Development and validation of the signal simulation for the underground muon detector of the Pierre Auger Observatory

The underground muon detector of the Pierre Auger Observatory is aimed at attaining direct measurements of the muonic component of extensive air showers produced by cosmic rays with energy from 1016.5 eV up to the region of the ankle (around 1018.7 eV). It consists of two nested triangular grids of...

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Bibliographic Details
Published in:Journal of instrumentation 2021-07, Vol.16 (7), p.P07059
Main Authors: Botti, A.M., Sánchez, F., Roth, M., Etchegoyen, A.
Format: Article
Language:English
Subjects:
Arrays
Augers
Cosmic ray showers
Cosmic rays
Front-end electronics for detector readout
Muons
Observatories
Optical fibers
Performance of High Energy Physics Detectors
Photomultiplier tubes
Photon detectors for UV, visible and IR photons (solid-state) (PIN diodes, APDs, Si-PMTs, G-APDs, CCDs, EBCCDs, EMCCDs, CMOS imagers, etc)
Scintillation counters
Sensors
Simulation
Simulation methods and programs
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Summary:The underground muon detector of the Pierre Auger Observatory is aimed at attaining direct measurements of the muonic component of extensive air showers produced by cosmic rays with energy from 1016.5 eV up to the region of the ankle (around 1018.7 eV). It consists of two nested triangular grids of underground scintillators with 433 m and 750 m spacings, and a total of 71 positions, each with 192 scintillator strips (30 m2) deployed 2.3 m underground. The light produced by impinging muons in the scintillators is propagated with optical fibers towards an array of silicon photomultipliers. In this work, we present the development, validation, and performance of an end-to-end tool for simulating the response of the underground muon detector to single-muon signals, which constitutes the basis for further simulations of the whole array. Laboratory data and simulation outcomes are found consistent, showing that with the underground muon detector we can measure single muons, with an efficiency of 99%, up to about 1050 particles arriving at exactly the same time in 30 m2 of scintillator.
ISSN:1748-0221
1748-0221
DOI:10.1088/1748-0221/16/07/P07059