Simulation Investigation of a 3-GW X-Band Relativistic Backward Wave Oscillator with Low Magnetic Field

A simulation investigation of a gigawatt-class X-band relativistic backward wave oscillator (RBWO) with low magnetic field is presented in this article. The designed and optimized RBWO by the particle in cell (PIC) simulation code CHIPIC, the microwaves with a power of 3.4 GW, a frequency of 9.4 GHz were obtained with a guiding magnetic field of 0.7 T, in which the diode voltage and beam current were configured to be 950 kV and 10.4 kA, respectively, indicating a beam wave conversion efficiency of 34% from PIC simulation. In addition, the radial size of the end of the slow-wave structure is expanded to achieve the efficient flow of electron beams in the RBWO.