文献类型：期刊文献

英文题名：Nonlinear excitation of geodesic acoustic mode by drift waves in anisotropic tokamak plasmas with toroidal rotation

作者：Huang, Handi[1];Ren, Haijun[1,2];Ming, Zhengyang[1];Zhang, Debing[3]

机构：[1]Univ Sci & Technol China, Sch Phys Sci, Hefei 230026, Anhui, Peoples R China;[2]Univ Sci & Technol China, CAS Key Lab Geospace Environm, Hefei 230026, Anhui, Peoples R China;[3]East China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China

年份：2022

卷号：29

期号：3

外文期刊名：PHYSICS OF PLASMAS

收录：;EI(收录号：20221111778110);WOS:【SCI-EXPANDED(收录号:WOS:000764431200004)】；

基金：ACKNOWLEDGMENTS This work was supported by the National Natural Science Foundation of China under Grant Nos. 12175228 and 12005063.

语种：英文

外文关键词：Magnetoplasma - Plasma theory - Geodesy - Magnetohydrodynamics - Plasma confinement - Plasma waves - Nonlinear equations - Tokamak devices

摘要：Nonlinear excitation of geodesic acoustic mode (GAM) by ions drift waves is investigated in anisotropic toroidally rotating tokamak plasmas by using an ideal magnetohydrodynamic model and standard double adiabatic equations. It is found that the radial wave number k(x) of the effectively excited GAM and the GAM frequency increase with the ratio of the perpendicular pressure to the parallel pressure chi as well as the toroidal rotation Mach number. The equilibrium anisotropy and the ratio of the radial scale length of the equilibrium density to the tokamak major radius are shown to play a significant role in the growth rate and frequency shift of GAM. The growth rate increases with the normalized GAM frequency first and then decreases to zero as the GAM frequency increases. When the GAM frequency increases again, the growth rate continues to increase but with a relatively smaller magnitude.