Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 594, Issue 2, Pages 292-320Publisher
ELSEVIER
DOI: 10.1016/j.nima.2008.01.104
Keywords
laser; monitoring system; optical transmittance; stability; calorimeter; scintillating crystal
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We report on the multiple wavelength laser monitoring system designed for the compact muon solenoid (CMS) lead tungstate crystal calorimeter. Results are presented for the test-beam performance of the system designed to achieve < 0.2% relative optical transmittance inter-calibration for 75 848 lead tungstate crystals. The system cycles continuously over the calorimeter to follow each crystal's evolution under the irradiation and recovery periods foreseen during operation at the LHC. (C) 2008 Elsevier B.V. All rights reserved.
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