Numerical simulation of dual-frequency relativistic backward wave oscillator

Physical model for the X-band dual-frequency coaxial relativistic backward wave oscillator(RBWO) was suggested. The dispersion equation and the dispersion properties of the coaxial SWS were numerically investigated. The properties of dual-frequency RBWO were investigated and optimized with electromagnetic simulation method. The optimized parameters are as follows: corrugation period numbers are 10 and 4, corrugation periods are 0.50 cm and 0.73 cm, and corrugation amplitudes are 0.13 cm and 0.21 cm for the first and the second sections respectively. The average radius of slow wave structure is 2.9 cm. The results show that steady dual frequencies microwave power outputs are generated with operating voltage of 510 kV, beam current of 9.4 kA and external guiding magnetic field intensity of 0