Design and Study of High Efficiency Folded Waveguide Slow Wave System.

This paper introduces an effective method to improve the beam-wave interaction efficiency of folded waveguide Travelling-Wave Tube in terahertz band. In order to improve the electron efficiency, the high frequency circuits are optimized and the variable period technology is used to optimize the design of dynamic variable period FWG TWT, and the particle simulation is performed using the three-dimensional electromagnetic field software Microwave Tube Simulation Software (MTSS). The simulation results show that the output power of dynamic variable period FWG TWT is over 78 W in 214 GHz - 223 GHz frequency range and the electron efficiency is greater than 7.2 %. Compared with uniform periodic structure, the saturated output power of dynamic variable period structure increases from 55.06 W to 86.41W, the maximum electron efficiency raises from 4.987 % to 7.94 % in 220 GHz.