Light collection uniformity of lead tungstate crystals for the CMS electromagnetic calorimeter

Britton, D. , Ryan, M. and Qu, X. (2005) Light collection uniformity of lead tungstate crystals for the CMS electromagnetic calorimeter. Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment, 540(2-3), pp. 273-284. (doi:10.1016/j.nima.2004.11.038)

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Abstract

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 chamfered edges of the crystals with a pencil can achieve a reduction in the front-non-uniformity of approximately 0.1%/X<sub>0</sub>. Similar effects are observed by de-polishing the chamfers.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Britton, Professor David
Authors: Britton, D., Ryan, M., and Qu, X.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Nuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
ISSN:0168-9002
Published Online:31 December 2004

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