真空电子技术Issue(6)：7-12,6.DOI:10.16540/j.cnki.cn11-2485/tn.2025.06.02
太赫兹行波管碳纳米管冷阴极电子枪及磁聚焦系统仿真设计
Simulation and Design of Carbon Nanotube Cold Cathode Electron Gun and Magnetic Focusing System for THz Traveling Wave Tubes
TANG Qian-qian 1SHI Zi-wei 1ZHANG Jun-jie 1ZHANG Xiao-bing 1XIAO Mei1
作者信息
- 1. School of Electronic Science and Engineering,Southeast University,Nanjing 210096,China
- 折叠
摘要
Abstract
To meet the challenge of sharply reduced electron beam channel dimensions in THz traveling wave tubes,the simulation investigation of a carbon nanotube cold cathode electron gun and a magnetic focusing system is carried out.The carbon nanotube cold cathode electron gun,modeled after the spherical Pierce electron gun de-sign,comprises cathode,pre-focusing electrode,grid,and anode.The uniform magnetic focusing system consists of two radially opposed magnetic rings,with a 32 mm length working zone.By utilizing CST electromagnetic simula-tion software,a carbon nanotube cold cathode electron gun capable of generating ultra-fine,high emission current density electron beam with excellent laminarity is designed,along with a uniform permanent magnet focusing sys-tem ensuring high field homogeneity.Joint simulation of the electron gun and magnetic system demonstrated 100％beam transmission through the channel,with maximum beam radius of 22.45 μm,ripple ratio of 60％,and current density of 378 A/cm2.This scheme provides a theoretical basis for the proposed carbon nanotube cold cathode electron gun and magnetic focusing system applied in THz traveling wave tubes.关键词
行波管/电子枪/均匀永磁聚焦系统/碳纳米管冷阴极Key words
Traveling wave tube/Electron gun/Uniform permanent magnet focusing system/Carbon nano-tube cold cathode分类
信息技术与安全科学引用本文复制引用
TANG Qian-qian,SHI Zi-wei,ZHANG Jun-jie,ZHANG Xiao-bing,XIAO Mei..太赫兹行波管碳纳米管冷阴极电子枪及磁聚焦系统仿真设计[J].真空电子技术,2025,(6):7-12,6.
