Study on the interaction between electron beam and waves in gyro klystron amplifiers

The theoretical analysis about electron beam and waves interaction is presented. Based on the analysis and calculations of RF system and magnetron injection gun, a four-cavity gyro klystron amplifier is designed and optimized. 230 kW peak output power, 45% efficiency, 33 dB saturated gain with 200 MHz bandwidth centered at 34 GHz for a 65 kV, 8 A electron beam with 1.5 the ratio of the transverse velocity to the longitudinal velocity are achieved by simulation. The influences of electron beam and RF system parameters, magnetic field on output power, efficiency, bandwidth and gain are discussed. The numerical simulation results are used to develop a Ka band high power gyro klystron amplifier. It is necessary to increase the peak output power and average power, enhance the band-width, get hi