用VERITAS分析Flash ADC数据
Analysis of Flash ADC Data With VERITAS
摘要：
VERITAS使用了一个12米的分段镜和像素化的光电倍增管照相机来探测由宇宙高能伽马射线引发的大范围空气簇射产生的切伦科夫辐射的短暂脉冲。VERITAS数据采集系统由一个每秒500兆采样的定制闪存ADC系统组成，该系统每2纳秒对切伦科夫光脉冲进行一次采样。每个闪存ADC通道中的积分电荷与入射到相应光电倍增管上的切伦科夫光量成比例。准确的能量估计和光谱重建需要精确的积分电荷的重建。在低强度下的积分电荷的可靠计算可以导致系统的能量阈值的降低和灵敏度的增加。本文研究和比较了几种评价综合装药的方法。闪存ADC读出中的切伦科夫脉冲定时信息有可能有助于背景抑制技术。各种方法提取的定时信息进行了研究，并取得了良好的定时分辨率。
英文摘要：
VERITAS employs a 12m segmented mirror and pixellated photomultiplier tube camera to detect the brief pulse of Cherenkov radiation produced by the extensive air shower initiated by a cosmic high-energy gamma ray. The VERITAS data acquisition system consists of a 500 Mega-Sample-Per-Second custom-built flash ADC system, which samples the Cherenkov light pulse every 2 nanoseconds. The integrated charge in each flash ADC channel is proportional to the amount of Cherenkov light incident on the corresponding photomultiplier tube. Accurate reconstruction of the integrated charge is required for accurate energy estimation and spectral reconstruction. A reliable calculation of the integrated charge at low intensities can lead to a reduction in the energy threshold of the system, and an increase in sensitivity. This paper investigates and compares several approaches for evaluating the integrated charge. The Cherenkov pulse timing information in the flash ADC readout has the potential to assist in background rejection techniques. Various methods for extracting the timing information are investigated and excellent timing resolution is achieved.
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