磁谱仪（AMS）超强磁场中硅微条核辐射探测器的磁阻效应抑制研究

项目名称： 磁谱仪（AMS）超强磁场中硅微条核辐射探测器的磁阻效应抑制研究

项目编号： No.U1531114

项目类型： 联合基金项目

立项/批准年度： 2016

项目学科： 天文学、地球科学

项目作者： 王方聪

作者单位： 兰州大学

项目金额： 45万元

中文摘要： 硅微条轨迹探测器（Silicon trackers）是磁谱仪（AMS）中六个探测器中最重要的探测器，用于探测宇宙中奇异粒子的种类和能量等，其本质上就是本小组所研究的硅微条核辐射探测器（silicon microstrip detectors）的叠加组合而成。工作于超强磁场环境中，其探测灵敏度和范围与其周围超强磁体所产生的磁场强度有很大关系，磁场强度越大越灵敏，粒子能量探测范围越宽（因此AMS02原计划使用超导磁体）。在之前的研究当中，本小组发现硅微条核辐射探测器在强磁场（2T以上）中的存在非常明显的磁阻效应（4T低温下出现1200%磁阻），磁阻的出现会严重影响硅微条核辐射探测器的探测结果，并且其结果与粒子穿过探测器的结果相互混和，引起不可区分并不可去除和辨别的误差和错误。本项目旨在深入探索AMS超强磁场中磁电阻效应机理，探索抑制磁电阻效应策略，以消除AMS超强磁场中由磁阻引起的误差为目标。

中文关键词： 阿尔法磁谱仪；硅微条轨迹探测器；硅微条核辐射探测器；磁阻效应；完全抑制

英文摘要： Silicon trackers is one of the most important detectors in six detectors of the Alpha Magnetic Spectrometer, for detecting singularity particles’ type and energy in the universe , in fact it is a combination of several silicon microstrip nuclear radiation detectors. Working in ultra strong magnetic field environment, there is a great relationship between the detection sensitivity and the surrounding ultra strong magnetic field generated by the super magnet: stronger and more sensitive, particle energy detection range is wider (thus AMS-02 originally planned to use superconducting magnets). In our previous study, we found there was an obvious magnetoresistance (such as 1200% in 4T) when detectors were tested in a strong magnetic field (more than 2T). Such obvious magnetoresistance will seriously affect the detection results of the silicon microstrip nuclear radiation detector, and these results are mixed with the results caused by particles getting through the detectors—this problem will cause indistinguishable errors and mistakes which would not be removed and identificated. The purpose of this project is to further explore the magnetoresistance effect in ultra strong magnetic field in AMS, to explore the strategy on how to restrain magnetoresistance, to eliminate the errors caused by magnetoresistance in AMS.

英文关键词： Alpha Magnetic Spectrometer;Silicon trackers;Silicon microstrip nuclear radiation detectors;magnetoresistance effec;completely restrain