Energetic particle driven geodesic acoustic mode in a toroidally rotating tokamak plasma

被引:9
|
作者
Ren, Haijun [1 ,2 ]
机构
[1] Univ Sci & Technol China, CAS Key Lab Geospace Environm, Hefei 230026, Peoples R China
[2] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Peoples R China
基金
中国国家自然科学基金;
关键词
geodesic acoustic mode; energetic particles; toroidal rotation; tokamak; ZONAL FLOWS; EXCITATION; EQUATIONS; DYNAMICS;
D O I
10.1088/0029-5515/57/1/016023
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
Energetic particle (EP) driven geodesic acoustic modes (EGAMs) in toroidally rotating tokamak plasmas are analytically investigated using the hybrid kinetic-fluid model and gyrokinetic equations. By ignoring high-order terms and ion Landau damping, the kinetic dispersion relation is reduced to the hybrid one in the large safety factor limit. There is one high-frequency branch with a frequency larger than omega(t0), the transit frequency of EPs with initial energy, which is always stable. Two low-frequency solutions with a frequency smaller than omega(t0) are complex conjugates in the hybrid limit. In the presence of ion Landau damping, the growth rate of the unstable branch is decreased and the damping rate of the damped branch is increased. The toroidal Mach number is shown to increase Omega(r), the normalized real frequency of both branches. Although not affecting the instability critical condition, the Mach number decreases the growth rate when Omega(r) is larger than a critical value Omega(cri)(r) and enlarges the growth rate when Omega(r)< Omega(cri)(r). The ion Landau damping effect is negligible for large M. But the discrepancy between the kinetic dispersion relation and the hybrid one becomes ignorable only for q greater than or similar to 7.
引用
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页数:9
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