Abstract
The operation of a gyrotron based upon a quasi-optical cavity is reported. The cavity mirrors were separated by 81 cm, allowing the use of mirrors large enough in diameter to be in principle compatible with CW operation. The pulse length in this experiment was 12 microseconds. The gyrotron operated between 113 GHz and 122 GHz, with a maximum output power of 50 kW. The highest efficiency observed was 7·3%. The observed powers and efficiencies were lower than originally anticipated, but when cavity losses and the actual performance of the electron gun was included, agreed well with theoretical predictions based on multimode simulations. The output spectra were measured, and were in good qualitative agreement with theory
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