A forward magnetic spectrometer system for high-energy heavy-ion experiments

Citation
K. Shigaki et al., A forward magnetic spectrometer system for high-energy heavy-ion experiments, NUCL INST A, 438(2-3), 1999, pp. 282-301
Citations number
28
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
438
Issue
2-3
Year of publication
1999
Pages
282 - 301
Database
ISI
SICI code
0168-9002(199912)438:2-3<282:AFMSSF>2.0.ZU;2-K
Abstract
A small aperture magnetic spectrometer has been built to study hadron produ ction in Au-197 + Au-197 collisions at the AGS energy of 11.6A GeV/c. It op erates in the forward angular range from 6 to 30 degrees with respect to th e incident beam axis and covers the mid-rapidity region for heavy particles such as protons. The detector components of the spectrometer system includ e two time projection chambers, four drift chamber modules and a time-of-fl ight scintillation counter wall. A few new technologies are implemented in the design of the system to achieve the performance goals. The spectrometer has proved to function properly under the high particle-density environmen t encountered in experiments with the heavy-ion colliding system. The achie ved momentum resolution is 1.3% in r.m.s. for pions at 1 GeV/c and 1.6% for protons at the same momentum. With the time-of-flight resolution of 76 ps in r.m.s., the particle identification momentum limit extends to 4 GeV/c fo r pions, 3 GeV/c for kaons, 5 GeV/c for protons, and 4.5 GeV/c for anti-pro tons. The tracking efficiency stays above 86% for tracks up to 5 GeV/c with as many as 10 tracks in the spectrometer aperture. (C) 1999 Elsevier Scien ce B.V. All rights reserved.