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C-Arapuca: A new device for Cherenkov radiation detection

2023pp. 389–389

A. C. Fauth, A.A. Machado, V. L. Pimentel, E. Segreto, Gabriel Botogoske, M. C. Q. Bazetto, Jorge Andres Molina Insfran, A. F. Steklain Lisbôa, M. R. Adames, Jorge Henrique de Andrade Pacheco Reis, Frederico Luciano Demolin, Heriques Frandini Gatti

Abstract

Many high-energy physic experiments use Cherenkov radiation as a detection method. Photomultiplier tubes are typically used to convert the radiation into an electrical signal. In this work, we present the development of a new device dedicated to the detection of Cherenkov radiation photons that could replace photomultiplier tubes in experiments that detect this radiation. C-Arapuca is the name given to this device, as it uses the concept of photon trapping in a box, already used in the Deep Underground Neutrino Experiment, but now adapted for the detection of a range of energies of Cherenkov radiation photons. Calculations of efficiency, design, and performance of the C-Arapuca are described, highlighting its performance compared to photomultiplier tube in the detection of Cherenkov radiation. A shortpass dichroic filter with a cut-off wavelength at 400 nm was used in the C-Arapuca window, and the inner part of the box, covered with highly reflective material, contains a blue-emitting wavelength-shifting plastic slab and Hamamatsu silicon photomultipliers. In this study, a cylindrical tank containing 550 liters of ultrapure water was used, in which two C-Arapucas and a photomultiplier tube with a photocathode of 110 mm in diameter were installed. The useful area of the optical window of a C-Arapuca is 70.0 x 93.0 mm². Relativistic muons from local cosmic radiation passing through the water volume were used as a source of Cherenkov radiation detected by both the C-Arapucas and the photomultiplier tube, allowing for a relative comparison of the performance of the new device.

Abstract

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