CERN Accelerating science

CMS Note
Report number	CMS-NOTE-1997-030
Title	APD Properties and Recovery from Radiation Damage
Author(s)	Baccaro, Stefania (INFN - Sezione di Roma, INFN - Sezione di Roma, ENEA-INN/TEC Casaccia Research Center, Roma, Italy) ; Borgia, Bruno (INFN - Sezione di Roma, Department of Physics, Universita 'La Sapienza', Roma, Italy) ; Caruso, S (INFN - Sezione di Roma, INFN - Sezione di Roma, ENEA-INN/TEC Casaccia Research Center, Roma, Italy) ; Cavallari, Francesca (INFN - Sezione di Roma, Department of Physics, Universita 'La Sapienza', Roma, Italy) ; Dafinei, Ioan (INFN - Sezione di Roma, Department of Physics, Universita 'La Sapienza', Roma, Italy) ; Diemoz, Marcella (INFN - Sezione di Roma, Department of Physics, Universita 'La Sapienza', Roma, Italy) ; Emeliantchik, Igor (Bielorussian State Univerisity, Minsk, Bielorussia) ; Festinesi, Armando (INFN - Sezione di Roma, Department of Physics, Universita 'La Sapienza', Roma, Italy) ; Longo, Egidio (INFN - Sezione di Roma, Department of Physics, Universita 'La Sapienza', Roma, Italy) ; Montecchi, Marco (INFN - Sezione di Roma, INFN - Sezione di Roma, ENEA-INN/TEC Casaccia Research Center, Roma, Italy) ; Organtini, Giovanni (Department of physics, Universita 'Roma-TRE', Roma, Italy) ; Rosi, G (INFN - Sezione di Roma, INFN - Sezione di Roma, ENEA-INN/TEC Casaccia Research Center, Roma, Italy)
Submitted by	5 May 1997
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; CMS
Free keywords	ECAL ; ELECTRONICS
Abstract	Avalanche photodiodes will be used to detect scintillation light from PWO crystals in the CMS electromagnetic calorimeter. Properties of Hamamatsu APD are reported special attention has been devoted to the study of radiation hardness and room temperature annealing. We found a fast recovery with a time constant of 1.3 days a medium fast recovery with a lifetime of the order of 10 days and indication of a third component with very long time constant of the order of 300 days.
Copyright/License	Preprint: (License: CC-BY-4.0)

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