A preshower photon multiplicity detector for the WA98 experiment

Citation
M. Aggarwal et al., A preshower photon multiplicity detector for the WA98 experiment, NUCL INST A, 424(2-3), 1999, pp. 395-413
Citations number
22
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
424
Issue
2-3
Year of publication
1999
Pages
395 - 413
Database
ISI
SICI code
0168-9002(19990321)424:2-3<395:APPMDF>2.0.ZU;2-F
Abstract
A high granularity preshower detector has been fabricated and installed in the WA98 Experiment at the CERN SPS for measuring the spatial distribution of photons produced in the forward region in lead-ion-induced interactions. Photons are counted by detecting the preshower signal in plastic scintilla tor pads placed behind a 3 radiation length thick lead converter and applyi ng a threshold on the scintillator signal to reject the minimum ionizing pa rticles, Techniques to improve the imaging of the fibre and performance of the detector in the high multiplicity environment of lead-lead collisions a re described. Using Monte-Carlo simulation methods and test beam data of pi (-) and e(-) at various energies the photon counting efficiency is estimate d to be 68% for central and 73% for peripheral Pb+Pb collisions. (C) 1999 E lsevier Science B.V. All rights reserved.