TY  - JOUR
AU  - Cabanelas, P. et al
AU  - Nacher, E.
PY  - 2020
DA  - 2020//
TI  - Performance recovery of long CsI(Tl) scintillator crystals with APD-based readout
T2  - Nucl. Instrum. Methods Phys. Res. A
JO  - Nuclear Instruments & Methods in Physics Research A
SP  - 163845
EP  - 6pp
VL  - 965
PB  - Elsevier
KW  - CsI(Tl) scintillator crystals
KW  - Energy resolution
KW  - Non-uniformity light output
KW  - Optical Coupling
KW  - Avalanche Photo-Diodes
AB  - 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.
SN  - 0168-9002
UR  - https://arxiv.org/abs/2003.01485
UR  - https://doi.org/10.1016/j.nima.2020.163845
DO  - 10.1016/j.nima.2020.163845
LA  - English
N1  - WOS:000524338400006
ID  - Cabanelas+Nacher2020
ER  -