Theoretical design and particle-in-cell simulation of moderate-energy P-band relativistic backward wave oscillator

A moderate-energy P-band relativistic backward wave oscillator (RBWO) is proposed and investigated by using the 2.5D fully electromagnetic particle-in-cell code, KARAT. A double corrugated configuration is designed in the coaxial slow wave structure (SWS) of the moderate-energy P-band RBWO, and thus enlarges the temporal growth rate and the beam-wave interaction space of the RBWO, resulting in larger power capacity and shorter microwave output saturation time. The presented P-band RBWO has an increase of about two times compared with the conventional one in the radial range of the beam-wave interaction space, with almost the same period of SWS. The simulation results show that a microwave with the power of 267 MW, frequency of 867 MHz and efficiency of 30% is obtained with the diode voltag