X-Arapuca long term test

Authors :: Andreossi, V.
Balmforth, Z.
Machado, A. A. Bergamini
Botogoske, G.
Canci, N.
de Aguiar, R.
De Almeida, P. Duarte
Di Capua, F.
Fiorillo, G.
Grauso, G.
Matteucci, G.
Ravinthiran, S.
Segreto, E.
Suvorov, Y.
Publication Year :: 2023
Abstract: 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.