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Wire chamber aging with CF/sub 4//isobutane and argon/ethane mixtures

Conference · · IEEE Trans. Nucl. Sci.; (United States)
OSTI ID:7145698
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Using several identical test cells, the authors investigated the aging characteristics of CF/sub 4//Isobutane (80:20) and Argon/Ethane (50:50). The gas gain and gas flow rate were varied and the measurements extended beyond 6 Coulomb/cm of wire (C/cm). Study of a third gas mixture Ar/Eth/CF/sub 4/ (48:48:4) is at an early stage. The Ar/Eth mixture has shown a variety of problems including cathode foil etching, anode deposits, dark currents and pulse height degradation. In contrast the CF/sub 4//Iso mixture produced some cathode etching for low flow velocities and only very minor anode deposits. With very little pulse height degradation or dark current this mixture is an excellent candidate for a high rate chamber. A small area MWPC using this mixture has been evaluated in a pion beam with particle fluxes up to 3x10/sup 7/ particles/cm/sup 2/-sec.

Research Organization:
TRIUMF, 4004 Wesbrook Mall, Vancouver, B.C. (CA)
OSTI ID:
7145698
Report Number(s):
CONF-871006-
Journal Information:
IEEE Trans. Nucl. Sci.; (United States), Journal Name: IEEE Trans. Nucl. Sci.; (United States) Vol. 35:1; ISSN IETNA
Country of Publication:
United States
Language:
English

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Related Subjects

440104* -- Radiation Instrumentation-- High Energy Physics Instrumentation
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
645101 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALKANES
ARGON
BEAMS
CATHODES
DISPERSIONS
ELECTRODES
ELEMENTS
ETCHING
ETHANE
FLOW RATE
FLUIDS
FOILS
GASES
HYDROCARBONS
MEASURING INSTRUMENTS
MESON BEAMS
MIXTURES
MULTIWIRE PROPORTIONAL CHAMBERS
NONMETALS
ORGANIC COMPOUNDS
PARTICLE BEAMS
PION BEAMS
PROPORTIONAL COUNTERS
RADIATION DETECTORS
RARE GASES
SURFACE FINISHING
THERMAL DEGRADATION