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离子轰击二次发射电子枪束流引出问题的仿真与实验研究

谢洋，刘莹*，刘俊标*，王鹏飞，王大正，高召顺，李亮
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2024年 第43卷 第3期:  1000-6281（2024）03-309-010     下载地址：

离子轰击二次发射电子枪束流引出问题的仿真与实验研究

谢洋，刘莹*，刘俊标*，王鹏飞，王大正，高召顺，李亮

（1.南昌大学先进制造学院，江西南昌 330031；2.中国科学院电工研究所，北京 100190；3.中国科学院大学，北京100049；4.中国科学院空间应用工程与技术中心，北京 100094）

摘   要   为应对电子束荧光技术对电子枪的需求，本文开展了离子轰击二次发射电子枪的研究工作。首先介绍了离子轰击二次发射电子枪的工作原理，将工作过程划分为离子产生及引出、二次电子产生和引出两个部分并展开理论分析；基于辉光放电原理建立了简化的空气放电仿真模型，利用Comsol软件获得了正离子密度及其分布；对于加速室内的二次电子发射过程采用静电聚焦的方式聚焦电子束，利用Comsol软件基于Nelder-Mead算法获得二次电子引出的最佳结构参数；最后，搭建了电子枪原理样机，实验结果表明：采用空气作为工作气体，利用气体放电产生的正离子轰击金属铝使其发射二次电子，最终获得了加速电压为20 kV，束流强度为1.6 mA的电子束，完成了此类电子枪的原理验证并为性能提升工作奠定基础。

关键词   电子枪；离子轰击二次电子发射；气体放电；电子束荧光技术

中图分类号：TN14；TN16     文献标识码：A        doi：10.3969/j.issn.1000-6281.2024.03.006

    

Simulation and experimental study on the beam extraction of ion bombardment secondary emission electron gun

XIE Yang1，2，LIU Ying1*，LIU Junbiao2，3*，WANG Pengfei2，WANG Dazheng2，

GAO Zhaoshun2，3，LI Liang4

（1.School of Advanced Manufacturing, Nanchang University, Nanchang Jiangxi 330031；2.Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190；3.University of Chinese Academy of Sciences, Beijing 100049；4. Technology and Engineering Center for Space Utilization, Chinese Academy of Sciences, Beijing 100094,China)

Abstract    To meet the demand of electron beam fluorescence technology for electron guns, this paper performed the research on ion bombardment secondary emission electron guns. The working principle of ion bombardment secondary emission electron gun was firstly introduced. The working process was divided into two parts: ion generation and extraction, and Secondary electrons generation and extraction. A simplified air discharge simulation model was established based on the principle of glow discharge. The density and distribution of positive ions were obtained using Comsol software. For the emission process of secondary electrons in the acceleration chamber, the electron beam was focused by electrostatic focusing. The best structural parameters of Secondary electrons extraction were obtained by using Comsol software based on Nelder Mead algorithm. Finally, an electron gun prototype was constructed. The experimental results showed that the positive ions produced by air discharge bombarded the metal aluminum to make it emit Secondary electrons. An electron beam with an acceleration voltage of 20 kV and a beam intensity of 1.6 mA was obtained. This work confirmed the principle of electron gun and laid the foundation for performance improvement.

Keywords   electron gun; ion bombardment secondary electron emission; gas discharge; electron beam fluorescence measurement

 

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