基于SCA的切伦科夫望远镜原型电子学的设计与测试

Design and Testing of Cherenkov Telescope Readout Electronics Prototype Based on Switched Capacitor Array

面向成像大气切伦科夫望远镜系统中使用硅光电倍增管(SiPM)探测器对宇宙线信号进行探测的需求,基于开关电容阵列(Switched Capacitor Array,SCA)波形数字化技术结合多增益处理技术,设计了相应的前端读出电子学系统原型,实现了在大动态范围内对SiPM探测器信号的读出,并根据信号的全波形信息完成了对信号的时间及电荷测量。本工作在介绍电子学系统原型设计方案和基本结构的基础上,对其进行了测试,检验了其各项性能指标。初步测试结果表明,该电子学系统原型在5~8000光电子(Photon Electron,P.E.)动态范围内的时间测量精度好于800 ns RMS;在5 P.E.处电荷测量精度好于30%;在8000 P.E.处电荷测量精度好于3%,均满足应用需求。

Aiming at the requirement for cosmic ray detection in Imaging Atmospheric Cherenkov Telescopes(IACT)using silicon photomultiplier(SiPM)detectors,a prototype of readout electronics is designed based on waveform digitization using the Switched Capacitor Array(SCA)ASIC.The prototype is able to read out SiPM detector signals with a wide dynamic range and then calculate the time and charge information of the input signal.The design scheme and structure of the readout electronics prototype are presented in this paper,and a series of tests are conducted to verify its performance.The preliminary results show that the time resolution of the readout system prototype is better than 800 ps RMS within the full dynamic range.The charge resolution is better than 30%at 5 P.E.and is better than 3%at 8000 P.E..The test results indicate that the readout system prototype meets the design requirements.