FEEDBACK SUPPRESSION OF THE RADIATIVE CONDENSATION INSTABILITY

A new scheme of feedback suppression of the radiative condensation ins tability in the tokamak edge plasma is presented. The physics basis of this scheme is the modulation of the parallel electron thermal flux a t the instability frequency via a feedback circuit. The latter consist s of a temperature sensor, amplifiers, phase shifters, and a suitable form of insulated segmented poloidal limiter sections used as suppress ors. The necessary feedback power is the order of a kilowatt for small tokamaks and a few megawatts for large reactor-type machines.