Numerical Investigation of Finite k Effect on Damping Rate of Geodesic Acoustic Mode in Collisionless Plasmas  

作　　者：郭文峰 王少杰 李建刚 

机构地区：[1]Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031 [2]Department of Modern Physics, University of Science and Technology of China, Hefei 230026 [3]Center for Magnetic Fusion Theory, Chinese Academy of Sciences, Hefei 230031

出　　处：《Chinese Physics Letters》2009年第4期147-149,共3页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No 10425526.

摘　　要：Numerical method is applied to the investigation of the GAM damping rate with the finite k effects included. It is found that generally the damping rate given by the analytical method is smaller than that given by the numerical method, and the analytical damping rate has good approximation in the high q region （q 〉 4）. The difference between the analytical and numerical damping rates increases with the increasing kpi. However, for the short-wavelength case （kpi = 0.2）, the analytical methods are only good enough around q = 4 because of the slow convergence of Bessel function with the large variable.Numerical method is applied to the investigation of the GAM damping rate with the finite k effects included. It is found that generally the damping rate given by the analytical method is smaller than that given by the numerical method, and the analytical damping rate has good approximation in the high q region （q 〉 4）. The difference between the analytical and numerical damping rates increases with the increasing kpi. However, for the short-wavelength case （kpi = 0.2）, the analytical methods are only good enough around q = 4 because of the slow convergence of Bessel function with the large variable.

分 类 号：O174.61[理学—数学] P435[理学—基础数学]