TY  - JOUR
AU  - Adams, Todd
AU  - Adžić, Petar
AU  - Đorđević, Miloš
AU  - Jovanović, Dragana J.
AU  - Milošević, Jovan
AU  - Smiljković, Nikola
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1069
AB  - The performance of electromagnetic calorimeter modules made of proton-irradiated PbWO4 crystals has been studied in beam tests. The modules, similar to those used in the Endcaps of the CMS electromagnetic calorimeter (ECAL), were formed from 5x5 matrices of PbWO4 crystals, which had previously been exposed to 24 GeV protons up to integrated fluences between 2.1 x 10(13) and 1.3 x 10(14) cm(-2). These correspond to the predicted charged-hadron fluences in the ECAL Endcaps at pseudorapidity eta = 2.6 after about 500 fb(-1) and 3000 fb(-1) respectively, corresponding to the end of the LHC and High Luminosity LHC operation periods. The irradiated crystals have a lower light transmission for wavelengths corresponding to the scintillation light, and a correspondingly reduced light output. A comparison with four crystals irradiated in situ in CMS showed no significant rate dependence of hadron-induced damage. A degradation of the energy resolution and a non-linear response to electron showers are observed in damaged crystals. Direct measurements of the light output from the crystals show the amplitude decreasing and pulse becoming faster as the fluence increases. The latter is interpreted, through comparison with simulation, as a side-effect of the degradation in light transmission. The experimental results obtained can be used to estimate the long term performance of the CMS ECAL.
T2  - Journal of Instrumentation
T1  - Beam test evaluation of electromagnetic calorimeter modules made from proton-damaged PbWO4 crystals
VL  - 11
DO  - 10.1088/1748-0221/11/04/P04012
ER  - 

@article{
author = "Adams, Todd and Adžić, Petar and Đorđević, Miloš and Jovanović, Dragana J. and Milošević, Jovan and Smiljković, Nikola",
year = "2016",
abstract = "The performance of electromagnetic calorimeter modules made of proton-irradiated PbWO4 crystals has been studied in beam tests. The modules, similar to those used in the Endcaps of the CMS electromagnetic calorimeter (ECAL), were formed from 5x5 matrices of PbWO4 crystals, which had previously been exposed to 24 GeV protons up to integrated fluences between 2.1 x 10(13) and 1.3 x 10(14) cm(-2). These correspond to the predicted charged-hadron fluences in the ECAL Endcaps at pseudorapidity eta = 2.6 after about 500 fb(-1) and 3000 fb(-1) respectively, corresponding to the end of the LHC and High Luminosity LHC operation periods. The irradiated crystals have a lower light transmission for wavelengths corresponding to the scintillation light, and a correspondingly reduced light output. A comparison with four crystals irradiated in situ in CMS showed no significant rate dependence of hadron-induced damage. A degradation of the energy resolution and a non-linear response to electron showers are observed in damaged crystals. Direct measurements of the light output from the crystals show the amplitude decreasing and pulse becoming faster as the fluence increases. The latter is interpreted, through comparison with simulation, as a side-effect of the degradation in light transmission. The experimental results obtained can be used to estimate the long term performance of the CMS ECAL.",
journal = "Journal of Instrumentation",
title = "Beam test evaluation of electromagnetic calorimeter modules made from proton-damaged PbWO4 crystals",
volume = "11",
doi = "10.1088/1748-0221/11/04/P04012"
}

Adams, T., Adžić, P., Đorđević, M., Jovanović, D. J., Milošević, J.,& Smiljković, N.. (2016). Beam test evaluation of electromagnetic calorimeter modules made from proton-damaged PbWO4 crystals. in Journal of Instrumentation, 11.
https://doi.org/10.1088/1748-0221/11/04/P04012

Adams T, Adžić P, Đorđević M, Jovanović DJ, Milošević J, Smiljković N. Beam test evaluation of electromagnetic calorimeter modules made from proton-damaged PbWO4 crystals. in Journal of Instrumentation. 2016;11.
doi:10.1088/1748-0221/11/04/P04012 .

Adams, Todd, Adžić, Petar, Đorđević, Miloš, Jovanović, Dragana J., Milošević, Jovan, Smiljković, Nikola, "Beam test evaluation of electromagnetic calorimeter modules made from proton-damaged PbWO4 crystals" in Journal of Instrumentation, 11 (2016),
https://doi.org/10.1088/1748-0221/11/04/P04012 . .