The photon detection system of the DUNE experiment is based on the X-ARAPUCA light trap. The basic elements of the X-ARAPUCA are the dichroic filters coated with wavelength shifter (para-Therphenyl), a waveshifting plate and an array of SiPMs which detects the trapped photons. A small scale prototype of the X-ARAPUCA has been installed in liquid argon in a dedicated facility at INFN-Napoli and exposed to alpha particles from a source. In order to test the stability of the overall device response the X-ARAPUCA was kept for 10 days in liquid argon continuously purified. The performed tests allowed for a preliminary estimation of the X-ARAPUCA absolute photon detection efficiency.
Cite
@article{arxiv.2301.00420,
title = {X-Arapuca long term test},
author = {V. Andreossi and Z. Balmforth and A. A. Bergamini Machado and G. Botogoske and N. Canci and R. de Aguiar and P. Duarte De Almeida and F. Di Capua and G. Fiorillo and G. Grauso and G. Matteucci and S. Ravinthiran and E. Segreto and Y. Suvorov},
journal= {arXiv preprint arXiv:2301.00420},
year = {2023}
}