Gyrokinetic simulation of turbulence driven geodesic acoustic modes in edge plasmas of HL-2A tokamak
Gyrokinetic simulation of turbulence driven geodesic acoustic modes in edge plasmas of HL-2A tokamak
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DOI：
10.1063/1.3496981
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发表时间：
2010-11
影响因子：
2.2
通讯作者：
Feng Liu;Zhihong Lin;J. Dong;K. Zhao
中科院分区：
文献类型：
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作者：
Feng Liu;Zhihong Lin;J. Dong;K. Zhao
在HL-2A装置边缘等离子体中观察到高频微湍流与低频测地线声模(GAM)之间的强相关性，这表明GAM可能是通过与湍流的三波耦合产生的，而GAM又被GAM调制。在这项工作中，我们首次使用回转动力环面程序研究了HL-2A装置边缘等离子体中漂移不稳定性的线性和非线性发展，以及GAM(和低频纬向流)的产生及其与湍流的相互作用。模拟结果表明，不稳定的漂移波在HL-2A边缘等离子体中驱动着强烈的湍流。此外，在非线性模拟中还观察到了GAM的产生及其与湍流的相互作用。模拟结果与实验观测结果吻合较好。
Strong correlation between high frequency microturbulence and low frequency geodesic acoustic mode (GAM) has been observed in the edge plasmas of the HL-2A tokamak, suggesting possible GAM generation via three wave coupling with turbulence, which is in turn modulated by the GAM. In this work, we use the gyrokinetic toroidal code to study the linear and nonlinear development of the drift instabilities, as well as the generation of the GAM (and low frequency zonal flows) and its interaction with the turbulence for realistic parameters in the edge plasmas of the HL-2A tokamak for the first time. The simulation results indicate that the unstable drift wave drives strong turbulence in the edge plasma of HL-2A. In addition, the generation of the GAM and its interaction with the turbulence are all observed in the nonlinear simulation. The simulation results are in reasonable agreement with the experimental observations.