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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