Sheet Electron Optical System for a 1.03-THz Traveling-Wave Tube
Pengcheng Yin, Jin Xu, Ruichao Yang, Jinjing Luo, Jian Zhang, Dongdong Jia, Wenli Fan, Yue Ouyang, Lingna Yue, Jinchi Cai, Hairong Yin, Guohui Zhao, Guo Guo, Lin Xu, Wenxiang Wang, Wenxin Liu, Yanyu Wei
Abstract
The electron optical systems (EOS) play a vital role in vacuum electron devices (VED). This letter reported the design and experiments of the sheet EOS for the 1.03 THz traveling wave tube (TWT). A high-current-density sheet electron beam (SEB) electron gun generating up to 20.3-mA at 22.4-kV is designed, based on the requirements of this TWT. Due to the very high operating frequency, more than 1 THz, the miniature tunnel and beam waist with a dimension of 0.05 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">*</sup> 0.148 mm and 0.025 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">*</sup> 0.114 mm, respectively, will lead to a very high beam current density (906.9 A/cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ). Therefore, a 1-Telsa uniform magnetic system is designed, to ensure such a high-current-density SEB passes through the 27-mm tunnel. Finally, the primary experiments indicate that 7.56-mA current reaches the collector.