星载粒子探测器中的偏转磁铁设计研究

Design of the sweeping magnet in the space particle detector

在对空间带电粒子进行探测时,大量电子的混入会减少半导体探测器的寿命和工作效率,同时电子的噪声本底也是影响测量精度的重要因素.为了减少电子的影响,需要在离子探测器的探头中加上合适的偏转磁铁用来屏蔽电子的干扰.本文中,磁铁的结构设计借鉴了国外的成功经验,并通过有限元的方法来计算磁场的强度,选择合适的方案消除漏磁的影响以及模拟电子在磁场的轨迹来估计磁场对电子的偏转能力.并用理论计算的数据与实验结果进行了比对,得到了比较好的结果.最后针对空间粒子探测中的偏转磁铁设计提出了一些建议.加偏转磁场的技术也是我国在星载粒子探测器中的首次应用.

When we detect space particles, electrons from space will damage the detector and reduce its life. The electrons can also be the back ground and reduce sensitivity for detecting of nuclei. To solve this problem,we use the sweeping magnet to deflect the electrons. Through the finite-element analysis, we can design the sweeping magnet and realize the ability of deflecting electrons. To avoid the leakage of the magnetic field, the shielding of the magnet has to be considered. In the article, we compare the simulation results with the experiment test data. Finally, some suggestions have been made for the design of the magnet.