K. Deiters et al., Properties of the most recent avalanche photodiodes for the CMS electromagnetic calorimeter, NUCL INST A, 442(1-3), 2000, pp. 193-197
Avalanche Photodiodes (APDs) with improved characteristics are being develo
ped by Hamamatsu Photonics for the electromagnetic calorimeter of the CMS e
xperiment. More than 30 prototypes have been made and investigated during t
he last 3 years in a development program, that showed significant progress.
The parameters of the most recent APDs including the long-term stability a
nd the effect of a high radiation level with a neutron fluence of 2 x 10(13
) n/cm(2) have been studied and are presented. (C) 2000 Elsevier Science B.
V. All rights reserved.