasma turbulence - Dispersions - Quantum theory - Dispersion (waves);
D O I：
10.1103/PhysRevLett.108.035004
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The energy input and frequency shift of geodesic acoustic modes (GAMs) due to turbulence in tokamak edge plasmas are investigated in numerical two-fluid turbulence studies. Surprisingly, the turbulent GAM dispersion relation is qualitatively equivalent to the linear GAM dispersion but can have drastically enhanced group velocities. In up-down asymmetric geometry the energy input due to turbulent transport may favor the excitation of GAMs with one particular sign of the radial phase velocity relative to the magnetic drifts and may lead to pulsed GAM activity.
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页数：5
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