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T: Fachverband Teilchenphysik

T 97: Experimental techniques in astroparticle physics IV

T 97.4: Vortrag

Donnerstag, 18. März 2021, 16:45–17:00, Tv

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

The accuracy of the cosmic ray energy reconstruction by the Fluorescence Detectors is the most crucial part of the hybrid detection method used at the Pierre Auger Observatory. Because of this the absolute calibration of the Fluorescence Telescopes is vitally important, since it determines the energy scale of the Observatory. The previous calibration method was carried out infrequently, due to its difficulty and high manpower requirements. To address this issue, a new XY-Scanner calibration system is being installed. It consists of a small isotropic light source, which is scanned across the front of the telescope and emits short light pulses at several known locations.

To calibrate the telescope with these light pulses, an exact measurement of the emitted intensity and angular profile of each pulse is needed. For this purpose a calibration test bench was designed, combining the measurements of a calibrated photo-diode and a photomultiplier tube. With the addition of precision rotation and translation stages it now also allows for angular profile measurements. An uncertainty of < 4% has been achieved with potential for further reductionsin the near future. The setup, operation and analysis of data takenfrom this bench are the main focus of this talk.

Supported by the BMBF Verbundforschung Astroteilchenphysik (Vorhaben 05A17PX1 und 05A20PX1).