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Multiple scattering measurement with laser events

机译：激光事件的多次散射测量

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The Pierre Auger Observatory Fluorescence Detector (FD) performs a calorimetric measurement of the primary energy of cosmic ray showers. The level of accuracy of this technique is determined by the uncertainty in several parameters, among them the fraction of shower light (both from fluorescence and Cherenkov light) that reaches the detector after being multiply scattered (MS) in the atmosphere. This component depends on atmospheric conditions, namely on Rayleigh and Mie scattering processes. Using laser events it is possible to study these processes and deconvolute them from the shower's electromagnetic lateral distribution. We propose a new method to measure the Rayleigh and Mie MS components seen in laser events, and correlate them with atmospheric conditions. In order to study in detail the effect of such conditions in the scattering of photons, a Geant4 dedicated laser simulation was developed. % In this framework photons are individually followed through the atmosphere allowing for any number of scatterings, from both processes This combination of a MS dedicated data analysis with a realistic laser simulation enables to explore MS characteristics, in particular the evolution with time, altitude and distance from the FD.
机译：Pierre Auger天文台荧光检测器（FD）对宇宙射线阵雨的一次能量进行量热测量。这项技术的准确性水平取决于几个参数的不确定性，其中包括淋浴光（来自荧光和切伦科夫光）在大气中被多次散射（MS）后到达检测器的比例。该成分取决于大气条件，即瑞利散射和米氏散射过程。利用激光事件，有可能研究这些过程并使它们从淋浴器的电磁横向分布中去卷积。我们提出了一种新的方法来测量在激光事件中看到的瑞利和米氏MS分量，并将它们与大气条件相关联。为了详细研究这种条件对光子散射的影响，开发了Geant4专用激光仿真器。 ％在此框架中，光子在整个过程中分别跟随大气，允许任意数量的散射。MS专用数据分析与逼真的激光模拟相结合，可以探索MS特性，尤其是随时间，高度和距离的变化从FD。

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