Analysis and simulation of input cavity of gyroklystron amplifier

Input cavity transforms the H10 mode in waveguide to H011 mode in inner resonant cavity, H011 mode is used to modulate the transverse velocity of gyroelectron beam. In this paper, an approximate analysis method is presented, theoretical analysis and numerical calculations have been completed, and then primitive structure and geometric parameters of the input cavity can be obtained in minutes. Afterward, HFSS code is used to simulate accurately and revise approximate analysis. Based on a large number of calculations and simulations, the optimal input cavity meeting the design requirement is attained.