Progress in the development of 117.5 GHz and 170 GHz gyrotrons

Two megawatt-class gyrotrons at frequencies of 117.5 GHz and 170 GHz have recently been fabricated and tested at CPI. The 117.5 GHz gyrotron was designed to produce up to 1.8 MW, for 10-second pulses. The 170 GHz gyrotron is specified as a 500 kW CW system, but has been designed with the goal of generating up to 1 MW CW. Thus far both gyrotrons have achieved the peak power goals in initial testing. Further work is aimed at extending operation to the required pulse length.