TY - JOUR
T1 - Radiation hard avalanche photodiodes for CMS ECAL
AU - Grahl, J.
AU - Kronquist, I.
AU - Rusack, R.
AU - Singovski, A.
AU - Kuznetsov, A.
AU - Musienko, Y.
AU - Reucroft, S.
AU - Swain, J.
AU - Deiters, K.
AU - Ingram, Q.
AU - Renker, D.
AU - Sakhelashvili, T.
N1 - Copyright:
Copyright 2007 Elsevier B.V., All rights reserved.
PY - 2003/5/21
Y1 - 2003/5/21
N2 - The photo detectors of the CMS electromagnetic calorimeter have to operate in a rather hostile environment, in a strong magnetic field of 4T and under unprecedented radiation levels. Avalanche Photo Diodes (APDs) have been chosen to detect the scintillation light of the 62,000 lead tungstate crystals in the barrel part of the calorimeter. After a 6 year long R&D work Hamamatsu Photonics produces APDs with a structure that is basically radiation hard. Only a few percent of the delivered APDs are weak due to defects at the surface caused by dust particles in the production process. 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 60Co irradiations and annealing under bias of all APDs and irradiations with hadrons on a sampling basis.
AB - The photo detectors of the CMS electromagnetic calorimeter have to operate in a rather hostile environment, in a strong magnetic field of 4T and under unprecedented radiation levels. Avalanche Photo Diodes (APDs) have been chosen to detect the scintillation light of the 62,000 lead tungstate crystals in the barrel part of the calorimeter. After a 6 year long R&D work Hamamatsu Photonics produces APDs with a structure that is basically radiation hard. Only a few percent of the delivered APDs are weak due to defects at the surface caused by dust particles in the production process. 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 60Co irradiations and annealing under bias of all APDs and irradiations with hadrons on a sampling basis.
KW - Avalanche photodiode
KW - Calorimeter
KW - Photo detector
KW - Radiation hardness
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U2 - 10.1016/S0168-9002(03)00748-4
DO - 10.1016/S0168-9002(03)00748-4
M3 - Conference article
AN - SCOPUS:0038182875
SN - 0168-9002
VL - 504
SP - 44
EP - 47
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
IS - 1-3
T2 - Proceedings of the 3rd International Conference on New Development
Y2 - 17 June 2002 through 21 June 2002
ER -