荧光探测器的几何重构
Geometry reconstruction of fluorescence detectors revisited
摘要：
荧光观测实验技术用于目前和计划中的旨在了解超高能宇宙射线起源的空气簇射实验。在荧光技术中，簇射的几何形状是根据望远镜探测到的信号的视角和到达时间之间的相关性来重建的。将信号与不同淋浴器几何形状的预期信号进行比较，并确定最佳拟合几何形状。预期信号的计算通常基于由基本几何考虑激发的相对简单的函数。该函数基于光发射和通过大气传播过程的某些假设。例如，假设荧光以真空光速传播。我们调查这些假设的有效性，并提供可用于几何重建的校正。研究了其对重建参数的影响。这些结果也与混合观测有关，其中簇射同时由荧光和表面探测器记录。
英文摘要：
The experimental technique of fluorescence light observation is used in current and planned air shower experiments that aim at understanding the origin of ultra-high energy cosmic rays. In the fluorescence technique, the geometry of the shower is reconstructed based on the correlation between viewing angle and arrival time of the signals detected by the telescope. The signals are compared to those expected for different shower geometries and the best-fit geometry is determined. The calculation of the expected signals is usually based on a relatively simple function which is motivated by basic geometrical considerations. This function is based on certain assumptions on the processes of light emission and propagation through the atmosphere. For instance, the fluorescence light is assumed to propagate with vacuum speed of light. We investigate the validity of these assumptions and provide corrections that can be used in the geometry reconstruction. The impact on reconstruction parameters is studied. The results are also relevant for hybrid observations where the shower is registered simultaneously by fluorescence and surface detectors.
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