60 GHz gyrotron development program. Quarterly report No. 15, January-March 1983

The objective of this program is to develop a microwave oscillator capable of producing 200 kW of CW power at 60 GHz. Additional calculations for stepped cavity designs are reported. The work on collector fatigue improvement has continued. Window work has stressed the implementation of an FC-75 chilling system and the thermal imaging system for viewing the window temperature. Extensive measurements were made on the output window of the 56 GHz CW gyrotron using three systems. Further investigations of three water load approaches are described.