地面模拟空间电子环境束流均匀化设计  

Design of beam homogenization for ground simulation of space electron environment

作　　者：王常强 向益淮[1] 李金海[1] 杨京鹤 WANG Changqiang;XIANG Yihuai;LI Jinhai;YANG Jinghe(China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]中国原子能科学研究院,北京102413

出　　处：《核技术》2020年第12期25-32,共8页Nuclear Techniques

基　　金：中国科协青年人才托举工程项目(No.2018QNRC001)资助。

摘　　要：通过在地面建设装置来模拟空间高能电子环境,能够有效地对航空航天器件在地外空间遭遇电子引起的相关效应进行研究。在模拟装置中,高能电子由电子直线加速器提供,其输出束斑大小为毫米量级,而模拟试验需要大面积且非常均匀的电子辐照环境,所以需要通过一段束流输运线处理,使束流同时满足辐照面积和均匀性要求。本项目的模拟装置空间紧凑,束流输运线短,辐照面积大,利用单一的二维扩束均匀化方案无法实现,因此采用了一种扫描加扩束的方案。根据输运线入口和出口束流参数要求,设计将螺线圈、α-磁铁、扫描磁铁、四极磁铁、聚焦六极磁铁等元件组合使用。通过元件参数匹配和束流校正,使不同能量的电子束在辐照平面处满足辐照面积和均匀度的要求。利用束流跟踪软件仿真计算了0.5 MeV、2.5 MeV和5 MeV束线,束流在不同辐照面积的均匀度均优于90%,满足指标要求。[Background]The effect of high-energy electrons bombardment on the integrated circuit(IC)for aerospace can be studied by the simulated space electron environment device on the ground.In the device,the highenergy electrons are provided by the electron linear accelerator,and the output beam spot is only on the order of millimeters while the experiment requires a large-area uniform electron irradiation area.[Purpose]This study aims to process the beam transmission line to meet irradiation area and uniformity requirements of short beam transmission line and large irradiation area.[Methods]Two-dimensional homogenized beam expansion scheme was designed with the combination of beam expansion and scanning.According to the beam parameters output by the linear accelerator,the solenoid,α-magnet,scanning magnet,quadrupole magnets,focus sextuple magnet and other beam transmission line elements were taken into consideration simultaneously.By adjusting the element parameters through the electron beam tracking code,the electron beam with different energies of 0.5 MeV,2.5 MeV and 5 MeV were matched with the required irradiation area and uniformity on the irradiation plane.[Results]Simulation results show that the beam uniformities in different irradiation areas for 0.5 MeV,2.5 MeV and 5 MeV beamline are better than 90%.[Conclusions]The beam homogenization design proposed in this study for ground simulation of space electron environment meets the requirement of effect of high-energy electrons bombardment in extraterrestrial space.

关 键 词：空间电子环境 束流均匀化 聚焦六极磁铁 光路设计 

分 类 号：TL99[核科学技术—核技术及应用]