| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 9845686 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2005 | 12 Pages |
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%/X0. Similar effects are observed by de-polishing the chamfers.
Related Topics
Physical Sciences and Engineering
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Instrumentation
Authors
D. Britton, M. Ryan, X. Qu,