Orateur
Description
The prototype array of the underground muon detector as part of the AMIGA enhancement was built and operated until November 2017. During this engineering phase, the array was composed of seven stations. The detector design as well as its performance for physics deliverables were validated and optimized. The most notable improvement was the selection of silicon photo-multipliers rather than photo-multiplier tubes as optical devices. It has been demonstrated that the detectors resemble the behavior of ideal poissonian counters. The counting efficiency for units of $10 \ \mathrm{m^2}$ was established to be $>98 \%$ for SiPM, and $83\%$ for PMT. The energy evolution of the muon densities measured with AMIGA shows a slope of $b = 0.90 \pm 0.04$, in accordance to the one expected for a constant composition. The full-sized underground muon detector array with 61 stations is foreseen to be completed by the end of 2019.
