The 60 GHz gyrotron development program

The development of a microwave oscillator capable of producing 200 kW of CW power at 60 GHz was studied. Tests on two experimental tubes, X-3R and X-4, were completed during the quarter. X-3R, which included design modifications to the beam tunnel and cavity coupling, produced 200 kW of peak RF output power at 100 ms pulse duration. The tube proved to be easier to operate than previous experimental tubes because of the modifications. The X-4, which used an older RF circuit design, but in a CW configuration, produced 71.5 kW CW.