Design and Simulation of an X-Band RBWO using Non-uniform Bragg Structure

Abstract

An X-band relativistic backward wave oscillator using a non-uniform Bragg structure as its slow wave structure and cut-off neck waveguide reflector is designed to increase its beam-wave interaction efficiency. The non-uniformity in Bragg introduces variable coupling impedance and velocity tapering in order to keep the synchronism between the RF wave and the electron beam. In the present work, a two-way helically corrugated single fold Bragg structure used that efficiently converts the backward propagating TM01 mode to forward propagating linearly polarized HE11mode. The beam-wave interaction efficiency of the Bragg based RBWO is calculated as \sim 12%. © 2019 IEEE.