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Author Keppel, C.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS ♦ MAGNETIC SPECTROMETERS ♦ WINDOWS ♦ PERFORMANCE TESTING ♦ CEBAF ACCELERATOR ♦ VACUUM SYSTEMS
Abstract Large aperture low mass vacuum windows are being developed for the HMS (High Momentum Spectrometer) and SOS (Short Orbit Spectrometer) spectrometers in Hall C at CEBAF. Because multiple scattering degrades the performance of a spectrometer it is important that the volume be evacuated and that the entrance and exit windows be as low mass as possible. The material used for such windows must be thin and light enough so as to have minimum effect of the beam, and at the same time, be thick and strong enough to operate reliably and safely. To achieve these goals, composite vacuum windows have been constructed of a thin sheet of Mylar with a reinforcing fabric. Reinforcing fabrics such as Kevlar and Spectra are available with tensile strengths significantly greater than that of Mylar. A thin layer of Myler remains necessary since the fabrics cannot achieve any sort of vacuum seal. The design, fabrication, testing, and operating experience with such composite windows for the Hall C spectrometers will be discussed.
ISSN 00030503
Educational Use Research
Learning Resource Type Article
Publisher Date 1995-04-01
Publisher Place United States
Journal Bulletin of the American Physical Society
Volume Number 40
Issue Number 2
Technical Publication No. CONF-9304297-


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