  We have developed a hybrid code GMEC: Gyro-kinetic Magnetohydrodynamics (MHD)
Energetic-particle Code that can numerically simulate energetic particle-driven
Alfv\'en eigenmodes and energetic particle transport in tokamak plasmas. In
order to resolve the Alfv\'en eigenmodes with high toroidal numbers
effectively, the field-aligned coordinates and meshes are adopted. The extended
MHD equations are solved with five-points finite difference method and fourth
order Runge-Kutta method. The gyrokinetic equations are solved by
particle-in-cell (PIC) method for the perturbed energetic particle pressures
that are coupled into the MHD equations. Up to now, a simplified version of the
hybrid code has been completed with several successful verifications including
linear simulations of toroidal Alfv\'en eigenmodes and reversed shear Alfv\'en
eigenmodes.
