Optimization Design of Gyrotron Quasi-optical Mode Converter Launcher

An optimized design results of a launcher for 94GHz $\mathbf{TE}_{\pmb{62}}$ mode gyrotron quasi-optical mode converter are given in this paper. The launcher is designed by coupling mode theory and has two stages of perturbations. Under the condition that the original perturbation length remains unchanged, the perturbation amplitude is optimized and the variation of the perturbation amplitude along the axis is obtained. The simulation results show that the beam launched by the optimized launcher has no side lobe at the position of mirror 1 compared with that before optimization.