A ⁶ LiF:ZnS(Ag)-based cold neutron detector with wavelength shifting (WLS) fibers and Silicon photomultiplier (SiPM) photodetector was developed at the NIST Center for Neutron Research. For neutron scattering applications at the NCNR, detector false positives severely diminish the quality of very faint neutron scatter patterns. Thermal noise generated by the SiPM significantly increases the likelihood of false positives by the detector/discriminator. This article describes and evaluates a digital real-time algorithm implemented on a field programmable gate array (FPGA) which quickly differentiates SiPM thermal noise and noise pulse pile-up from neutron signals. The algorithm reduces deadtime spent on examining noise pulses as well as reduces the number of false positives.

中文翻译：

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用于减轻闪烁中子探测器中 SiPM 暗噪声效应的实时信号处理

甲⁶ 的LiF：硫化锌（AG）基与波长冷中子探测器移位（WLS）纤维和硅光电倍增器管（SiPM）探测器在NIST的中子研究中心开发的。对于 NCNR 的中子散射应用，探测器误报严重降低了非常微弱的中子散射模式的质量。SiPM 产生的热噪声显着增加了检测器/鉴别器误报的可能性。本文描述并评估了在现场可编程门阵列 (FPGA) 上实现的数字实时算法，该算法可快速区分 SiPM 热噪声和噪声脉冲堆积与中子信号。该算法减少了检查噪声脉冲所花费的死区时间，并减少了误报的数量。