Efficient Output Mode Converter for 30 GHz Gyroklystron at IAP

Abstract

An output mode converter for Ka-band multi-MW gyroklystron in the Institute of Applied Physics (IAP) operating in the TE 53 mode is suggested. Two variants of the converter, aimed for different applications, are presented: the TE 53 to TE 01 mode converter with power output along the device axis and the TE 53 mode to Gaussian wavebeam quasioptical converter with a visor. The suggested designs include the built-in electron beam collector. The converters were designed using a new synthesis algorithm, which implies iterative improvement of the waveguide wall shape in order to achieve high efficiency. The calculation results were proven by HFSS simulation and low-power tests of one version of the converter.