Uniformisation of Lead Tungstate Crystals for the CMS Electromagnetic Calorimeter Endcaps

Britton, D. , Ryan, M., Qu, X. and Hafliger, P. (2004) Uniformisation of Lead Tungstate Crystals for the CMS Electromagnetic Calorimeter Endcaps. In: 8th International Conference on Advanced Technology and Particle Physics (ICATPP 2003): Astroparticle, Particle, Space Physics, Detectors and Medical Physics Applications, Villa Olmo, Como, Italy, 6-11 Oct 2003, ISBN 9789812388605 (doi:10.1142/9789812702708_0037)

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Abstract

Electromagnetic calorimeters based on dense, scintillating crystals have the potential to achieve extremely good energy resolution. However, care must be taken to minimise systematic effects such as variation of light collection efficiency with depth in the crystal. A HPMT has been used to accurately measure the non-uniformity of light collection in lead tungstate crystals for the CMS detector. It is found that the non-uniformity of crystals measured in the detector configuration is not much larger than the maximum tolerable limit. Shading the chamfered edges of the crystals with a pencil can reduce the non-uniformity by approximately 0.1%/X0. Roughening the chamfers achieves a similar reduction.

Item Type:Conference Proceedings
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Britton, Professor David
Authors: Britton, D., Ryan, M., Qu, X., and Hafliger, P.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:8th International Conference on Advanced Technology and Particle Physics (ICATPP 2003): Astroparticle, Particle, Space Physics, Detectors and Medical Physics Applications
ISBN:9789812388605
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