TIME-DEPENDENT EFFECTS OF FUSION REACTIVITY ENHANCEMENT DUE TO MINORITY HEATING IN D-HE-3 TOKAMAK PLASMAS

In D-T and D-He-3 plasmas, ICRF heating at the second harmonic of deut erium results in a modification to the distribution function of the he ated ions. This paper describes the results of such effects on the dyn amic behaviour of plasmas. Using a O-D plasma transport model, the eff ect of ICRF heating on an operating point is analysed for ITER and for a D-He-3 tokamak. To describe the dynamic behaviour, a model for the characteristic time of tail relaxation, tau(xi), is developed and a fe edback model based on auxiliary power is presented. The stabilization of temperature perturbations in a D-He-3 plasma is simulated for vario us values of tau(xi).