Development of RICH detectors and large-area hybrid photodiodes for the LHCb experiment

Citation
A. Braem et al., Development of RICH detectors and large-area hybrid photodiodes for the LHCb experiment, NUCL INST A, 433(1-2), 1999, pp. 153-158
Citations number
11
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
433
Issue
1-2
Year of publication
1999
Pages
153 - 158
Database
ISI
SICI code
0168-9002(19990821)433:1-2<153:DORDAL>2.0.ZU;2-#
Abstract
The LHCb experiment is being designed to study CP violation in the B meson sector. It differs from other LHC experiments in its excellent particle ide ntification capability. This is accomplished by two focused RICH counters: RICH 1 has 5 cm thick aerogel and 95 cm long C4F10 radiators while RICH 2 u ses 180 cm long CF4 radiator. The combined system will give pi/K separation in the momentum range 1-150 GeV/c. Spherical mirrors are used to focus the Cherenkov light on detection planes equipped with photodetectors. One phot odetector option is the large-area Hybrid Photodiode (HPD). An HPD consists of a cylindrical vacuum envelope of 127 mm diameter capped with a spherica l borosilicate glass entrance window. Electrodes demagnify the image onto a silicon sensor comprising 2048 pads, each with a surface of 1 mm(2). A lar ge UHV evaporation plant for the production of HPDs with visible light bial kali photocathodes (K2CsSb) has been built and successfully operated produc ing photocathodes with good quantum efficiency and stability. A Cold Indium sealing technique has been developed and proven to provide excellent vacuu m tightness. (C) 1999 Elsevier Science B.V. All rights reserved.