Highly segmented large-area hybrid photodiodes with bialkali photocathodesand enclosed VLSI readout electronics

Citation
A. Braem et al., Highly segmented large-area hybrid photodiodes with bialkali photocathodesand enclosed VLSI readout electronics, NUCL INST A, 442(1-3), 2000, pp. 128-135
Citations number
10
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement
Journal title
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
ISSN journal
0168-9002 → ACNP
Volume
442
Issue
1-3
Year of publication
2000
Pages
128 - 135
Database
ISI
SICI code
0168-9002(20000311)442:1-3<128:HSLHPW>2.0.ZU;2-H
Abstract
We report on the principles, design, fabrication, and operation of a highly segmented, large-area hybrid photodiode, which is being developed in the f ramework of the LHCb RICH project. The device consists of a cylindrical, 12 7 mm diameter vacuum envelope capped with a spherical borosilicate UV-glass entrance window, with an active-to-total-area fraction of 81%, A fountain- focusing electron optics is used to demagnify the image onto a 50 mm diamet er silicon sensor, containing 2048 pads of size 1 x 1 mm(2). The sensor pad s are read out by 16 analogue multiplexed readout chips enclosed in the vac uum envelope. A large ultra-high vacuum plant for the evaporation of visibl e-light transmittive bialkali (K2CsSb) photocathodes and subsequent tube en capsulation has been built and successfully operated. The characteristics a nd performance of the first HPDs have been measured to be in full agreement with expectations. (C) 2000 Elsevier Science B.V. All rights reserved.