Cross-calibration of two automatic quality control systems for the CMS ECAL crystals

E. Auffray, E. Bouquerel, G. Chevenier, P. Lecoq, L. Perez-Prado, P. Sempere-Roldan, M. Schneegans, F. Cavallari, S. Costantini, I. Dafinei, M. Diemoz, E. Longo, P. Meridiani, G. Organtini, R. Paramatti, S. Baccaro, M. Montecchi

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The barrel part of the CMS electromagnetic calorimeter consists of about 75000 Lead Tungstate (PbWO4) crystals arranged in 36×4 modules which are assembled in two Regional Centres, in Rome and at CERN. Two automatic machines have been designed to check the crystal quality before assembly. The main crystal characteristics are compared to a set of specifications included in the contract with the crystal producers. The measurement stability and cross-calibration between the two machines is a fundamental issue, which has to be monitored throughout the construction phase. This paper describes comparisons between measurements made at the two regional centres to ensure a consistent and reliable crystal quality control. © 2004 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)355 - 364
Number of pages10
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number3
Publication statusPublished - 11 May 2004


All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation

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