Design and Simulation of 1.0 THz Staggered Double Vane Backward-wave Oscillator

THz backward-wave oscillator (BWO) is a high-power, tunable frequency, and high-frequency terahertz radiation source. In this paper, the high-frequency system and electron optics system of a 1.0 THz BWO are studied. And the staggered double vane structure is used to improve the efficiency of the beam wave interaction efficiency. At the operating voltage of 25 kV and the electron beam current of 20 mA, the stable output power of BWO is 554mW, and the oscillation frequency is 1.029 THz. We also designed the electron optics system of a 1.0 THz BWO, in which the cathode excitation current reached 20mA at an operating voltage of 25 kV. Under the influence of a uniform magnetic field of 1.2 T, the transmission was stable, and the pass rate was over 99%.