Liu Wenxin, Guo Jiaqi, Zhao Chao, Guo Xin, Wang Meng
Key Laboratory of High Power Microwave Sources and Technologies, Aerospace Information Research Institute, Chinese Academy of Science, Beijing, 100190, China.
School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Science, Beijing, 100049, China.
Sci Rep. 2020 Aug 13;10(1):13680. doi: 10.1038/s41598-020-70016-y.
The sheet electron beam (SEB), for which is the low current density and large current, is highly attractive in the region of millimeter wave and terahertz vacuum electronic devices (VEDs). A uniform permanent magnet (UPM) electronic optical system (EOS) driven by a SEB for 220 GHz traveling wave tube (TWT) is designed in present work, in which the voltage and current for SEB is 17 kV and 0.3 A, respectively. For obtaining the stable high transmission rate EOS, the characteristics of SEB in UPM EOS are studied, including the emittance, orbital angle, and beam trajectories, which are discussed through the CST simulation. The results show that the emittances in the x-direction are varied from 0.003 to 0.016 mm rad and in y-direction are various from 1 × 10 to 3 × 10 mm rad, respectively, keeping below than 2.5 × 10 mm rad during transmission, which guarantees the stability of SEB in y-direction. For the design of complete EOS, the normal rectangular collector is used, in which the SEB is uniformed scattering.
片状电子束（SEB）具有低电流密度和大电流的特点，在毫米波和太赫兹真空电子器件（VED）领域极具吸引力。本文设计了一种由片状电子束驱动的用于220GHz行波管（TWT）的均匀永磁（UPM）电子光学系统（EOS），其中片状电子束的电压和电流分别为17kV和0.3A。为了获得稳定的高传输率电子光学系统，研究了均匀永磁电子光学系统中片状电子束的特性，包括发射度、轨道角和束流轨迹，并通过CST模拟进行了讨论。结果表明，x方向的发射度在0.003至0.016mm·rad之间变化，y方向的发射度在1×10至3×10mm·rad之间变化，在传输过程中均保持在2.5×10mm·rad以下，这保证了片状电子束在y方向的稳定性。对于完整电子光学系统的设计，采用了普通矩形收集器，其中片状电子束发生均匀散射。
