%0 Journal Article
%T Performance recovery of long CsI(Tl) scintillator crystals with APD-based readout
%A Cabanelas, P. et al
%A Nacher, E.
%J Nuclear Instruments & Methods in Physics Research A
%D 2020
%V 965
%I Elsevier
%@ 0168-9002
%G English
%F Cabanelas+Nacher2020
%O WOS:000524338400006
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4363), last updated on Tue, 21 Apr 2020 10:08:39 +0000
%X CALIFA is the high efficiency and energy resolution calorimeter for the (RB)-B-3 experiment at FAIR, intended for detecting high energy light charged particles and gamma rays in scattering experiments, and is being commissioned during the Phase-0 experiments at FAIR, between 2018 and 2020. It surrounds the reaction target in a segmented configuration with 2432 detection units made of long CsI(Tl) finger-shaped scintillator crystals. CALIFA has a 10 year intended operational lifetime as the (RB)-B-3 calorimeter, necessitating measures to be taken to ensure enduring performance. In this paper we present a systematic study of two groups of 6 different detection units of the CALIFA detector after more than four years of operation. The energy resolution and light output yield are evaluated under different conditions. Tests cover the aging of the first detector units assembled and investigates recovery procedures for degraded detection units. A possible reason for the observed degradation is given, pointing to the crystal-APD coupling.
%K CsI(Tl) scintillator crystals
%K Energy resolution
%K Non-uniformity light output
%K Optical Coupling
%K Avalanche Photo-Diodes
%R 10.1016/j.nima.2020.163845
%U https://arxiv.org/abs/2003.01485
%U https://doi.org/10.1016/j.nima.2020.163845
%P 163845-6pp