Design considerations for a 1 MW CW gyrotron with an internal converter

摘要

Varian is carrying out the development of high-power, CW gyrotrons at frequencies ranging from 100--140 GHz. Recent experiments, carried out at a frequency of 110 GHz, resulted in the generation of output powers of 500 kW for 2.5-second pulses and 1 MW for 1 ms pulse durations. The output mode of this tube was a whispering-gallery mode, based on the TE(sub 22,2) mode employed in the interaction cavity. Current design activity is aimed at producing a 1 MW CW gryotron at the same frequency, but with a guassian output mode structure. This type of output mode is desirable for low-loss transmission in a corrugated waveguide or mirror transmission line. In addition to the change in output coupling, the cavity mode will be changed to the TE(sub 22,6) mode. The higher order cavity mode is consistent with higher power or higher frequency requirements that will be addressed in subsequent development activities.