Theoretical research on a large beam tunnel, coalesced-mode broadband traveling wave tube

被引：0
作者：
Cui, Zhongtao [1 ]
Yuan, Xuesong [1 ]
Xue, Qinwen [1 ]
Le, Yiwen [1 ]
Zhu, Yunze [1 ]
Cole, Matthew Thomas [2 ]
Yan, Yang [1 ]
机构：
[1] Univ Elect Sci & Technol China, Sch Elect Sci & Engn, Terahertz Sci & Technol Key Lab Sichuan Prov, Chengdu 610054, Peoples R China
[2] Univ Bath, Dept Elect & Elect Engn, Bath BA2 7AY, England
来源：
PHYSICS OF PLASMAS | 2024年 / 31卷 / 12期
基金：
中国国家自然科学基金;
关键词：
OPERATION; DESIGN;
D O I：
10.1063/5.0229915
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
A coalesced-mode, wide bandwidth traveling wave tube (TWT) with a large beam tunnel is herein investigated for use in millimeter-wave and terahertz amplification sources. The high frequency structure and input-output circuits of the TWT are designed to operate in both mode 1 (coalesced TE10-like mode) and mode 3 (coalesced TM11-like mode) at a same operating voltage, allowing a significant increase in the bandwidth. The gain difference between the two modes is reduced to less than 3 dB as the energy transmission is optimized with a large circular beam tunnel. Particle-in-cell simulations are performed at 24 kV with a beam current of 350 mA, and the coalesced-mode TWT is predicted to operate in two atmospheric windows, with a maximum output power of 530 W and a peak linear gain of 36 dB. The 3 dB bandwidth is predicted to be 41.6 GHz, ranging from 103.1 to 144.7 GHz, corresponding to a relative bandwidth of over 33%.
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页数：6
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