用于中子位置灵敏探测器的SiPM性能研究

Study on the Performance of SiPM for the Neutron Position Sensitive Detector

为满足中国散裂中子源(China Spallation Neutron Source,CSNS)工程材料衍射谱仪的探测器需求,CSNS探测器组设计并研制了基于硅光电倍增管(Silicon Photomultiplier,SiPM)读出的闪烁体探测器。本工作针对该探测器,选取了Sensl MicroFJ-30035-TSV和Hamamatsu S13363-3050NE-16两种型号的SiPM,开展了其击穿电压、增益、温度特性、暗计数率等关键性能的测试。测试结果显示,两者单光子分辨能力,增益、暗计数率等性能均可满足当前闪烁体探测器需求,相同过偏压下,前者增益高于后者,且Hamamatsu SiPM增益对温度更敏感。测试了两SiPM的温度补偿系数分别为22.0 mV/ºC(Sensl)和53.6 mV/℃(Hamamatsu),为后续SiPM温度补偿电路设计奠定了基础。利用研制的探测器工程样机,在CSNS BL09下测试了两种SiPM读出的探测器对2.8Å中子探测效率分别为76%和68%,为目标探测器及同类型探测器的SiPM选型提供了参考。

In order to fulfill the requirements of the engineering material diffraction spectrometer of China Spallation Neutron Source(CSNS),a new integrated and modular scintillator detector based on Silicon Photomultiplier(SiPM)readout is designed and constructed by the Neutron Detector Group of the CSNS.In this paper,the characteristics such as breakdown voltage,gain,temperature characteristics and dark count rate of Sensl MicroFJ-30035-TSV and Hamamatsu S13363-3050NE-16 model SiPM are tested.The results show that the performance of the two SiPM including the single-photon resolution,gain,dark count rate can meet the requirements of the scintillator detector.The gain of Sensl SiPM is higher than that of Hamamatsu SiPM in the same overbias and the latter is more sensitive to temperature.The temperature compensation coefficient of the Sensl and Hamamatsu SiPM are 22.0 and 53.6 mV/℃ respectively,which will provide reference for the design of temperature compensation circuit of SiPM.The prototype of a scintillator detector based on the above two SiPM readout was developed and the detection efficiency of the detector has been tested on the BL09 of CSNS.The results show that the detection efficiency of detector equipped with Sensl SiPM or Hamamatsu SiPM is 76%and 68%for 2.8Åneutrons,respectively.The results of this paper will provide reference for the selection of SiPM for the developed scintillator detector and other SiPM-based detectors.