Tests of wire chamber ageing with CF/sub 4//isobutane (80:20), argon/ethane (50:50), and argon/ethane/CF/sub 4/ (48:48:4)

Conference · Wed Feb 01 04:00:00 EST 1989 · IEEE Trans. Nucl. Sci.; (United States)

OSTI ID:6177155

Henderson, R; Openshaw, R; Faszer, W; Murphy, D; Solomon, M; Sheffer, G

In a series of parallel tests the aging characteristics of CF/sub 4//Isobutane (80:20), Argon/Ethane/CF/sub 4/ (48:48:4), have been investigated. Parameters such as flow rate, gas gain, anode wire current density, and materials in contact with the gas stream have been varied. Some tests have been extended beyond 8 Coulomb/cm of wire. The Ar/Et chambers have shown a high incidence of pulse height degradation, dark currents, cathode foil etching, and deposits on the electrodes. A strong correlation between anode wire current density and rate of damage (%/C/cm) is indicated for Ar/Et chambers. The CF/sub 4//Iso chambers have shown effectively zero pulse height degradation and few other problems to accumulated charges exceeding 5 C/cm, except for one low-flow chamber with some cathode etching and cathode related pulse height degradation. The addition of 4% CF/sub 4/ to the Ar/Et mixture has dramatically improved the aging performance of the Ar/Et/CF/sub 4/ cells.

• Research Organization: Univ. of Melbourne (AU); TRIUMF, 4004 Wesbrook Mall, Vancouver, BC (CA)
• OSTI ID: 6177155
• Report Number(s): CONF-881103-
• Conference Information: Journal Name: IEEE Trans. Nucl. Sci.; (United States) Journal Volume: 36:1
• Country of Publication: United States
• Language: English

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654001 -- Radiation & Shielding Physics-- Radiation Physics
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKANES
ANODES
ARGON
CARBON COMPOUNDS
CARBON FLUORIDES
CATHODES
CURRENT DENSITY
ELECTRODES
ELEMENTS
ETCHING
ETHANE
FILMLESS SPARK CHAMBERS
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
GAS TRACK DETECTORS
GASES
HALIDES
HALOGEN COMPOUNDS
HYDROCARBONS
MATERIALS TESTING
MEASURING INSTRUMENTS
NONMETALS
ORGANIC COMPOUNDS
PARAMETRIC ANALYSIS
PERFORMANCE TESTING
RADIATION DETECTORS
RARE GASES
SPARK CHAMBERS
SURFACE FINISHING
TESTING
WIRE SPARK CHAMBERS