Karlsruhe 2024 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 56: Methods in astroparticle physics 3

T 56.5: Vortrag

Mittwoch, 6. März 2024, 17:00–17:15, Geb. 20.30: 2.067

Absolute calibration of the light source for the end-to-end calibration of the Fluorescence Detector of the Pierre Auger Observatory — •Julian Rautenberg and Baobiao Yue for the Pierre-Auger collaboration — Bergische Universität Wuppertal, Wuppertal, Germany

The accurate reconstruction of the cosmic ray energy by the Fluorescence Detector (FD) is a most crucial part of the hybrid detection used at the Pierre Auger Observatory. Therefore, the absolute calibration of the FD is vitally important, since it determines the energy scale of the Observatory. However, the previous calibration method was difficult to carry out and required a lot of manpower. To address this issue, a new calibration system, the XY-Scanner, was designed and is currently operating. The system consists of a light source, which scans across the front of each FD telescope with frequent isotropic light pulses. To calibrate the FD with this source, precise measurements of the emitted intensity and the angular profile of the photons in each pulse are needed. A calibration bench was designed for this purpose, which includes measurements from a calibrated photo-diode and a PMT. With the addition of rotation and translation stages, the angular and distance-dependent profiles of the light source are also measured. The current uncertainty of the absolute source calibration is less than 4%. The focus of this contribution is on the setup, operation, and analysis of data on this bench.

*Gefördert durch die BMBF Verbundforschung Astroteilchenphysik (Vorhaben 05A23PX1)

Keywords: Pierre Auger Observatory; Cosmic ray; Fluorescence Telescope; Calibration bench; Precise photon source