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Simulations of light collection in long tapered CsI(Tl) scintillators using real crystal surface data and comparisons to measurement

Knyazev, A. LU ; Park, J. LU ; Golubev, P. LU ; Cederkäll, J. LU ; Alvarez-Pol, H. ; Benlliure, J. ; Cabanelas, P. ; Casarejos, E. ; Causeret, L. and Cortina-Gil, D. , et al. (2021) In Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment 1003.
Abstract
Simulation results for light transport in long tapered CsI(Tl) crystals using look-up tables (LUTs) are presented. The LUTs were derived from the topography of a polished and a lapped surface of a CsI(Tl) crystal measured with atomic force microscopy. Simulations with different combinations of polished and lapped surfaces were performed, to extract the non-uniformity of light collection depending on the interaction point, and compared to experimental results. The simulations reproduce the general trend given by the measurements, and show that more homogeneous light collection is attained when all lateral sides of the crystal are lapped. For the lapped crystal the simulation model is most sensitive to the reflectivity of the enhanced... (More)
Simulation results for light transport in long tapered CsI(Tl) crystals using look-up tables (LUTs) are presented. The LUTs were derived from the topography of a polished and a lapped surface of a CsI(Tl) crystal measured with atomic force microscopy. Simulations with different combinations of polished and lapped surfaces were performed, to extract the non-uniformity of light collection depending on the interaction point, and compared to experimental results. The simulations reproduce the general trend given by the measurements, and show that more homogeneous light collection is attained when all lateral sides of the crystal are lapped. For the lapped crystal the simulation model is most sensitive to the reflectivity of the enhanced specular reflector (ESR) foil surrounding the crystal, which is one of several properties influencing the light transport examined in this study. The sensitivity of the light-output non-uniformity to variations in the absorption length observed in a batch of CsI(Tl) crystals in a previous study is also discussed. Residual differences between the simulation and the measurements can potentially be attributed to the scattering of scintillation photons inside the materials used. Additional measurements to further advance the construction of the simulation model are suggested. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Calorimeters, Scintillators, Absorption length, Surface topography, Simulation of light transport
in
Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
volume
1003
article number
165302
pages
10 pages
publisher
Elsevier
external identifiers
  • scopus:85103973727
ISSN
0168-9002
DOI
10.1016/j.nima.2021.165302
language
English
LU publication?
yes
id
a0c6cb8a-d9b4-4530-a864-19d1b17702cd
date added to LUP
2021-04-12 10:40:15
date last changed
2021-04-21 08:15:08
@article{a0c6cb8a-d9b4-4530-a864-19d1b17702cd,
  abstract     = {Simulation results for light transport in long tapered CsI(Tl) crystals using look-up tables (LUTs) are presented. The LUTs were derived from the topography of a polished and a lapped surface of a CsI(Tl) crystal measured with atomic force microscopy. Simulations with different combinations of polished and lapped surfaces were performed, to extract the non-uniformity of light collection depending on the interaction point, and compared to experimental results. The simulations reproduce the general trend given by the measurements, and show that more homogeneous light collection is attained when all lateral sides of the crystal are lapped. For the lapped crystal the simulation model is most sensitive to the reflectivity of the enhanced specular reflector (ESR) foil surrounding the crystal, which is one of several properties influencing the light transport examined in this study. The sensitivity of the light-output non-uniformity to variations in the absorption length observed in a batch of CsI(Tl) crystals in a previous study is also discussed. Residual differences between the simulation and the measurements can potentially be attributed to the scattering of scintillation photons inside the materials used. Additional measurements to further advance the construction of the simulation model are suggested.},
  author       = {Knyazev, A. and Park, J. and Golubev, P. and Cederkäll, J. and Alvarez-Pol, H. and Benlliure, J. and Cabanelas, P. and Casarejos, E. and Causeret, L. and Cortina-Gil, D. and Díaz Fernández, P. and Feijoo, M. and Galaviz, D. and Galiana, E. and Gernhäuser, R. and Gonzalez, D. and Hartig, A.-L. and Heinz, A. and Heiss, B. and Johansson, H.T. and Klenze, P. and Kröll, T. and Perea, A. and Ponnath, L. and Ren, Z. and Rhee, H.-B. and Rodríguez-Sánchez, J.L. and Rondeau, G. and Tengblad, O. and Scheblykin, I.G. and Teubig, P. and Timm, R.},
  issn         = {0168-9002},
  language     = {eng},
  month        = {04},
  publisher    = {Elsevier},
  series       = {Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment},
  title        = {Simulations of light collection in long tapered CsI(Tl) scintillators using real crystal surface data and comparisons to measurement},
  url          = {http://dx.doi.org/10.1016/j.nima.2021.165302},
  doi          = {10.1016/j.nima.2021.165302},
  volume       = {1003},
  year         = {2021},
}