Electron-optical system for dual radial sheet beams for Ka-band cascaded angular log-periodic strip-line traveling wave tube
Tenglong He,
Shaomeng Wang,
Zhanliang Wang,
Wei Shao,
Duo Xu,
Xinyi Li,
Hexin Wang,
Huarong Gong,
Zhigang Lu,
Zhaoyun Duan,
Sheel Aditya,
Yubin Gong
Affiliations
Tenglong He
National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu 610054, China
Shaomeng Wang
National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu 610054, China
Zhanliang Wang
National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu 610054, China
Wei Shao
National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu 610054, China
Duo Xu
National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu 610054, China
Xinyi Li
National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu 610054, China
Hexin Wang
National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu 610054, China
Huarong Gong
National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu 610054, China
Zhigang Lu
National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu 610054, China
Zhaoyun Duan
National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu 610054, China
National Key Laboratory of Science and Technology on Vacuum Electronics, School of Electronic Science and Technology, University of Electronic Science and Technology of China, Chengdu 610054, China
A novel electron-optical system is proposed for dual azimuthally stacked radial sheet electron beams (ARSEBs). The two sheet beams are emitted from curved surfaces of two cathodes and are focused by a focusing electrode, which is carefully designed to produce a symmetric field distribution for the two beams and to avoid interference between the beams. A common tunable periodic cusped magnetic focusing system is also designed to focus the two ARSEBs. The dual sheet beams are used in a traveling wave tube (TWT) consisting of a cascade of two azimuthally supported angular log-periodic strip-line (ASALS) slow-wave structures (SWSs). The transmission efficiency in the presence of beam–wave interaction is 93%. The particle-in-cell simulation results show that for a beam voltage of 4400 V and a current of 0.39 A, the proposed cascaded TWT has a maximum gain of 32.5 dB at 35 GHz and a maximum output power of 180 W; this is a significant gain improvement over a TWT using a single ASALS SWS.
