Properties of energetic-particle continuum modes destabilized by energetic ions with beam-like velocity distributions
Properties of energetic-particle continuum modes destabilized by energetic ions with beam-like velocity distributions
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DOI：
10.1063/1.2234296
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发表时间：
2006-08
影响因子：
2.2
通讯作者：
Y. Todo
中科院分区：
文献类型：
--
作者：
Y. Todo
Properties of energetic-particle continuum modes (EPMs) destabilized by energetic ions in tokamak plasmas were investigated using a hybrid simulation code for magnetohydrodynamics and energetic particles. The energetic ions are assumed to have beam-like velocity distributions for the purpose of clarifying the dependence on energetic ion velocity. It was found that for beam velocities lower than the Alfven velocity, the unstable modes are EPMs while the toroidal Alfven eigenmodes are unstable for the beam velocities well above the Alfven velocity. The EPMs destabilized by the copassing energetic ions and those destabilized by the counterpassing energetic ions differ in primary poloidal harmonics and spatial locations. The frequencies of the EPMs are located close to the shear Alfven continuous spectrum when they are compared at the spatial peak locations of the primary poloidal harmonic or compared at the spatial tails if the primary poloidal harmonic is m=1. The frequencies of the EPMs were carefully comp...
