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
张芳 1,2,*董志伟 1,2杨温渊 1,2董烨 1,2
作者单位
1 北京应用物理与计算数学研究所, 北京 100094
2 中国工程物理研究院 太赫兹研究中心, 四川 绵阳 621900
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.
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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.

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