Theory of step-tunable gyrotrons operating at two cyclotron harmonics

The scaling of operating parameters and the tendencies in the efficiency of the step-tunable gyrotron operating in a set of modes in a cavity of a giv en length are considered. Results of calculations are reported for design o f a similar to 1-kW, step-tunable gyrotron oscillator operating from 150 to 600 GHz in steps of about 15 GHz, Detailed results are presented for the e fficiency, power losses in the cavity, and the starting conditions. Designs of the electron gun electrodes and of an output mode transducer are also p resented. Full modulation of the radiation via the modulating anode of a ma gnetron injection gun is considered. The gyrotron would be of use for plasm a diagnostics and spectroscopy, including electron paramagnetic resonance s pectroscopy (EPR).