Fabrication and measurements of plastic scintillating fibers

Citation
P. Rebourgeard et al., Fabrication and measurements of plastic scintillating fibers, NUCL INST A, 427(3), 1999, pp. 543-567
Citations number
37
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
427
Issue
3
Year of publication
1999
Pages
543 - 567
Database
ISI
SICI code
0168-9002(19990521)427:3<543:FAMOPS>2.0.ZU;2-A
Abstract
Sixty kilometers of plastic scintillating fibers, 1 mm in diameter, have be en manufactured using a preform/tube technology. The fibers consist of a po lystyrene core surrounded by a polymethylmethacrylate cladding. The fabrica tion method is described and evaluated both qualitatively and quantitativel y. A great effort has been made in order to measure the optical properties of the polymer at the different steps of the production. The global process efficiency is not more than 40% due to the yield of the polymerization pro cess. Using a ternary blue scintillator, the mean light yield for a minimum ionizing particle, passing through a 1 mm diameter fiber at a distance of 1 m, is 5.4 +/- 0.6 photoelectrons. The mean attenuation length fitted betw een 0.5 and 2.0 m is 1.9 +/- 0.2 m. Some specific experiments that give ind ependent measurements of core and interface losses are also reported. The p rincipal cause of light loss is due to the lack of transparency of the poly styrene which leads to a spectral shift in fiber emission. This absorption already appears in the preform rods indicating that the purification and th e polymerization process are of great importance. The attenuation length re lated to core losses is measured at the level of 3 m. The interface losses are about 10(-5)-10(-4) per reflection leading to an equivalent attenuation length of 7 m. (C) 1999 Elsevier Science B.V. All rights reserved.