Studies of a TE/sub 04/ mode, wideband, triplet gyrotron amplifier with harmonic multiplication

Summary form only given, as follows. A new triplet gyrotron amplifier, which we call Gyrotriotron, has recently been developed. The device utilizes a 1-2-2 harmonic-multiplying scheme and operates with a short Ku-band gyro-TWT as input stage, a longer Ka-band gyro-TWT as output stage and a multiunit stagger-tuned cluster-cavity as intermediate stage. Electronic coupling of adjacent stages is realized through beam ballistic bunching in the radiation-free drift spaces between the stages. A mode converter/filter type of interaction circuit is employed for each stage to minimize spurious mode competitions. Theoretical studies show that in addition to the features of lower magnetic field requirement and lower input frequency, high gain, high efficiency and wide bandwidth are expected for this three stage harmonic multiplying gyro-amplifier. A proof-of-principle Gyrotriotron tube with TE/sub 04/ mode output was designed, fabricated and tested. This presentation provides the device development and an overview of some gyrotriotron-related special techniques that are detailed in the other two poster papers.