TE/sub 0n/ mode clustered-cavities and extended interaction cavities for wideband gyro-amplifiers

Summary form only given, as follows. Two newly proposed gyro-device interaction cavities, the TE/sub 0n/ mode clustered-cavity and the extended interaction cavity, have been both theoretically and experimentally studied to demonstrate their performance capability in broadening the bandwidth of high power gyrotron amplifiers. The results of the HFSS code simulation and cold test experiment show that a joint application of these two kinds of cavities to gyroklystron, phigtron and the newly suggested gyrotriotron interaction circuits, could broaden the operating bandwidth up to 3/spl sim/5% at megawatt power level and millimeter wave frequencies. The simulation and experiments also demonstrate these cavities have superior TE/sub 0n/ (n=3-5) mode selectivity, which is of vital importance in high power gyro-amplifiers to resolve the mode competition problems. The related technology of constructing the cavities is also presented.