强激光与粒子束, 2014, 26 (4): 043101, 网络出版: 2014-04-24
345 GHz折叠波导行波管中电磁传输损耗的分析计算
Electromagnetic field’s transmission attenuation in 345 GHz folded waveguide traveling-wave tube
摘要
利用电导率等效方法对345 GHz折叠波导行波管中的电磁信号的传输损耗进行了仿真研究,考察了流通管孔径、加工粗糙度等对冷腔传输损耗的影响。结果表明,流通管孔径较大或加工粗糙度较大都会导致电磁信号传输严重衰减。模拟分析了热腔中电磁信号衰减对慢波结构净增益、带宽、最佳周期数等器件特征参数的影响,结果显示,电磁信号衰减会使得增益下降和带宽降低。
Abstract
The equivalent-conductivity method is applied to the simulation work of electromagnetic transmission attenuation for 345 GHz FWG-TWT(folded waveguide traveling-wave tube). The paper studies the “cold” model of slow-wave structure and does research on the big factors which influence transmission attenuation, such as the beam tunnel’s diameter, processing roughness. A big beam tunnel or a large roughness will result in serious electromagnetic attenuation. The paper also studies the “hot” model of slow-wave structure, and analyzes the effects of electromagnetic attenuation on gain, bandwidth, best length of slow wave structure. Results show that electromagnetic attenuation causes gain reduction and bandwidth decreases.
张芳, 董志伟, 杨温渊, 董烨. 345 GHz折叠波导行波管中电磁传输损耗的分析计算[J]. 强激光与粒子束, 2014, 26(4): 043101. Zhang Fang, Dong Zhiwei, Yang Wenyuan, Dong Ye. Electromagnetic field’s transmission attenuation in 345 GHz folded waveguide traveling-wave tube[J]. High Power Laser and Particle Beams, 2014, 26(4): 043101.