## Gyrokinetic-magnetohydrodynamic hybrid simulation of the transition from toroidal Alfv{acute e}n eigenmodes to kinetic ballooning modes in tokamaks

A gyrokinetic-magnetohydrodynamic (MHD) hybrid simulation code has been developed in order to study high-{ital n} (where {ital n} is the toroidal mode number) MHD instabilities driven by energetic particles in finite-{beta} tokamaks. Here {beta} is the ratio between plasma and magnetic pressures. Specifically, it is observed that as the core plasma {beta} value increases, there is a corresponding transition from the toroidal Alfv{acute e}n eigenmode (TAE) to the kinetic ballooning mode (KBM). The energetic particle mode (EPM) branches of both the toroidal Alfv{acute e}n mode (TAM) and KBM are shown to be important in this transition. KBM are preferentially excitedmore »