Speaker
Description
Here we present an hodoscope setup developed in CBPF, Rio de Janeiro, to characterize water-Cherenkov detectors (WCDs). The setup was developed to aid the development of the Southern Wide-Field Gamma-ray Observatory (SWGO), an international collaboration that will build a major WCD-based array for gamma-ray astronomy in the Atacama Astronomical Park in Chile, at 4770 m a.s.l. The array will be used to detect, identify and reconstruct Extensive Air Showers (EASs) initiated by photons with energies from a few hundred GeV to the PeV scale. Our hodoscope will be used to evaluate different WCD design candidates and their performance, by analyzing their response to crossing EAS muons in function of their trajectory through the detector. The hodoscope has a bottom detector plane made of Resistive Plate Chambers, and a top detector plane made of Plastic Scintillator bars that is mounted over the tanks, allowing to accommodate tank designs with heights up to 3 m. A Geant4 framework has been developed to simulate the setup (WCD included) and provide insight for future measurements. Currently, the setup is testing a tank employing a multi-PMT design similar to the KM3NeT Digital Optical Modules, developed by the SWGO team at the University of Naples.
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