A high power gyrotron operating in the TE041mode

A 35-GHz gyrotron operating in the TE
041
mode has been built and tested. Output powers of 320 kW at 40-percent efficiency have been obtained. These test results agree closely with theoretically predicted results. Regions of stable operation in the TE
041
mode were also determined experimentally. These regions could be predicted by a small signal analysis of threshold currents.