Dedicated SiPM array for GRD of GECAM
Dedicated SiPM array for GRD of GECAM
复制标题
GECAM GRD 专用 SiPM 阵列
DOI：
10.1007/s41605-021-00299-w
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发表时间：
2022
影响因子：
0.6
通讯作者：
W. X.
中科院分区：
文献类型：
--
作者：
Zhang;D. L.;Sun;X. L.;An;Z. H.;Li;X. Q.;Wen;X. Y.;Gong;K.;Cai;C.;Chang;Z.;Chen;G.;Chen;C.;Du;Y. Y.;Gao;M.;Gao;R.;Guo;D. Y.;He;J. J.;Hou;D. J.;Li;Y. G.;Li;C. Y.;Li;G.;Li;L.;Li;X. F.;Li;M. S.;Liang;X. H.;Liu;X. J.;Liu;Y. Q.;Lu;F. J.;Lu;H.;Meng;B.;Peng;W. X.
目的引力波和伽玛射线暴的发现预示着多信使天文学时代的到来。引力波高能电磁对应体全天监测仪（GECAM）采用两颗小卫星实现对伽玛暴的全天监测，具有准实时预警能力，在引力波源定位和后续观测中发挥重要作用。GECAM的每颗卫星装有25个3英寸直径的伽马射线探测器，覆盖能量范围为8-2兆电子伏。GRD采用硅光电倍增管（SiPM）代替光电倍增管（PMT），以适应微小卫星的尺寸限制。在该设计中，64个6 × 6 mm芯片以环形方式均匀排列，并在缝隙处填充反射膜，从而获得了令人满意的集光均匀性。SiPM阵列背面的集成前置放大电路采用了两级分组求和的方式，取得了满意的信噪比。结果性能研究表明，该SiPM阵列满足GECAM的要求。结论采用分组求和、反射膜、圆形排列、两组独立电源、高增益和低增益信号、差分信号输出技术等。该解决方案不仅可用于GECAM，还可作为基于SiPM的闪烁探测器的通用解决方案。
PurposeThe discovery of gravitational waves and gamma-ray bursts heralds the era of multi-messenger astronomy. With the adoption of two small satellites to achieve the all-sky monitoring of gamma-ray bursts, the gravitational wave high-energy electromagnetic counterpart all-sky monitor (GECAM) possesses a quasi-real-time early warning ability and plays an important role in positioning the sources of gravitational waves and in subsequent observations. Each satellite of GECAM was fitted with 25 3-inch-diameter gamma-ray detectors (GRD), covering an energy range of 8–2 MeV. GRDs have adopted silicon photomultiplier tubes (SiPM) in lieu of photomultiplier tubes (PMT) to adapt to the dimensional limitations of micro-satellites.MethodsA unique 3-inch circular SiPM array was designed. In this design, 64 6 × 6 mm chips were arranged evenly in a circular manner with the seams filled with reflecting films, thus achieving satisfactory uniformity of light collection. The integrated pre-amplifier circuit on the back of the SiPM array adopted two-level grouping and summing; further, it achieved a satisfactory signal-to-noise ratio. Two high-gain and low-gain channels were adopted to achieve a large dynamic range, and two independent power supply units were used, where each unit can be closed separately, thus improving reliability.ResultsPerformance studies show that this SiPM array meets the requirements of GECAM.ConclusionA 3-inch SiPM array have been developed that uses grouped summation, reflective films, a circular arrangement, two groups of independent power supplies, high- and low-gain signals, differential signal output technologies, etc. This solution can be used not only for GECAM, but also as a general solution for SiPM-based scintillation detectors.