Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 36: Methods in Astroparticle Physics II

T 36.6: Vortrag

Dienstag, 1. April 2025, 17:30–17:45, VG 3.101

Absolute energy calibration of the Fluorescence Telescopes at the Pierre Auger Observatory with a roving laser system^* — •Rukije Uzeiroska-Geyik for the Pierre-Auger collaboration — ergische Universität Wuppertal, Wuppertal, Germany

The Fluorescence Detector (FD) of the Pierre Auger Observatory provides energy measurements of primary cosmic rays that are largely independent of specific interaction models. The FD energy measurement is crucial for calibrating the energy reconstruction of the Surface Detector. Consequently, the accuracy of the FD energy calibration plays a significant role in the systematic uncertainties associated with nearly all scientific results of the Observatory. To achieve high accuracy in calibration, a laser with a well-defined energy output is going to be fired in front of the FD telescopes. This method has the advantage that the response of the telescope to the laser closely simulates its reaction to an actual cosmic ray air shower, something that is not achievable with other calibration methods.

The system was designed with special attention given to the depolarization of the laser beam to ensure a consistent relationship between energy output and directional light yield. This contribution covers the ongoing development of the mobile laser system and the calibration measurements performed in the laboratory to ensure the highest precision of the in field measurements.

*Supported by BMBF Verbundforschung Astroteilchenphysik (Vorhaben 05A23PX1)

Keywords: Fluorescence Light; Fluorescence Detector; Energy Calibration; Roving Laser System