Finite-orbit-width effects on the geodesic acoustic mode in the toroidally rotating tokamak plasma

摘要

The Landau damping of geodesic acoustic mode in a toroidal rotating tokamak plasma is analytically investigated by taking into account the finite-orbit-width resonance effect to the 3rd order. The analytical result is shown to agree well with the numerical solution. The dependence of the damping rate on the toroidal Mach number M relies on k_rρ_i. For sufficiently small k_rρ_i, the damping rate monotonically decreases with M. For relatively large k_rρ_i, the damping rate increases with M until approaching the maximum and then decreases with M.