Effects of fast ions produced by ICRF heating on the pressure in EAST

Ion cyclotron resonance heating (ICRH), which can produce fast ions, is an important auxiliary heating method at EAST. To analyze the effect of ICRH-induced fast ions on the plasma pressure at EAST, simulations are performed using TRANSP and TORIC codes. It is found that the ICRF-induced fast ion pressure cannot be negligible when the ICRF power is sufficiently high. The magnitude of the total ion pressure can be raised up to 60% of the total pressure as the input power rises above 3 MW. The pressure profile is also significantly modified when the resonant layer is changed. It is shown that by changing the wave frequency and antenna position, the total ion pressure profile can be broadened, which might provide an option for profile control at EAST.