Design and PIC simulation of a mega-watt class gyro-twystron

In this paper, the design and Particle-in-Cell (PIC) simulation of an X-band high power gyrotwystron amplifier operating in TE
₀₁
mode is presented for studying its stability and beam wave interaction behaviour. The device includes an input cavity, field free drift tube, and an output waveguide section which is loaded with a lossy dielectric to improve its stability. The complete amplifier is modelled in “CST particle studio” for studying the beam-wave interaction behaviour. The PIC simulation of the amplifier predicted ~ 20MW at 9.87 GHz in the fundamental TE01 mode for the relativistic gyrating electron beam of 440 kV, 240A with a velocity spread of 5%. The amplifier shows saturated gain of ~ 24 dB and an electronic efficiency of ~ 19%.