Calibration of the AMIGA ADC channel with T1 background events

A. M. BOTTI, ET AL.; M. PERLIN

Otro; Publicación interna Colaboración Pierre Auger; 2020

In this GAP note, background events of the AMIGA underground muon detectorare analyzed to obtain an online calibration of the ADC channels and to study theperformance of the underground muon detector in the field. As proof of concept,we extracted T1 events from the module with Id. 101 of the station with Id. 93.Since most of these T1 events are empty, we use the binary channel to identify whena particle is injected in the muon detector and we use its timing information tointegrate the charge in the ADC channel. We show that in these background eventsthere is signal accumulation within the T1 trigger scope, and by subtracting the noiseto these signals we can achieve a calibration histogram, from which the mean chargeof a single-muon can be extracted. Furthermore, we compare this calibration resultwith the result obtained from the offline calibration with shower events, and bothare proved to be compatible. Finally, we also demonstrate that the online calibrationis stable within the analyzed period of time (08-2018 to 02-2019) and robust underchanges in the counting strategy implemented to identify injected particles.