Large-area Si(Li) detectors for X-ray spectrometry and particle tracking in the GAPS experiment
Large-area Si(Li) detectors for X-ray spectrometry and particle tracking in the GAPS experiment
复制标题
DOI：
10.1088/1748-0221/14/10/p10009
复制
发表时间：
2019-10-01
影响因子：
1.3
通讯作者：
Shimizu, Y.
中科院分区：
文献类型：
--
作者：
Rogers, F.;Xiao, M.;Shimizu, Y.
第一个锂漂移硅（Si（Li））探测器，以满足独特的几何形状，性能和成本要求的通用反粒子谱仪（GAPS）的实验已经由岛津公司生产。GAPS Si（Li）探测器将形成第一个大面积、相对高温的Si（Li）探测器系统，对X射线敏感，可在高空运行。这些10厘米直径，2.5毫米厚，4或8条探测器提供的有效面积，X射线吸收效率，能量分辨率，和粒子跟踪能力所需的GAPS外来原子粒子识别技术。本文从X射线能量分辨和宇宙最小电离粒子（MIP）信号重建两个方面对探测器性能进行了验证。我们使用半导体探测器建立的噪声模型，以区分由于信号处理电子的检测器的噪声源。我们证明，无论是4条或8条探测器可以提供所需的小于或类似于4千电子伏（FWHM）的X射线能量分辨率在飞行温度为-35至-45摄氏度，给出了适当的选择信号处理电子。大约1000个8条探测器将用于计划于2021年底进行的首次GAPS南极气球飞行。
The first lithium-drifted silicon (Si(Li)) detectors to satisfy the unique geometric, performance, and cost requirements of the General Antiparticle Spectrometer (GAPS) experiment have been produced by Shimadzu Corporation. The GAPS Si(Li) detectors will form the first large-area, relatively high-temperature Si(Li) detector system with sensitivity to X-rays to operate at high altitude. These 10 cm-diameter, 2.5 mm-thick, 4- or 8-strip detectors provide the active area, X-ray absorption efficiency, energy resolution, and particle tracking capability necessary for the GAPS exotic-atom particle identification technique. In this paper, the detector performance is validated on the bases of X-ray energy resolution and reconstruction of cosmic minimum ionizing particle (MIP) signals. We use the established noise model for semiconductor detectors to distinguish sources of noise due to the detector from those due to signal processing electronics. We demonstrate that detectors with either 4 strips or 8 strips can provide the required less than or similar to 4 keV (FWHM) X-ray energy resolution at flight temperatures of -35 to -45 degrees C, given the proper choice of signal processing electronics. Approximately 1000 8-strip detectors will be used for the first GAPS Antarctic balloon flight, scheduled for late 2021.