论文标题
使用ASIC Citiroc读出的峰值检测器模式来获得SIPM传感器的校准
Use of the Peak-Detector mode for gain calibration of SiPM sensors with ASIC CITIROC read-out
论文作者
论文摘要
The Cherenkov Imaging Telescope Integrated Read Out Chip (CITIROC) is a 32-channel fully analogue front-end ASIC dedicated to the read-out of silicon photo-multiplier (SiPM) sensors that can be used in a variety of experiments with different applications: nuclear physics, medical imaging, astrophysics, etc. It has been adopted as front-end for the focal plane detectors of the ASTRI-Horn Cherenkov望远镜，在这种情况下，已修改了实现峰值检测器读取模式以满足仪器要求的修改。对于每个通道，两个平行的AC耦合电压前置放大器，一个用于高增益，一个用于低增益，确保将电荷从160 fc到320 pc（即，从1到2000个带有SIPM增益的照相电子= 10 $^{6} $，具有照片的噪声比率为10）。两个前置放大器链中的每一个中的信号都是形状的，并通过激活可调时间间隔的峰值检测器来捕获最大值。在这项工作中，我们说明了峰值检测器操作模式，尤其是如何使用它来校准SIPM增益而无需外部光源。为了证明该方法的有效性，我们还提出并讨论了一些实验室测量。
The Cherenkov Imaging Telescope Integrated Read Out Chip (CITIROC) is a 32-channel fully analogue front-end ASIC dedicated to the read-out of silicon photo-multiplier (SiPM) sensors that can be used in a variety of experiments with different applications: nuclear physics, medical imaging, astrophysics, etc. It has been adopted as front-end for the focal plane detectors of the ASTRI-Horn Cherenkov telescope and, in this context, it was modified implementing the peak detector reading mode to satisfy the instrument requirements. For each channel, two parallel AC coupled voltage preamplifiers, one for the high gain and one for the low gain, ensure the read-out of the charge from 160 fC to 320 pC (i.e. from 1 to 2000 photo-electrons with SiPM gain = 10$^{6}$, with a photo-electron to noise ratio of 10). The signal in each of the two preamplifier chains is shaped and the maximum value is captured by activating the peak detector for an adjustable time interval. In this work, we illustrate the peak detector operation mode and, in particular, how this can be used to calibrate the SiPM gain without the need of external light sources. To demonstrate the validity of the method, we also present and discuss some laboratory measurements.
