Development of 1 MW output power level gyrotron for ITER

The report presents the results of calculation, design and experimental stu dy of the 170 GHz/1 MW and other ITER related gyrotrons in Russia. The main problems of powerful gyrotrons at present are discussed. The dependence of gyrotron parameters on the beam current, accelerating voltage and magnetic field is analysed. ITER - related 110 GHz and 140 GHz gyrotrons are also i nvestigated including a single-stage depressed collector version (CPD). The possibility to make high - efficient 170 GHz/1 MW gyrotron for the ITER is proved by calculations and experiments.