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A gyrokinetic simulation of the influence of electron cyclotron current driveand ion kinetic effect on the m/n=2/1 tearing mode (TM) instabilities ispresented in HL-2A and DIII-D tokamak configurations. The TM evolution iscalculated with a finite mass electron model and the rf current source isobtained by ray-tracing and the Fokker-Planck method. The TMs are found to beperfectly stabilized by a continuous 1MW 68GHz X2-mode in HL-2A tokamak, whileinstabilities in the DIII-D discharge (with lower value of CR=I_{rf}/I_{0},where Irf is the wave driven current and I0 is the equilibrium plasma current)are only partially stabilized with the 1MW 110GHz X2-mode due to inadequatepower input. The result also indicates that a helicon current drive is moreefficient than a continuous ECCD. Analysis of the GTC simulation reveals, bothin HL-2A and DIII-D, that the presence of ions can reduce the island width aswell as the growth rate. Furthermore, the kinetic effect of thermal ions on TMis found to be more pronounced with higher ion temperature.

Gyrokinetic simulations of the influence of electron cyclotron current drive on tearing mode instabilities in tokamaks