Lu2(1-x)Y2xSiO5 (LYSO) crystals readout by a silicon photomultiplier (SiPM) will be used in the barrel timing layer of a precision timing detector for the Compact Muon Solenoid (CMS) experiment at the High-Luminosity Large Hadron Collider (HL-LHC). This detector is expected to be exposed up to 5-Mrad γ-ray dose, 2.5×1013 charged hadrons/cm2, and 3×1014 neq/cm2 at the HL-LHC for 10 years of operation. We present results of the photocurrent in LYSO+SiPM packages induced by Co- 60 γ-rays and Cf-252 neutrons of the expected dose rate and neutron flux, respectively. The γ-ray-induced readout noise is about 30 keV, which is negligible when compared to the 4.2-MeV signal from the minimum ionization particle signals. The neutron-induced readout noise is about 7 keV, which is more than a factor of 4 smaller than that from the γ-rays.

中文翻译：

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LYSO+SiPM 封装中的伽马射线和中子感应光电流和读出噪声


由硅光电倍增管 (SiPM) 读出的 Lu2(1-x)Y2xSiO5 (LYSO) 晶体将用于高亮度大型强子对撞机的紧凑型 Mu 子螺线管 (CMS) 实验的精密定时探测器的桶定时层 ( HL-LHC）。该探测器预计将在 HL-LHC 上暴露高达 5-Mrad γ 射线剂量、2.5×1013 带电强子/cm2 和 3×1014 neq/cm2 的运行 10 年。我们展示了 LYSO+SiPM 封装中分别由预期剂量率和中子通量的 Co-60 γ 射线和 Cf-252 中子诱导的光电流结果。 γ 射线引起的读出噪声约为 30 keV，与最小电离粒子信号的 4.2 MeV 信号相比，可以忽略不计。中子引起的读出噪声约为 7 keV，比 γ 射线引起的读出噪声小 4 倍多。