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Performance recovery of long CsI(Tl) scintillator crystals with APD-based readout

Cabanelas, P. ; González, D. ; Alvarez-Pol, H. ; Boillos, J. M. ; Casarejos, E. ; Cederkall, J. LU ; Cortina, D. ; Feijoo, M. ; Galaviz, D. and Galiana, E. , et al. (2020) In Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 965.
Abstract

CALIFA is the high efficiency and energy resolution calorimeter for the R3B 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 R3B 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... (More)

CALIFA is the high efficiency and energy resolution calorimeter for the R3B 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 R3B 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.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Avalanche Photo-Diodes, CsI(Tl) scintillator crystals, Energy resolution, Non-uniformity light output, Optical Coupling
in
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
volume
965
article number
163845
publisher
Elsevier
external identifiers
  • scopus:85082397312
ISSN
0168-9002
DOI
10.1016/j.nima.2020.163845
language
English
LU publication?
yes
id
0e723452-3643-4c9a-91d4-1a518bad3df3
date added to LUP
2020-04-02 13:26:56
date last changed
2020-04-07 05:45:01
@article{0e723452-3643-4c9a-91d4-1a518bad3df3,
  abstract     = {<p>CALIFA is the high efficiency and energy resolution calorimeter for the R<sup>3</sup>B 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 R<sup>3</sup>B 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.</p>},
  author       = {Cabanelas, P. and González, D. and Alvarez-Pol, H. and Boillos, J. M. and Casarejos, E. and Cederkall, J. and Cortina, D. and Feijoo, M. and Galaviz, D. and Galiana, E. and Gernhäuser, R. and Golubev, P. and Hartig, A. L. and Klenze, P. and Knyazev, A. and Kröll, T. and Nácher, E. and Park, J. and Perea, A. and Pietras, B. and Ponnath, L. and Rhee, H. B. and Rodríguez-Sánchez, J. L. and Suerder, C. and Tengblad, O. and Teubig, P.},
  issn         = {0168-9002},
  language     = {eng},
  publisher    = {Elsevier},
  series       = {Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment},
  title        = {Performance recovery of long CsI(Tl) scintillator crystals with APD-based readout},
  url          = {http://dx.doi.org/10.1016/j.nima.2020.163845},
  doi          = {10.1016/j.nima.2020.163845},
  volume       = {965},
  year         = {2020},
}