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离子辐照引起的材料微结构变化是一个复杂的过程,用加速器-电镜联机装置可原位观察载能离子束辐照引起的材料微结构演变。武汉大学加速器-电镜联机装置由1台2×1.7 MV串列加速器、1台200 kV离子注入机和1台200 kV透射电镜组成,通过自行设计的传输系统实现联机。本文介绍联机装置的光路布局,给出了静电加速器离子动力学计算程序LEADS(linear and electrostatic accelerator dynamics simulation)优化计算的结果,提出了两种改进方案,并用LEADS对改造后的加速器-电镜联机中离子运动进行了计算。结果显示,调整现光路二单元四极透镜的同时,在200 kV注入机90°偏转磁铁至电镜之间增加1个二单元静电四极透镜,将提高该系统中离子束传输效率。
The microstructure change caused by ion irradiation is a complex process. The microstructure evolution of the material caused by ion beam irradiation can be observed in situ by accelerator-electron microscopy. Wuhan University Accelerator - Electron Microscope online device consists of a 2 × 1.7 MV tandem accelerator, a 200 kV ion implanter and a 200 kV transmission electron microscope, through its own design of the transmission system to achieve online. This paper introduces the optical layout of on-line devices, and presents the results of the optimization calculation of LEADS (linear and electrostatic accelerator dynamics simulation) program. Two improved schemes are presented, and the modified accelerator- Ion movement was calculated. The results show that while adjusting the two-unit quadrupole lens of the present optical circuit, adding one two-unit electrostatic quadrupole lens between the 90 ° deflection magnet of the 200 kV implanter and the electron microscope will improve the ion beam transmission efficiency in the system.