Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 97: Experimental techniques in astroparticle physics IV

T 97.5: Vortrag

Donnerstag, 18. März 2021, 17:00–17:15, Tv

Absolute energy calibration of the Fluorescence Detectors at the Pierre Auger Observatory with a roving laser system* — •Alina Nasr Esfahani for the Pierre Auger collaboration — Bergische Universität Wuppertal, Gaußstr. 20, Wuppertal, Germany

The Fluorescence Detector (FD) of the Pierre Auger Observatory provides a nearly model independent measurement of the energy of primary cosmic rays. This FD energy measurement is used to calibrate the energy reconstruction of the Surface Detector. The precision of the FD energy calibration therefore factors into the systematic uncertainties of practically all scientific results from the Observatory. A precise calibration can be achieved by firing a laser with known energy output in front of the FD telescopes. The advantage of such a method is that the camera response to the laser closely mimics its response to a real cosmic ray shower in a way which can not be duplicated by other calibration techniques. Thorough work has been put into the design of the system and its components. The important aspects of mean energy, wavelength and stability have been tested with simulations. Special care has also been given with regard to the de-polarization of the beam to ensure a reliable correlation between output energy and directional light yield. Additionally a telescope mount is used to steer the laser to allow for inclined shots. This talk will focus on the design requirements of a roving laser system and outline plans for measurement campaigns.

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