Design of 0.14 THz watt-level folded waveguide traveling wave tube

Based on our previous work which introduced an explicit method to design the slow wave circuit of a 0.14 THz broadband folded waveguide traveling wave tube, a 0.14 THz watt-level folded waveguide traveling wave tube has been designed, with a set of slow wave structure parameters determined by analyzing the influence of structure dimensions on its cold characteristics using CST MWS. Over 6 W output power is attained with 3D PIC method by means of CST PS, at around 0.14 THz, as the input power is 20 mW. A transmission tube was fabricated in order to verify the designed electron-optical system. Measurement results show an over 80% electron transmission rate.