A low-energy sensitive compact gamma-ray detector based on LaBr3 and SiPM for GECAM
A low-energy sensitive compact gamma-ray detector based on LaBr3 and SiPM for GECAM
复制标题
用于 GECAM 的基于 LaBr3 和 SiPM 的低能敏感紧凑型伽马射线探测器
DOI：
10.1088/1748-0221/13/08/p08014
复制
发表时间：
2018-08-01
影响因子：
1.3
通讯作者：
Li, Y. G.
中科院分区：
文献类型：
--
作者：
Lv, P.;Xiong, S. L.;Li, Y. G.
引力波高能电磁对应物全天监测（GECAM）项目是中国计划用于探测X射线和伽马射线的太空望远镜。它由两颗近地轨道微型卫星组成，具有瞬时覆盖全天的优点。由于微型卫星尺寸、重量和功耗的限制，采用硅光电倍增管（SiPMs）代替光电倍增管（pmt）组装新型伽玛射线探测器。构建了LaBr3晶体SiPM阵列的原型并进行了测试，结果表明该阵列在5.9 keV下具有较高的检测效率（70%）和可接受的均匀性。通过单通道读出电路可以检测到5.9 keV的低能x射线，在5.9 keV时能量分辨率为125% (FWHM)，在662 keV时为6.5%，在1332 keV时为3.5%。本文讨论了该探测器的设计和性能。
The Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) project is the planned Chinese space telescope for detecting the X- and gamma-ray. It consists of two micro-satellites in low earth orbit with the advantages of instantaneous full-sky coverage. Due to the limitation of size, weight and power consumption of micro-satellites, silicon photomultipliers (SiPMs) are used to replace the photomultiplier tubes (PMTs) to assemble a novel gamma-ray detector. A prototype of a SiPM array with LaBr3 crystal is built and tested, and it shows a high detection efficiency (70% at 5.9 keV) and an acceptable uniformity. The low energy X-ray of 5.9 keV can be detected by single channel readout circuit, and the energy resolution are 125% (FWHM) at 5.9 keV, 6.5% at 662 keV and 3.5% at 1332 keV . The design and the performance of the detector are discussed in this paper.