Development in Russia of high power gyrotrons for plasma fusion installations

Electron cyclotron systems of fusion installations are based on powerful millimeter wave sources - gyrotrons, which are capable to produce now microwave power up to 1 MW in very long (hundreds seconds) pulses. The paper presents the latest achievements in development at IAP/GYCOM of MW power level gyrotrons for fusion installations (compare to [G.G. Denisov et al., 2007]). Main development efforts were spent for development 170GHz/lMW/50%/CW gyrotron for ITER and multi-frequency gyrotrons.