CAF2 SINGLE-CRYSTALS AS ENTRANCE WINDOWS OF A FAST PHOTOSENSITIVE MWPC FOR A RICH DETECTOR

Authors
JORAM C
Citation
C. Joram, CAF2 SINGLE-CRYSTALS AS ENTRANCE WINDOWS OF A FAST PHOTOSENSITIVE MWPC FOR A RICH DETECTOR, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 343(1), 1994, pp. 246-249
Citations number
5
Categorie Soggetti
Nuclear Sciences & Tecnology","Physics, Particles & Fields","Instument & Instrumentation",Spectroscopy
Journal title
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment → ACNP
ISSN journal
01689002
Volume
343
Issue
1
Year of publication
1994
Pages
246 - 249
Database
ISI
SICI code
0168-9002(1994)343:1<246:CSAEWO>2.0.ZU;2-O
Abstract
CaF2 single crystals (162 X 170 X 3.5 mm3) are used as entrance window s for a photosensitive multiwire proportional chamber (MWPC) being the main component of a Fast RICH detector. Thin silver traces (100 mum w ide with a pitch of 1.5 mm) have been vacuum evaporated onto the surfa ce of the crystals. Thus the windows can be used as the cathode of the MWPC which is operating with a TEA/methane gas mixture at room temper ature. VUV measurements of the optical transmissivity before and after the evaporation reveal a reduction of 7% which is consistent with the geometry of the evaporation mask.