Münster 2017 – scientific programme

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T: Fachverband Teilchenphysik

T 16: Kosmische Strahlung 2

T 16.7: Talk

Monday, March 27, 2017, 18:20–18:35, H 4

Calibration of the AMIGA integrator at the Pierre Auger Observatory — •Ana Martina Botti for the Pierre Auger collaboration — Institut für Kernphysik, Karlsruher Institut für Technologie — Instituto de Tecnologías en Detección y Astropartículas (ITeDA), Buenos Aires, Argentina

The Auger Muons and Infill for the Ground Array (AMIGA) upgrade aims to extend the range of detection at the Pierre Auger Observatory, to observe cosmic rays of lower energies (down to ≤ 10¹⁷ eV) and to study the transition from extragalactic to galactic cosmic rays. AMIGA consists of an infill of surface detectors (Cherenkov radiation detection in water) and muon counters. The AMIGA muon counters are composed of an array of buried modules of 64 scintillator bars, optic fibres and a photo-detector: formerly a multi-pixel Photo Multiplier Tube (PMT) and currently an array of 64 silicon photomultipliers (SiPM). The corresponding electronic of acquisition works in tandem with the surface detector.

Currently, the transition from PMTs to SiPMs is taking place. The new SiPM electronics allows the module to work not only as a counter, but also as an integrator. The counter allows direct counting of muons as they reach the detector. On the other hand, the integrator estimates the number of muons by dividing the total charge of the signals by the average charge of a muon. In this talk, a calibration method for the AMIGA integrator, using the muon counter, will be presented. In addition, first results with data in the field will also be shown. Finally, a first approach to the integrator simulations will also be presented.