The time-of-flight system for CLAS

Authors
Smith, ES Carstens, T Distelbrink, J Eckhause, M Egiyan, H Elouadrhiri, L Ficenec, J Guidal, M Hancock, AD Hersman, FW Holtrop, M Jenkins, DA Kim, W Loukachine, K MacArthur, K Marchand, C Mecking, B Mutchler, G Schutt, D Smith, LC Smith, TP Taylor, S Tung, TY Weisenberger, A Welsh, RE
Citation
Es. Smith et al., The time-of-flight system for CLAS, NUCL INST A, 432(2-3), 1999, pp. 265-298
Citations number
44
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
01689002 → ACNP
Volume
432
Issue
2-3
Year of publication
1999
Pages
265 - 298
Database
ISI
SICI code
0168-9002(19990811)432:2-3<265:TTSFC>2.0.ZU;2-#
Abstract
The time of flight system for the CEBAF Large Acceptance Spectrometer (CLAS ) at the Thomas Jefferson National Accelerator Facility is described. The s ystem, covering an area of 206 m(2), is composed of scintillation counters 5.08 cm thick, 15 and 22 cm wide, and lengths which vary from 32 cm at the most forward angle to 450 cm at larger angles. All of the components of the system have been designed to optimize the time resolution. Event timing, a chieved by leading-edge discrimination with time-walk correction, has been measured with cosmic rays, a laser pulser, and known particle interactions. The intrinsic time resolution varies from about 80 ps for the short counte rs to 160 ps for the longer counters. Reconstruction of interacting particl es during the first period of operation yields an average time resolution f or electrons of 163 ps. (C) 1999 Elsevier Science B.V. All rights reserved.