Propagation and power deposition of electron cyclotron waves in non-circular tokamak plasmas

With solving the plasma equilibrium equation, ray equations and quasi-linear Fokker-Planck equation, the ray trajectories and power deposition of EC wave were numerically simulated in non-circular HL-2A Tokamak plasmas. The results show that when EC waves are launched from the top, the rays propagate towards the low-field side in non-circular plasma compared with the circular one, and the same effect occurs with increasing the central density of electrons, and the power deposition decreases accordingly. When the EC waves of ordinary mode are launched from the mid-plane and low-field-side, ray trajectories are more bent as the parallel refractive index increases and even recurve to the low-field side when the parallel refractive index reaches a critical value. The power deposition decreases with increasing poloidal injection angle and reaches the maximum value when the toroidal injection angle is about 10 degree. (authors)