The Fluorescence detector Array of Single-pixel Telescopes (FAST) is a proposed low-cost, largearea, next-generation experiment for the detection of ultrahigh-energy cosmic rays (UHECRs) via the atmospheric fluorescence technique. Two FAST telescopes are currently installed and operating at the Black Rock Mesa site of the Telescope Array Experiment in Utah, USA. Knowledge of the properties of the atmosphere above the detector is of utmost importance for the analysis and reconstruction of the energy and trajectory of UHECRs measured with an atmospheric fluorescence telescope. The FAST experiment uses all sky camera (FASCam) and sky quality monitor (SQM) for the detection of clouds and quantification of the night-sky background light in the field-of-view of the telescopes. Measurements of a vertically-fired ultra-violet laser at a distance of 21 km from the FAST telescopes are used to infer the transparency of the atmosphere above the detector through comparison with simulations.
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机译：荧光探测器单像素望远镜阵列（FAST）是一种拟议的低成本，大面积下一代实验，用于通过大气荧光技术探测超高能宇宙射线（UHECR）。目前在美国犹他州的望远镜阵列实验的Black Rock Mesa站点上安装了两台FAST望远镜并正在运行。了解检测器上方大气的特性对于分析和重建用大气荧光望远镜测量的UHECR的能量和轨迹至关重要。 FAST实验使用全天候摄像机（FASCam）和天空质量监视器（SQM）来检测云和量化望远镜视野中的夜空背景光。与FAST望远镜相距21 km的垂直发射紫外激光的测量结果通过与模拟的比较来推断探测器上方大气的透明度。
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