MW-level 0.34 THz wave radiation from slow-wave device with relativistic hollow thin-wall electron beam

Abstract

A rectangularly corrugated relativistic slow-wave oscillator is designed to generate the MW-level 0.34 THz wave radiation. By using large overmoded ratio the manufacturing difficulty is efficiently decreased, while relativistic hollow thin-wall electron beam is adopted to suppress the mode competition. Simulations based on a 2.5-D particle-in-cell (PIC) code UNIPIC predict an output power up to 131MW at the frequency of 0.34 THz with conversion efficiency almost 10.8% when beam voltage is about 382kV, current 3.18kA, and the confined magnetic field 5.2T.