Abstract
Basing on experimental advanced superconducting Tokamak (EAST), we have researched relation between bootstrap current and α -induced toroidal Alfven eigenmode ( α TAE, α is a measure of plasma pressure gradient), which is investigated, in this paper, for the EAST tokamak operation condition with the bootstrap current. Our results show that the α TAE may exist in a relatively broad region of minor radius, where a large bootstrap current density is observed. In the presence of energetic particles, produced by the NBI experiments, our MHD-gyrokinetic hybrid simulations demonstrate that this quasi-marginally stable α TAE (within MHD description) can be readily destabilized by the kinetic compression upon the wave-particle resonances.
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