High Power Angular Radial Staggered Vane Backward Wave Oscillator at W-Band

A angular radial staggered vane (ARSV) slow wave structure (SWS) is proposed for high power vacuum devices. Cooperating with an angular radial sheet electron beam (ARSEB), the SWS is designed for a W-band backward wave oscillator (BWO). The high frequency characteristics of the proposed SWS are studied by using simulation. The effects of the angle have been found out. The steady transmission of an angular sheet electron beam has been realized using a radial uniform magnetic field of ~ 1 T. The beam wave interactions are studied using particle-in-cell (PIC) simulation, a peak output power of 21 kW has been achieved at 100 GHz, with an electron efficiency of about 5%. The study of frequency versus beam voltage shows that the proposed BWO can be tunable in the frequency range of 79.8 GHz - 104.7 GHz and the output power is higher than 13 kW. The fabrication and cold test results are presented at the end.