Zhang Luqi, Jiang Yi, Lei Wenqiang, Hu Peng, Guo Jun, Song Rui, Tang Xianfeng, Ma Guowu, Chen Hongbin, Wei Yanyu
Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang, 621900, China.
Department of Physics, Southwest Jiao Tong University, Chengdu, 610031, China.
Sci Rep. 2022 Jun 21;12(1):10449. doi: 10.1038/s41598-022-14587-y.
In this paper, a piecewise sine waveguide (PWSWG) is proposed as the slow-wave structure (SWS) to develop high-power terahertz (THz) traveling wave tubes (TWTs). The PWSWG is an improvement over the rectangular waveguide wherein its two E-planes simultaneously oscillate up and down along the longitudinal direction. The oscillation curve in the H-plane is a piecewise sine curve formed by inserting line segments into the peaks and troughs of the sine curve. The simulation analysis and experimental verification show that the PWSWG offers the advantages of large interaction impedance and excellent electromagnetic transmission performance. Furthermore, the calculation results of beam-wave interaction show that the TWT based on PWSWG SWS can generate a radiated power of 253.1 W at the typical frequency of 220 GHz, corresponding to a gain of 37.04 dB and an interaction efficiency of 6.92%. Compared with the conventional SWG TWTs, the PWSWG TWT has higher interaction efficiency and shorter saturation tube length. In conclusion, the PWSWG proposed in this paper can be considered a suitable SWS for high-power THz radiation sources.
本文提出一种分段正弦波导(PWSWG)作为慢波结构(SWS),用于研制高功率太赫兹(THz)行波管(TWT)。PWSWG是对矩形波导的一种改进,其两个E面沿纵向同时上下振荡。H面内的振荡曲线是通过在正弦曲线的波峰和波谷处插入线段而形成的分段正弦曲线。仿真分析和实验验证表明,PWSWG具有互作用阻抗大、电磁传输性能优异的优点。此外,注波互作用的计算结果表明,基于PWSWG SWS的TWT在220GHz典型频率下可产生253.1W的辐射功率,增益为37.04dB,互作用效率为6.92%。与传统的SWG TWT相比,PWSWG TWT具有更高的互作用效率和更短的饱和管长。总之,本文提出的PWSWG可被认为是一种适用于高功率太赫兹辐射源的慢波结构。