Screening of Avalanche Photodiodes for the Cms Ecal

Details Screening of Avalanche Photodiodes for the Cms Ecal Screening of Avalanche Photodiodes for the Cms Ecal

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apsp.conf..169a&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

The Compact Muon Solenoid is one of two general purpose detectors currently being constructed for the Large Hadron Collider at CERN foreseen to begin data taking in 2007. Avalanche Photo Diodes (APDs) have been chosen to detect the scintillation light of the 61 200 lead tungstate crystals in the barrel part of the electromagnetic calorimeter of CMS. After a 8 years long R&D work Hamamatsu Photonics produces now APDs with a structure that is basically radiation resistant. Since a reliability of 99.9% is required, a method to detect weak APDs before they are built into the detector had to be developed. The described screening method is a combination of an irradiation with 60Co and annealing under bias of all APDs and on a sampling basis only an irradiation with hadrons.

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