Performance of ACCOS, an automatic crystal quality control system for the PWO crystals of the CMS calorimeter

Authors
Auffray, E Chevenier, G Freire, M Lecoq, P Le Goff, JM Marcos, R Drobychev, G Missevitch, O Oskine, A Zouevsky, R Peigneux, JP Schneegans, M
Citation
E. Auffray et al., Performance of ACCOS, an automatic crystal quality control system for the PWO crystals of the CMS calorimeter, NUCL INST A, 456(3), 2001, pp. 325-341
Citations number
9
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement
Journal title
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
ISSN journal
01689002 → ACNP
Volume
456
Issue
3
Year of publication
2001
Pages
325 - 341
Database
ISI
SICI code
0168-9002(20010101)456:3<325:POAAAC>2.0.ZU;2-D
Abstract
Nearly 80 000 PWO crystals for the CMS electromagnetic calorimeter will arr ive at CERN/Geneva and INFN-ENEA/Rome between now and year 2004. The string ent specifications on their dimensions and optical quality have to be verif ied prior to their formal acceptation. Automatic systems for measuring the critical parameters of each crystal and recording them in a database have b een designed and constructed. The first machine is now in stable operation at CERN. In this note, the performance of each instrument, based on the mea surements on similar to 1000 pre-production crystals, is analysed in terms of stability and compared to the results of conventional benches. (C) 2001 Elsevier Science B.V. All rights reserved.