Radiation hardness qualification of PbWO<sub>4</sub>scintillation crystals for the CMS Electromagnetic Calorimeter

Group, The CMS Electromagnetic Calorimeter; Adžić, P.; Almeida, N.; Andelin, D.; Aničin, I.; Antunović, Ž.; Arcidiacono, R.; Arenton, M. W.; Auffray, E.; Argirò, S.; Askew, A.; Baccaro, S.; Baffioni, S.; Balazs, M.; Bandurin, D. V.; Barney, D.; Barone, L.; Bartoloni, Alessandro; Baty, C.; Beauceron, S.; Bell, K. W.; Bernet, C.; Besançon, M.; Betev, B. L.; Beuselinck, R.; Biino, C.; Blaha, J.; Bloch, P.; Borisevitch, A.; Bornheim, A.; Bourotte, J.; Brown, R. M.; Buehler, M.; Busson, P.; Camanzi, B.; Camporesi, T.; Cartiglia, N.; Cavallari, F.; Cecilia, A.; Chang, P.; Chang, Y. H.; Charlot, C.; Chen, E A; Chen, W T; Chen, Z; Chipaux, R.; Choudhary, B. C.; Choudhury, R. K.; Cockerill, D. J. A.; Conetti, S.; Cooper, S. I.; Cossutti, F.; Cox, B. E.; Cussans, D.; Dafinei, I.; Calafiori, D. R. Da Silva Di; Daskalakis, G.; David, A.; Deiters, K.; Déjardin, M.; Benedetti, A. De; Ricca, G. Della; Re, D. Del; Denegri, D.; Depasse, P.; Descamps, J.; Diemoz, M.; Marco, E. Di; Dissertori, G.; Dittmar, M.; Djambazov, L.; Djordjevic, M.; Dobrzyński, L.; Dolgopolov, A.; Drndarevic, S.; Drobychev, G.; Dutta, D.; Dželalija, M.; Elliott-Peisert, A.; Mamouni, H. El; Evangelou, I.; Fabbro, B.; Faure, J. L.; Fay, J.; Fedorov, A.; Ferri, F.; Franci, D.; Franzoni, G.; Freudenreich, K.; Funk, W.; Ganjour, S.; Gascon, S.; Gataullin, M.; Gentit, F. X.; Ghezzi, A.; Givernaud, A.; Gninenko, S.; Go, Alan S.; Gobbo, B.; Godinović, N.; Голубев, Н.; Govoni, P.; Grant, N.; Gras, P.; Haguenauer, M.; Alverson, G.; Hansen, M.; Haupt, J.; Heath, H. F.; Heltsley, B. K.; Hintz, W.; Hirosky, R.; Hobson, Peter R.; Honma, A.; Hou, George Wei-Shu; Hsiung, Y.; Huhtinen, M.; Ille, B.; Ingram, Q.; Inyakin, Alexandre A.V.; Jarry, P.; Jessop, C.; Jovanovic, D.; Kaadze, K.; Kachanov, V.A.; Kailas, S.; Kataria, S. K.; Kennedy, B. W.; Kokkas, P.; Kolberg, T.; Korjik, M.; Krasnikov, N.; Krpić, D.; Kubota, Yoshihiro; Kuo, C. M.; Kyberd, P.; Kyriakis, A.; Lebeau, M.; Lecomte, P.; Lecoq, P.; Ledovskoy, A.; Lethuillier, M.; Lin, S. W.; Lin, W.; Litvine, V.; Locci, E.; Longo, E.; Loukas, D.; Luckey, P. D.; Lustermann, W.; Ma, Y.; Malberti, M.; Malclès, J.; Maletić, D.; Manthos, N.; Maravin, Y.; Marchica, C.; Marinelli, N.; Μάρκου, Α.; Markou, C.; Marone, M.; Matveev, V.; Mavrommatis, C.; Meridiani, P.; Milenović, P.; Miné, P.; Missevitch, O.; Mohanty, A. K.; Moortgat, F.; Musella, P.; Musienko, Y.; Nardulli, A.; Nash, J.; Nédélec, P.; Negri, P.; Newman, H. B.; Nikitenko, A.; Nessi‐Tedaldi, F.; Obertino, M. M.; Organtini, G.; Orimoto, T.; Paganoni, M.; Paganini, P.; Palma, A.; Pant, L. M.; Papadakis, A.; Papadakis, I. E.; Papadopoulos, I.; Paramatti, R.; Parracho, P. G. Ferreira; Pastrone, N.; Patterson, J. R.; Pauß, F.; Peigneux, J.P.; Petrakou, E.; Phillips, D. G.; Piroué, P.; Ptochos, F.; Puljak, I.; Pullia, A.; Punz, T.; Puzović, J.; Ragazzi, S.; Rahatlou, S.; Rander, J.; Razis, P. A.; Redaelli, N.; Renker, D.; Reucroft, S.; Ribeiro, Pedro; Rogan, C.; Ronquest, M.; Rosowsky, A.; Rovelli, C.; Rumerio, P.; Rusack, R.; Rusakov, S. V.; Ryan, M. J.; Sala, L.; Salerno, R.; Schneegans, M.; Seez, C.; Sharp, Phillip A.; Shepherd-Themistocleous, C. H.; Shiu, J. G.; Shivpuri, R. K.; Shukla, P.; Siamitros, C.; Sillou, D.; Silva, J; Silva, P; Singovsky, A.; Sirois, Y.; Sirunyan, A. M.; Smith, V. J.; Stöckli, F.; Swain, J.; Fatis, T. Tabarelli de; Takahashi, Masashi; Tancini, V.; Teller, O.; Theofilatos, K.; Thiebaux, Ch; Timciuc, V.; Timlin, C.; Titov, Maksym; Topkar, A.; Triantis, F. A.; Troshin, S.; Tyurin, N.; Ueno, K.; Uzunian, A.; Varela, J.; Verrecchia, P.; Veverka, J.; Virdee, T.; Wang, M; Wardrope, D. R.; Weber, Martin; Weng, J.; Williams, J. H.; Yang, Y.; Yaselli, I.; Yohay, R.; Zabi, A.; Zelepoukine, S.; Zhang, J; Zhang, L Y; Zhu, K.; Zhu, R.Y.

doi:10.1088/1748-0221/5/03/p03010

Cited by 17 publications

(11 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The expected hadron fluence varies between about 10 13 cm −2 in the barrel and 10 14 cm −2 at |η| = 3. The main observable effect of the radiation is a wavelength-dependent loss of crystal transparency but without changes to the scintillation mechanism [16]. A second effect of the radiation is that the VPT response decreases with accumulated photocathode charge to a plateau [17].…”

Section: The Cms Electromagnetic Calorimetermentioning

confidence: 99%

“…The ECAL response varies under irradiation due to the formation of colour centres that reduce the transparency of the lead tungstate. The crystal transparency recovers through spontaneous annealing [16]. A monitoring system, based on the injection of laser light at 440 nm, close to the emission peak of scintillation light from PbWO 4 , into each crystal, is used to track and correct for response changes during LHC operation [18,19].…”

Section: Ecal Operation and Stabilitymentioning

confidence: 99%

See 1 more Smart Citation

Energy calibration and resolution of the CMS electromagnetic calorimeter in pp collisions at √s= 7 TeV

Chatrchyan¹,

Khachatryan²,

Sirunyan³

et al. 2013

J. Inst.

171

155

View full text Add to dashboard Cite

The energy calibration and resolution of the electromagnetic calorimeter (ECAL) of the CMS detector have been determined using proton-proton collision data from LHC operation in 2010 and 2011 at a centre-of-mass energy of √ s = 7 TeV with integrated luminosities of about 5 fb −1 . Crucial aspects of detector operation, such as the environmental stability, alignment, and synchronization, are presented. The in-situ calibration procedures are discussed in detail and include the maintenance of the calibration in the challenging radiation environment inside the CMS detector. The energy resolution for electrons from Z-boson decays is better than 2% in the central region of the ECAL barrel (for pseudorapidity |η| < 0.8) and is 2-5% elsewhere. The derived energy resolution for photons from 125 GeV Higgs boson decays varies across the barrel from 1.1% to 2.6% and from 2.2% to 5% in the endcaps. The calibration of the absolute energy is determined from Z → e + e − decays to a precision of 0.4% in the barrel and 0.8% in the endcaps.

show abstract

Section: The Cms Electromagnetic Calorimetermentioning

confidence: 99%

Section: Ecal Operation and Stabilitymentioning

confidence: 99%

Energy calibration and resolution of the CMS electromagnetic calorimeter in pp collisions at √s= 7 TeV

Chatrchyan¹,

Khachatryan²,

Sirunyan³

et al. 2013

J. Inst.

171

155

View full text Add to dashboard Cite

show abstract

“…The SIC crystals were exposed to 30 Gy/h for 24 h at the Calliope source, Rome, and μ IND was measured directly following the irradiation. More details on the radiation damage and the procedure to measure μ IND can be found in [12]. Although the two methods are very different, the resulting absorption coefficients measured are in good agreement, as shown in Fig.…”

Section: Characteristic Variables Describing the Radiation Hardness Omentioning

confidence: 77%

Evolution Studies of the CMS Electromagnetic Calorimeter Endcap Signals

Weber

2015

Springer Theses

View full text Add to dashboard Cite

“…The expected integrated ionizing dose in the ECAL is up to 4 kGy in the barrel and 200 kGy at |η| = 3 after 10 years of LHC operation, while the expected hadron fluence varies between about 10 13 cm −2 in the barrel and 10 14 cm −2 at |η| = 3 [145]. The crystal response is subject to time-dependent changes in trasparency under this irradiation due to the formation of color centers, as well as lattice defects caused by hadronic interactions in the crystals [146]. In order to measure and correct for response changes during LHC operation, the ECAL is equipped with a light monitoring (LM) system [142,143].…”

Section: Ecal Laser Monitoringmentioning

confidence: 99%

“…The response drops during periods of LHC operation, and partially recovers during shutdown periods (or periods of low-luminosity data-taking). These observations correspond to changes in crystal transparency [146] and are used to correct the physics data. The response change observed in the ECAL channels is up to 6% in the barrel and it reaches up to 30% at |η| ∼ 2.5, the limit of the tracker acceptance.…”

Section: Ecal Laser Monitoringmentioning

confidence: 99%

Naturalness confronts nature: searches for supersymmetry with the CMS detector in pp collisions at √s = 8 and $13$ TeV

Duarte¹

2017

View full text Add to dashboard Cite

All rights reserved. I thank Maurizio Pierini for his intense mentorship beginning at CERN in 2011 and continuing to this day. Maurizio taught me how to be a modern particle physicist, by sharing his expertise in computing, statistics, and phenomenology. He was also invaluable in helping me prepare this manuscript. ABSTRACTIn this thesis, we present two inclusive searches for supersymmetric particles at √ s = 8 and 13 TeV using the razor variables and guided by the principle of naturalness. We build a framework to explore the natural supersymmetry parameter space of gluino and top squark masses and branching ratios, which is a unique attempt to cover this parameter space in a more complete way than ever before using LHC data. With this approach, the production of top squarks and gluinos are excluded below ∼ 700 GeV and ∼ 1.6 TeV, respectively, independent of the branching ratios, constituting one of the tightest constraints on natural supersymmetry from the LHC. Motivated by the need to mitigate the effects of multiple interactions per bunch crossing (pileup), an essential feature of present and future hadron colliders, in this thesis we also study the precision timing capabilities of a LYSO-based sampling calorimeter, and achieve a time resolution of ∼ 30 ps in electron test beam measurements. The achieved resolution corresponds to the precision needed to significantly reduce the inclusion of pileup particles in the reconstruction of the event of interest. This study is foundational in building an R&D program on precision timing for the high-luminosity LHC and other future hadron colliders. We also propose alternative simplified models to study Higgs-plus-jets events at the LHC, and reinterpret an excess observed at 8 TeV in the context of these models. Finally, we discuss a search for narrow resonances in the dijet mass spectrum at 13 TeV using the data-scouting technique at CMS, which records a smaller event format to increase the maximum recordable rate. For the benchmark models with a vector or axial-vector mediator that couples to quarks and dark matter particles, the dijet search excludes mediator masses from 0.5 TeV up to ∼ 2.7 TeV largely independent of the dark matter particle mass, which constitutes a larger exclusion than traditional mono-X searches at the LHC. In the plane of the dark matter-nucleon interaction cross section versus dark matter mass, the dijet search is also more sensitive than direct detection experiments for spin-dependent cross sections. J. M. G. D. performed the maximium-likelihood-fit-based background estimation and statistical interpretation using CMS data for this analysis and contributed to writing the manuscript for publication.[3] D. Anderson et al. "On timing properties of LYSO-based calorimeters".

show abstract

Radiation hardness qualification of PbWO₄scintillation crystals for the CMS Electromagnetic Calorimeter

Cited by 17 publications

References 46 publications

Energy calibration and resolution of the CMS electromagnetic calorimeter in pp collisions at √s= 7 TeV

Energy calibration and resolution of the CMS electromagnetic calorimeter in pp collisions at √s= 7 TeV

Evolution Studies of the CMS Electromagnetic Calorimeter Endcap Signals

Naturalness confronts nature: searches for supersymmetry with the CMS detector in pp collisions at √s = 8 and $13$ TeV

Contact Info

Product

Resources

About

Radiation hardness qualification of PbWO4scintillation crystals for the CMS Electromagnetic Calorimeter

Cited by 17 publications

References 46 publications

Energy calibration and resolution of the CMS electromagnetic calorimeter in pp collisions at √s= 7 TeV

Energy calibration and resolution of the CMS electromagnetic calorimeter in pp collisions at √s= 7 TeV

Evolution Studies of the CMS Electromagnetic Calorimeter Endcap Signals

Naturalness confronts nature: searches for supersymmetry with the CMS detector in pp collisions at √s = 8 and $13$ TeV

Contact Info

Product

Resources

About

Radiation hardness qualification of PbWO₄scintillation crystals for the CMS Electromagnetic Calorimeter