This paper reports for the first time an experimental study on the power deposition profile of the ion cyclotron range frequencies (ICRF) power depositing on electrons in HT-7. The fast Fourier transform (FFT) analysis and the break in slope (BIS) method are utilized to obtain the information of the power deposition. The results indicate that the electrons were heated directly, and the electrons absorbed around 20% of the input power of the discharge of interest.
The full wave TORIC code and the Kinetic Fokker-Planck SSFPQL code are com- bined to perform self-consistent simulations of the ICRF heating in the EAST 2D magnetic config- uration. The combined package is applied to the ICRF hydrogen minority heating in a deuterium plasma with the hydrogen concentration up to 10%. The fast wave propagation and absorption properties, power partitions among the plasma species and the RF driven energetic tails have been analyzed. Meanwhile, in order to optimize the ICRF heating, changing the resonance locations has also been considered in EAST plasmas.
Radio frequency (RF) plasma heating in ion cyclotron range of frequencies (ICRF) was successfully performed on the Experimental Advanced Superconducting Tokamak (EAST). This is mainly because lithium wall conditioning was routinely used to reduce both impurity and hydrogen (H) recycling and to improve the ICRF power absorption. Mainly ICRF heating of the H minority regime at 27 MHz has been applied in deuterium plasmas. The ion cyclotron resonance heating (ICRH) is found to depend strongly on plasma preheating. The ICRH efficiency can be much improved in conjunction with the lower hybrid wave (LHW). Effective ion and electron heating was observed with the H minority heating mode. The increase of the stored energy reached 30 kJ in L-mode plasma by using the ICRF power of 1.0 MW alone when the H cyclotron resonance layer was at plasma center.