2015/03/04 by Haijun Ren, Ren, Haijun
Physics and Astronomy · #Ionosphere and magnetosphere dynamics #Laser-Plasma Interactions and Diagnostics #Magnetic confinement fusion research #physics.plasm-ph
paper · pdf · doi:10.48550/arxiv.1503.01315
arXiv admin note: text overlap with arXiv:1501.01750
arxiv created 2015/03/04 · arxiv updated 2015/03/05
Effects of anisotropy on the geodesic acoustic mode (GAM) is analyzed by using gyro-kinetic equations applicable to low-frequency microinstabilities in a toroidally rotating tokamak plasma. Dispersion relation in the presence of arbitrary Mach number M, anisotropy strength σ, and the temperature ration τ is analytically derived. It is shown that when σ is less than 3 + 2 τ, the increased electron temperature with fixed ion parallel temperature increases the normalized GAM frequency. When σ is larger than 3 + 2 τ, the increasing of electron temperature decreases the GAM frequency. The anisotropy σ always tends to enlarge the GAM frequency. The Landau damping rate is dramatically decreased by the increasing τ or σ.