The trigger system of the Pierre Auger Surface Detector: operation, efficiency and stability
D.Allard, E. Armengaud, I. Allekotte, P. Allison, J. Aublin, M. Ave,, P. Bauleo, J. Beatty, T. Beau, X. Bertou, P. Billoir, C. Bonifazi, A. Chou,, J. Chye, S. Dagoret-Campagne, A. Dorofeev, P.L. Ghia, M. Gomez Berisso, A., Gorgi, J.C. Hamilton, J. Harton, R. Knapik, C. Lachaud
TL;DR
This paper details the Pierre Auger Observatory's Surface Detector trigger system, focusing on its operation, efficiency, and stability in identifying high-energy cosmic ray events amidst background noise.
Contribution
It introduces a comprehensive description of the trigger system, including methods for evaluating efficiency and demonstrating high-performance event selection.
Findings
High trigger efficiency for energies above 1 EeV
Effective rejection of random coincidences
Stable operation of the trigger system over time
Abstract
The trigger system of the Surface Detector (SD) of the Pierre Auger Observatory is described, from the identification of candidate showers ( EeV) at the level of a single station, among a huge background (mainly single muons), up to the selection of real events and the rejection of random coincidences at a higher central trigger level (including the reconstruction accuracy). Efficiency of a single station trigger is evaluated using real data , and the high performance of event selection hierarchy will be demonstrated.
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Taxonomy
TopicsAstrophysics and Cosmic Phenomena · Particle Detector Development and Performance · Particle physics theoretical and experimental studies