管径渐缩式静电透镜束流动力学研究  

Beam dynamics study of electrostatic lens with tube diameter gradually decreasing

作　　者：尹毅 张红强 彭雄刚 况鹏[2] 张鹏[2] 刘福雁 田丽霞 李润东[3] 杨鑫[3] 曹兴忠[2] 王宝义[2] YIN Yi;ZHANG Hongqiang;PENG Xionggang;KUANG Peng;ZHANG Peng;LIU Fuyan;TIAN Lixia;LI Rundong;YANG Xin;CAO Xingzhong;WANG Baoyi(School of Nuclear Science and Engineering,East China University of Technology,Nanchang 330013,China;Multi-discipline Research Center,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]东华理工大学核科学与工程学院,南昌330013 [2]中国科学院高能物理研究所多学科研究中心,北京100049 [3]中国工程物理研究院核物理与化学研究所,绵阳621900

出　　处：《核技术》2023年第10期1-7,共7页Nuclear Techniques

基　　金：国家重点研发计划(No.2019YFA0210002);国家自然科学基金(No.U1930103,No.12075056)资助。

摘　　要：电透镜是横向压缩带电粒子束的常用技术手段,在获得高空间分辨、高亮度等高品质聚焦电子束/离子束/正电子束方面发挥着重要作用。针对低能、大束斑带电粒子束的聚焦过程,本文设计了基于管径渐缩式简单电极结构的电透镜聚焦方法,采用SIMION模拟结合电子束实验的方式对该电透镜中涉及的关键技术进行了研究,研究了透镜聚焦效率及聚焦束斑等核心性能的影响因素及分布规律。结果显示:通过合理布局透镜结构和优化电压配置,能够实现对初始大口径电子束的有效压缩,同时确保聚焦效率达到80%以上。本文提出的这种简单电极结构电透镜聚焦方法,具有显著的横向压缩优势,在反应堆正电子源等多束流聚焦场景中具有广泛的应用前景。[Background]The electrostatic lens plays an important role in obtaining high quality focused electron/ion/slow positron beams with high spatial resolution and brightness.A novel electric lens,composed of simplified electrode structures with tube diameter gradually decreasing,is proposed for focusing charged particle beams with low energy and large spot size.[Purpose]This study aims to investigate the beam dynamics of this designed electrostatic lens for validation.[Methods]Based on overall structure of electric lens focusing system,the charged particle optical simulation software SIMION was employed to optimize the parameters of this focusing system.Then combined with electron beam experiments,the key technologies involved in the electronic lens were studied in detail,including influencing factors,their distributions,and the focusing performance of the lens.[Results]The results show that the large transverse space of the initial electron beam can be compressed effectively by arranging the electrode structure and electric potential of the lens,with focusing efficiencies exceeding 80%.[Conclusions]The focusing method proposed in this study has significant lateral compression advantages with wide application prospects in many focusing scenarios of different charged particle beams,such as reactor positron sources.

关 键 词：静电透镜 横向聚焦 SIMION仿真 电子束实验 束斑 

分 类 号：TL824[核科学技术—核技术及应用]