Si-Csl(TI)望远镜探测系统用于大动态范围空间重离子鉴别与测量的研究

Development of a Large Dynamic Range Si-CsI(Tl) Telescope Detection System for a Space Heavy Ion Identification and Measurement

太阳极轨射电望远镜(SPORT)是一颗从事太阳活动研究的卫星。重离子探测仪是其中的高能粒子探测仪的关键组成部分。鉴于重离子探测仪对多种类离子(2≤Z≤26)的鉴别和大范围能段(8～300 Me V/u)的测量需求,中国科学院近代物理研究所设计并研制了一套Si-Cs I(Tl)望远镜探测系统样机,这套望远镜系统由1个Si探测器、1个入射面为正六边形的CsI(Tl)晶体及其专用电子学系统构成。利用兰州重离子加速器冷却储存环系统(HIRFL-CSR)提供的高品质束流对这套望远镜探测系统样机进行了在束测试,完成了种类为2≤Z≤18的重离子直接测量与鉴别,利用直接测量的重离子,进行外推得到,最高测量要求的300MeV/u Fe离子也在设计要求的范围内。实验结果显示这套望远镜探测器样机满足空间中对大范围能段重离子探测的设计需求,该套方案为SPORT计划中的重离子探测仪的设计及建造奠定了很好的技术基础。

Solar Polar Orbit Radio Telescope（SPORT） project, aimed at solar activities and solar atmosphere,is a satellite-borne apparatus which is composed by many sub-payloads and is under development in China. High Energy Heavy Ion Telescope（HEHIT） is one of most key sub-payloads in this project, and the main purpose of HEHIT is to identify space heavy ions（2≤Z≤26） with a broad energy range（8~300 Me V/u）. In this paper,a prototype telescope of HEHIT, which includes a silicon detector, a CsI（Tl） crystal with regular hexagonal incident plane and customized electronic system, has been developed in the Institute of Modern Physics, Chinese Academy of Sciences（IMP, CAS）. To obtain the performance of the prototype telescope, this telescope was tested with high quality beams provided by the accelerator of Heavy Ions Facility and Cooler-Storage-Ring in Lanzhou（HIRFL-CSR）. The heavy ions ranging from Z = 2 to Z = 18 were clearly identified and measured from the beam test and an extrapolation was also done reasonably and it showed that the prototype detector could meet the requirement of t Fe（Z = 26） with energy up to 300 MeV/u. In a word, this prototype telescope could satisfy the requirements of the measured heavy ions in the future SPORT project and this scheme of telescope will provide a favorable technique in the future design and construction of HEHIT.