Numerical Investigation of Finite k Effect on Damping Rate of Geodesic Acoustic Mode in Collisionless Plasmas
GUO Wen-Feng1,3, WANG Shao-Jie2,3, LI Jian-Gang1
1Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 2300312Department of Modern Physics, University of Science and Technology of China, Hefei 2300263Center for Magnetic Fusion Theory, Chinese Academy of Sciences, Hefei 230031
Numerical Investigation of Finite k Effect on Damping Rate of Geodesic Acoustic Mode in Collisionless Plasmas
GUO Wen-Feng1,3, WANG Shao-Jie2,3, LI Jian-Gang1
1Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 2300312Department of Modern Physics, University of Science and Technology of China, Hefei 2300263Center for Magnetic Fusion Theory, Chinese Academy of Sciences, Hefei 230031
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 k\ρi. However, for the short-wavelength case (k\ρi =0.2), the analytical methods are only good enough around q=4 because of the slow convergence of Bessel function with the large variable.
Abstract：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 k\ρi. However, for the short-wavelength case (k\ρi =0.2), the analytical methods are only good enough around q=4 because of the slow convergence of Bessel function with the large variable.
GUO Wen-Feng;WANG Shao-Jie;LI Jian-Gang. Numerical Investigation of Finite k Effect on Damping Rate of Geodesic Acoustic Mode in Collisionless Plasmas[J]. 中国物理快报, 2009, 26(4): 45202-045202.
GUO Wen-Feng, WANG Shao-Jie, LI Jian-Gang. Numerical Investigation of Finite k Effect on Damping Rate of Geodesic Acoustic Mode in Collisionless Plasmas. Chin. Phys. Lett., 2009, 26(4): 45202-045202.
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