Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 540, Issue 2-3, Pages 273-284Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nima.2004.11.038
Keywords
CMS; calorimeter; lead tungstate; HPMT
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A technique has been developed to measure the light collection uniformity of lead tungstate crystals for the CMS electromagnetic calorimeter. The use of a hybrid photomultiplier tube allows a precision measurement despite the intrinsically low light yield. It is found that shading the chamifered edges of the crystals with a pencil can achieve a reduction in the front-non-unifortnity of approximately 0.1%/X-0. Similar effects are observed by de-polishing the chamfers. (c) 2004 Elsevier B.V. All rights reserved.
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