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T: Fachverband Teilchenphysik

T 61: Methods of astroparticle physics IV

T 61.3: Vortrag

Mittwoch, 1. April 2020, 17:00–17:15, L-3.001

Absolute calibration of the light source for the end-to-end calibration of the Fluorescence Detector of the Pierre Auger Observatory — •Tobias Heibges for the Pierre Auger collaboration — Bergische Universität Wuppertal, Gaußstraße 20 42119, Wuppertal, Deutschland

One of the crucial parts of the hybrid detection method used at the Pierre Auger Observatory is the absolute calibration of the fluorescence telescopes. Since it determines the energy range of the Observatory, high accuracy is required. The previous calibration method was carried out infrequently, due to its difficulty and high demand of manpower. To address this, the new XY-Scanner calibration system has been developed. It consists of a small lambertian light source, which is scanned spatially across the front of the telescope and emits short light pulses at several known locations.

To calibrate the telescope based on these light pulses an exact measurement of the number of photons emitted in each pulse is needed. For this purpose, a calibration test bench was designed, which combines the measurements of a calibrated photodiode and a PMT was designed. The setup and operation of this bench will be the main subject of this talk. Using it, an uncertainty of less than 4% could be achieved with potential for further reductions in the near future.

* Gefördert durch die BMBF Verbundforschung Astroteilchenphysik (Vorhaben 05A17PX1).