1. Electron-optical system for dual radial sheet beams for Ka-band cascaded angular log-periodic strip-line traveling wave tube.
- Author
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He, Tenglong, Wang, Shaomeng, Wang, Zhanliang, Shao, Wei, Xu, Duo, Li, Xinyi, Wang, Hexin, Gong, Huarong, Lu, Zhigang, Duan, Zhaoyun, Aditya, Sheel, and Gong, Yubin
- Subjects
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TRAVELING-wave tubes , *CURVED surfaces , *DISTRIBUTION (Probability theory) , *ELECTRON beams - Abstract
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. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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