高增益分离打拿极电子倍增器设计  

Design of High-gain Separated Dynode Electron Multipliers

作　　者：贺峦轩 陈萍[1] 李洁[2] 刘虎林[1] 田进寿[1] 胡文波[2] 吴胜利[2] HE Luan-xuan;CHEN Ping;LI Jie;LIU Hu-lin;TIAN Jin-Shou;HU Wen-Bo;WU Sheng-Li(Key Laboratory of Ultra-fast Photoelectric Diagnostics Technology,Xi'an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi'an 710119,China;Key laboratory of Physical Electronics and Devices,Ministry of Education,School of Electronic Science and Engineering,Xi’an Jiaotong University,Xi'an 710049,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院西安光学精密机械研究所中国科学院超快诊断技术重点实验室,陕西西安710119 [2]西安交通大学电子物理与器件教育部重点实验室电子科学与工程学院,陕西西安710049 [3]中国科学院大学,北京100049

出　　处：《真空电子技术》2024年第6期10-17,35,共9页Vacuum Electronics

基　　金：国家重点研发计划资助项目(2021YFF0700800);中国科学院青年创新促进会基金(2021402);陕西省杰出青年科学基金(2023-JC-JQ-09)。

摘　　要：利用CST仿真软件,建立了一套高性能、双增益工作模式分离打拿极电子倍增器仿真模型,依此分析分离打拿极电子倍增器结构参数和电压分配对其增益的影响规律,在此基础上优化设计参数,完成26级分离打拿极电子倍增器设计方案。此设计方案具有模拟、计数双工作模式切换功能,以满足对不同通量的入射离子无失真探测需求,同时减小打拿极二次电子发射薄膜的无效工作时间,延长电子倍增器工作寿命。最终在负高压1500 V和正高压1000 V共同工作条件下,分离打拿极电子倍增器模拟输出增益为2.02×10~6,计数输出增益可以达到4×10~7。By using CST simulation software,a simulation model of high-performance dual-gain-mode-sepa-rated dynode electron multiplier is established.The effects of structural parameters and voltage distribution on its gain are analyzed.Based on this analysis,parameters are optimized and a 26-stage dynode electron multiplier is designed.The design features dual-mode switching between simulation and counting to meet the distortion-free detection requirements of incident ions with different fluxes.Simultaneously,it reduces the ineffective working time of the dynode secondary electron emission film,and extends the lifetime of the electron multiplier.Under a negative high voltage of 1500 V and a positive high voltage of 1000 V,the simulation output gain of the separa-ted dynode electron multiplier is 2.02×106,and the counting output gain can reach 4×107.

关 键 词：电子倍增器 CST仿真 结构优化 高增益 

分 类 号：TN152[电子电信—物理电子学]