Design of a high power 240 GHz gyromonotron

A second harmonic gyromonotron has been designed to have an output of 4 kilowatts at a frequency of 240 GHz, and to operate with an overall efficiency of 14%. The design method utilized a detailed theory of the gyrotron oscillator and an electron orbit computer code. Particular attention was paid to the problem of mode competition in the oscillator cavity. Although a particular design example is considered, the method is of general interest.