An investigation is made of the effect of tuning ICRF heating to neutral-beam-injected ions in a two-component plasma. The corresponding RF-induced velocity diffusion is found to cause a significant enhancement of the high-energy tail of the beam ions. This is also shown to give rise to a subsequent increase in the fusion power multiplication factor, indicating an efficient use of the available heating power.
The effect of particle trapping on the velocity space diffusion caused by ion-cyclotron resonance heating is considered. A bounce-averaged Fokker–Planck equation is derived, which determines the distribution function of the heated ions. Trapped particle effects lead to significant changes in the rf-driven diffusion operator as compared to previously used models.
An investigation is made of the effect of selective ICRF heating of neutral-beam-injected ions. The minority heating scheme as well as the second harmonic heating scheme are considered. Significant ion tail enhancement and subsequent increase in the fusion power multiplication are found. The cut-off in the RF-induced velocity space diffusion at small wavelengths is also investigated.
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