DESIGN AND TESTS OF A GYROTRON WITH A RADIALLY-EXTRACTED ELECTRON-BEAM

A high-power gyrotron, employing an output coupling concept where the spent electron beam was extracted radially though a slot in the output waveguide, has been designed and tested, The separation of the collec tion area for the electron beam from the outgoing microwave power is r equired to achieve MW-level average power in gyrotrons. The tube emplo yed a TE(22),(2),(1)-mode interaction cavity that was designed for ope ration at a frequency of 110 GHz, Tests on the tube resulted in an out put power level of 470 kW for pulse durations of 2.5 seconds in the de sired TE(22),(2) mode at 110 GHz, Output power levels of 1 MW mere ach ieved under short-pulse (1 ms) operation.