Efficiency studies for the prototype AMIGA detectors equipped with multi-anode PMTs

F. SÁNCHEZ; J. M. FIGUEIRA; A. M. BOTTI; B. GARCÍA; E. HOLT; D. MELO; M. PLATINO; F. SUAREZ; B. WUNDHEILER; A. ALMELA; A. ETCHEGOYEN; N. GONZÁLEZ; M. JOSEBACHUILI; M. CANZIANI; S. MÜLLER; B. ANDRADA; D. RAVIGNANI; A. FUSTER; A. TAPIA; M. R. HAMPEL; A. LUCERO; M. PERLIN; D. SCHMIDT; O. WAINBERG

Otro; Pierre Auger Internal GAP Note 051 (2016); 2016

Pierre Auger Internal GAP Note 051 (2016) /// The engineering array of AMIGA is equipped with detectors of 5 m2 and 10 m2 built with scintillator strips of 2 m and 4 m length respectively attached to a multi-anode photo-multiplier tube. These two hardware components, as well as the strategy applied to the 1-bit patterns to identify muonic signals, determine the reconstruction efficiency of the detectors. In this note, a thorough analysis of the differently sized scintillators? accuracies in counting muons is presented. The reconstruction efficiency is 95% (83%) for small (large) area modules using the counting strategy proposed thus far. The impact of modifying this standard reconstruction algorithm is also investigated. The novel procedure presented in this note allows small signals to be recovered and an efficiency of 93% is also achieved in the 10 m2 modules for events of low multiplicity. Nevertheless, as soon as more than 10 muons are simultaneously injected, both strategies perform identically. The study is based on laboratory measurements acquired with the same electronic kits installed in the prototype hexagon in the field.