Uniformisation of Lead Tungstate Crystals for the Cms Electromagnetic Calorimeter Endcaps

Details Uniformisation of Lead Tungstate Crystals for the Cms Electromagnetic Calorimeter Endcaps Uniformisation of Lead Tungstate Crystals for the Cms Electromagnetic Calorimeter Endcaps

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apsp.conf..237b&link_type=abstract

ASTROPARTICLE, PARTICLE AND SPACE PHYSICS, DETECTORS AND MEDICAL PHYSICS APPLICATIONS. Proceedings of the 8th Conference. Held 6

Physics

Medical Physics

Scientific paper

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.

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