论文标题
基于切换电容器阵列的校准和性能
Calibration and performance of the readout system based on switched capacitor arrays for the Large-Sized Telescope of the Cherenkov Telescope Array
论文作者
论文摘要
Cherenkov望远镜阵列（CTA）是下一代地面非常高的伽马射线天文台。 CTA的大型望远镜（LST）旨在检测20 GEV和几个带有23米直径镜的TEV之间的伽马射线。我们已经开发了第一个LST的焦平摄像头，该焦点摄像机具有1855个光电倍增管（PMTS）和读取系统，该系统采样了带有开关电容器阵列的GHz的PMT波形，Domino Ring Sampler Ver4（DRS4）。为了测量Cherenkov信号的精确脉冲电荷和到达时间，我们开发了一种校准DRS4和采样时间间隔的输出电压的方法，以及一种分析方法来纠正DRS4的尖峰噪声。自2018年第一届LST开幕以来，我们进行了调试测试并校准了相机。我们在夜空背景的各种条件下，每个像素的电荷分辨率，整个相机的充电均匀性以及带有测试脉冲和校准激光器的时间分辨率来表征相机的表征。
The Cherenkov Telescope Array (CTA) is the next-generation ground-based very-high-energy gamma-ray observatory. The Large-Sized Telescope (LST) of CTA is designed to detect gamma rays between 20 GeV and a few TeV with a 23-meter diameter mirror. We have developed the focal plane camera of the first LST, which has 1855 photomultiplier tubes (PMTs) and the readout system which samples a PMT waveform at GHz with switched capacitor arrays, Domino Ring Sampler ver4 (DRS4). To measure the precise pulse charge and arrival time of Cherenkov signals, we developed a method to calibrate the output voltage of DRS4 and the sampling time interval, as well as an analysis method to correct the spike noise of DRS4. Since the first LST was inaugurated in 2018, we have performed the commissioning tests and calibrated the camera. We characterised the camera in terms of the charge pedestal under various conditions of the night sky background, the charge resolution of each pixel, the charge uniformity of the whole camera, and the time resolutions with a test pulse and calibration laser.
