Hamburg 2016 – scientific programme

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T: Fachverband Teilchenphysik

T 105: Kosmische Strahlung V

T 105.6: Talk

Thursday, March 3, 2016, 18:00–18:15, VMP9 SR 29

Silicon Photomultipliers in AMIGA muon counters — •Ana Martina Botti for the Pierre-Auger collaboration — Institut für Kernphysik, Karlsruher Institut für Technologie — Instituto de Tecnologías en Detección y Astropartículas (ITeDA), Argentina.

The project AMIGA (Auger Muons and Infill for the Ground Array) aims to extend the energy range 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 is compounded by an infill of surface detectors (employing Cherenkov radiation detection in water) and muon counters. The AMIGA muon counters consist of an array of buried modules composed of 64 scintillator bars, a multi-pixel Photo Multiplier Tube (PMT) and the corresponding electronic of acquisition which works along with the surface detector.

Currently, ITeDA is evaluating the feasibility of replacing PMTs with silicon photomultipliers (SiPM) without performing any substantial modification in the digital readout nor in the mechanical design. I present calibration results of a prototype module associated to the surface detector Toune of the Pierre Auger Observatory using a SiPM Hamamatsu S1257-100C plugged to the standard AMIGA front-end electronics. In addition, a study concerning gain stability and temperature variation has also been performed and will be reported. I finally discuss a comparison between traces measured by both photo detectors (PMT and SiPM) for modules associated to the surface detector Toune.