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arXiv 2007.10919physics.ins-detastro-ph.IM
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用101.4 MeV质子研究SensL J系列硅光电倍增器的辐射损伤

Radiation Damage Study of SensL J-Series Silicon Photomultipliers Using 101.4 MeV Protons

Alexei Ulyanov, David Murphy, Joseph Mangan, Viyas Gupta, Wojciech Hajdas, Daithi de Faoite, Brian Shortt, Lorraine Hanlon, Sheila McBreen

摘要:

研究了J系列硅光电倍增器(SiPMs)的辐射损伤,并将其用于未来的星载闪烁探测器。几个SiPM样品暴露于101.4 MeV质子,1 MeV中子当量通量范围为1.27*10^8 n/cm^2至1.23*10^10 n/cm^2。辐照后,SiPM经历了暗电流和噪声的大幅增加,这可能会在功耗,热控制和低能量事件检测方面为长期运行的太空任务带来问题。用CeBr 3闪烁体晶体进行的测量表明,在暴露于1.23*10^10 n/cm^2和室温退火之后,单个6 mm方形SiPM在室温下的暗噪声从0.1 keV增加到2 keV。由于大的SiPM噪声,对于使用4-SiPM阵列的CeBr 3探测器,伽马射线探测阈值增加到约20 keV,对于使用16-SiPM阵列的探测器,伽马射线探测阈值增加到约40 keV。仅观察到质子照射对平均探测器信号的小的影响,这表明SiPM增益和光子探测效率没有变化或变化很小。

英文摘要:

Radiation damage of J-series silicon photomultipliers (SiPMs) has been studied in the context of using these photodetectors in future space-borne scintillation detectors. Several SiPM samples were exposed to 101.4 MeV protons, with 1 MeV neutron equivalent fluence ranging from 1.27*10^8 n/cm^2 to 1.23*10^10 n/cm^2 . After the irradiation, the SiPMs experienced a large increase in the dark current and noise, which may pose problems for long-running space missions in terms of power consumption, thermal control and detection of low-energy events. Measurements performed with a CeBr3 scintillator crystal showed that after exposure to 1.23*10^10 n/cm^2 and following room-temperature annealing, the dark noise of a single 6 mm square SiPM at room temperature increased from 0.1 keV to 2 keV. Because of the large SiPM noise, the gamma-ray detection threshold increased to approximately 20 keV for a CeBr3 detector using a 4-SiPM array and 40 keV for a detector using a 16-SiPM array. Only a small effect of the proton irradiation on the average detector signal was observed, suggesting no or little change to the SiPM gain and photon detection efficiency.

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