Ruofan Wang, Jin Xu, Lingna Yue, H. Yin, G. Zhao, Wenxiang Wang, Y. Gong, J.J. Feng, Yanyu Wei
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Stability Improvement of Electron Gun for Millimeter Wave TWTs by Immersed Flow Focusing System
This paper introduces a high-stability electron optical system for millimeter wave traveling wave tubes. Firstly, a circular electronic injection Pierce electron gun is designed. The electron channel radius is 0.2mm, the current is 90mA. Then the immersed flow method was used to design a ppm focusing system with a magnetic field period of 7.3 mm and a peak value of 4900 Gauss. The stability of the immersed flow electron gun is compared with the gun under a conventional ppm magnetic field in consideration of thermal deformation and assembly errors.
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