Fast wave mode-conversion and absorption in tokamak plasma

The ICRF fast wave mode-conversion and correlative damping mechanism in an inhomogeneous hot plasma are investigated for the configuration of tokamak by using the kinetic theory. It is shown that there is the mode-conversion between the fast wave and ion Bernstein wave near the ionion hybrid resonance and the first cyclotron harmonic for a multi-ion plasma. The dispersion relation near the mode-conversion layer significantly depends on k (parallel), species concentration and plasma density. The fast wave energy absorption and its localization can be substantially improved by appropriate choices of these parameters. However no mode-conversion occurs in a one-ion plasma