Particle simulation of a sinusoidal corrugation compact L-band coaxial backward wave oscillator

In this paper, a sinusoidal corrugation compact L-band coaxial relativistic backward wave oscillator (BWO) is investigated using the 2.5 D particle simulation code. A field- matching method is presented to obtain the dispersive characteristics of TM₀₁ electromagnetic modes in the sinusoidal corrugation slow wave structure (SWS). Detail physical interaction pictures of the oscillator are presented. Simulation results show that for an electron beam of 700keV and 10kA, a microwave of coaxial TM₀₁ mode is generated with power of 2.2GW and frequency of 1.6GHz when the external guiding magnetic field is about IT. The beam to microwave efficiency is about 30% . The optimized electromagnetic structure of the device is only phi100mmtimes520mm.