Design and experiment of electron optical system for 0.22 THz folded waveguide traveling wave tube
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摘要: 设计了一套0.22 THz折叠波导行波管电子光学系统，详细介绍了电子枪和周期永磁聚焦系统的设计过程，在电子枪电子束束腰与磁系统不匹配情况下，对磁场过渡区进行了优化设计，以此为基础利用磁场仿真软件对磁场进行模拟和优化，并把磁场位形代入电磁仿真软件进行电子束传输仿真，优化后的电子光学系统发射束流10 mA，阴极电压15 kV，束流通过率96%。通过实验验证，流通管束流通过率93%，高频样管束流通过率94%，与设计相符。高频样管实现连续波运行，功率大于0.4 W，3 dB带宽大于12 GHz。Abstract: This paper introduces the design method of the electron optical system for a 0.22 THz folded waveguide traveling wave tube. As the electron beam current is 10 mA and the beam channel radius of the tube is only about 0.1 mm, the PPM(period permanent magnet) focusing system needs to be carefully designed to transmit this beam current from the electron gun to the collector. A tree-electrode Pierce gun is adopted. The electrodes and PPM are optimized to obtain proper beam waist radius and high transmission efficiency. Maxwell is used to calculate the magnetic flux density on the beam line, and CST is used to simulate the beam transmission. The simulation shows that about 96% of the electron beam reaches the collector and is verified by experiments, which gets about 74% transmission efficiency without magnetic modification. After magnetic modification, the transmission efficiency is improved to 94%, and this tube is able to run in DC mode.
期刊类型引用(4)
1. 于文杰，王严梅，何晏彰，刘飞翔，马顺源. 星载栅控行波管电子光学系统设计与实验研究. 真空电子技术. 2021(01): 47-50 . 
百度学术2. 陈招子，陈洪斌，马乔生，雷文强. D波段行波管三级降压收集极的设计. 太赫兹科学与电子信息学报. 2020(05): 766-770 . 百度学术3. 郭祖根，阳志新，姬如静，韩萍，张瑞峰，王琪，王战亮，宫玉彬，巩华荣. 开口磁环的周期聚焦系统仿真分析与实验. 强激光与粒子束. 2019(12): 62-67 . 本站查看4. 尚新文，申鑫，易红霞，肖刘，苏小保. 多级降压收集极过渡区磁系统的计算及优化. 真空科学与技术学报. 2016(10): 1124-1130 . 百度学术其他类型引用(8)
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