Performance of ACCOS, an Automatic Crystal quality Control System for the PWO crystals of the CMS calorimeter

Auffray, E.; Chevenier, G.; Freire, Marco; Lecoq, P.; Goff, J. M. Le; Marcos, Rodrigo Labat; Drobychev, G.; Missevitch, O.; Oskine, A. V.; Zouevsky, R; Peigneux, J.P.; Schneegans, M.

doi:10.1016/s0168-9002(00)00665-3

Cited by 29 publications

(17 citation statements)

References 2 publications

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“…Before irradiation the crystals were irradiated with γ-rays with an absorbed dose of 500Gy using a Co 60 source, and characterized by the CERN Accos machine [7] developed for the optical and geometrical characterization of the PWO crystals from CMS.…”

Section: Irradiation Conditions and Characterisationmentioning

confidence: 99%

Experimental Study of Lead Tungstate Scintillator Proton-Induced Damage and Recovery

Auffray

Korjik²,

Singovski

2012

IEEE Trans. Nucl. Sci.

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Lead tungstate (PbWO4, or PWO) scintillating crystals are used by two of the four experiments at the Large Hadron Collider (LHC): 75848 in CMS and 17920 in ALICE. For the CMS electromagnetic calorimeter, one of the most important crystal properties is its radiation hardness. With the increase of luminosity, the radiation level will increase drastically, particularly in the high pseudorapidity regions of the calorimeter. Beside the effects of color-centre formation caused by gamma-radiation, additional measurable effect originated by hadron irradiation could appear, which will further deteriorate the optical transmission of the crystals and therefore their efficiency. In this paper, we will present results of the proton-induced damage in PWO and a study of optical transmission recovery at different temperatures and under different light-induced "bleaching" conditions for proton-irradiated crystals. For the CMS electromagnetic calorimeter, one of the most important crystal properties is its radiation hardness. With the increase of luminosity, the radiation level will increase drastically, particularly in the high pseudorapidity regions of the calorimeter. Beside the effects of color-centre formation caused by γ-radiation, additional measurable effect originated by hadron irradiation could appear, which will further deteriorate the optical transmission of the crystals and therefore their efficiency. In this paper, we will present results of the proton-induced damage in PWO and a study of optical transmission recovery at different temperatures and under different light-induced "bleaching" conditions for proton-irradiated crystals.

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Section: Irradiation Conditions and Characterisationmentioning

confidence: 99%

Experimental Study of Lead Tungstate Scintillator Proton-Induced Damage and Recovery

Auffray

Korjik²,

Singovski

2012

IEEE Trans. Nucl. Sci.

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“…In both regional centers at CERN and at Rome an automatic machine (ACCOCe and ACCOR machines) was especially designed to check the specifications on each received crystal. A detailed description of their operation principles can be obtained from [13], [14]. Two CERN machines were also installed at BTCP and a Rome machine at SIC.…”

Section: Quality Controlmentioning

confidence: 99%

Overview of the 63000 PWO Barrel Crystals for CMS_ECAL Production

Auffray

2008

IEEE Trans. Nucl. Sci.

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“…Before the crystals are assembled into supermodules various parameters are checked using an automated quality control system [4]. One of the parameters that is checked is the crystal light yield and is measured using a Co 60 source and a photo-multiplier tube.…”

Section: Laboratory Measurementsmentioning

confidence: 99%

The CMS Electromagnetic Calorimeter

Ryan¹

2008

Astroparticle, Particle and Space Physics, Detectors and Medical Physics Applications

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The CMS experiment at the CERN Large Hadron Collider has placed great emphasis on precise calorimetry. The electromagnetic calorimeter (ECAL) contains 75000 scintillating lead tungstate crystals that are read out using sophisticated electronics; this paper describes these technologies and how they were implemented in the calorimeter. The results of pre-calibration measurements for the detector modules are detailed. Installation of the ECAL into the underground cavern has commenced and the commissioning process and its status are discussed. The experiment is scheduled to start in 2008 and prospects for the first year of operation and running are given.

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Performance of ACCOS, an Automatic Crystal quality Control System for the PWO crystals of the CMS calorimeter

Cited by 29 publications

References 2 publications

Experimental Study of Lead Tungstate Scintillator Proton-Induced Damage and Recovery

Experimental Study of Lead Tungstate Scintillator Proton-Induced Damage and Recovery

Overview of the 63000 PWO Barrel Crystals for CMS_ECAL Production

The CMS Electromagnetic Calorimeter

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