Operation of drift chambers with helium based mixtures

Conference · Mon Aug 01 00:00:00 EDT 1994 · IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States)

OSTI ID:6815594

Sharma, A ^[1]; Sauli, F ^[2]

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1. INFN, Torino (Italy)
2. CERN, Geneva (Switzerland)

Helium based gas mixtures have been investigated for lowering multiple scattering contributions to the momentum resolution for intermediate energy particles. The relevant transport parameters, namely drift velocity and diffusion have been calculated for several mixtures and compared to standard argon based mixtures. Some fast, low diffusion mixtures have been identified. The small Lorentz angle computed make them promising candidates for drift chamber operation in magnetic fields. Measurements on high accuracy drift chambers in a test beam with a helium-DME (dimethyl ether) (70-30) mixture have resulted in a spatial resolution ranging from 70[mu]m to 100[mu]m.

• OSTI ID: 6815594
• Report Number(s): CONF-931051-; CODEN: IETNAE; TRN: 94-023048
• Journal Information: IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States), Vol. 41:4Pt1; Conference: NSS-MIC '93: nuclear science symposium and medical imaging conference, San Francisco, CA (United States), 30 Oct - 6 Nov 1993; ISSN 0018-9499
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
DRIFT CHAMBERS
OPERATION
PERFORMANCE TESTING
IONIZATION
MESON FACTORIES
ACCELERATORS
MEASURING INSTRUMENTS
MULTIWIRE PROPORTIONAL CHAMBERS
PROPORTIONAL COUNTERS
RADIATION DETECTORS
TESTING
440104* - Radiation Instrumentation- High Energy Physics Instrumentation