Performance of the SLD Central Drift Chamber

We report for the first time on the performance of the Central Drift Chamber (CDC) of the Stanford Linear Collider Large Detector (SLD), which has been recording data since 1992. The low mass of the chamber and the use of a gas characterized by both a low drift velocity and low diffusion constant he...

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Published inIEEE transactions on nuclear science Vol. 42; no. 4; pp. 451 - 458
Main Authors Hildreth, M.D., Junk, T.R., Markiewicz, T.W., Masuda, H., Mours, B., Neal, H.A., Prescott, C.Y., Rochester, L.S., Sugiyama, A., Takahashi, T., Usher, T., Young, C.C., Shypit, R., Fero, M.J., Williams, D.C., Massetti, R., Venuti, J., Honma, A.
Format Journal Article Conference Proceeding
LanguageEnglish
Published New York, NY IEEE 01.08.1995
Institute of Electrical and Electronics Engineers
Subjects
Aluminum
Calibration
Detectors
Exact sciences and technology
Experimental methods and instrumentation for elementary-particle and nuclear physics
Frequency measurement
Gas-filled counters: ionization chambers, proportional, and avalanche counters
Magnetic field measurement
Nuclear physics
Physics
Pins
Pulse measurements
Radiation detectors, dosimeters
Superluminescent diodes
Tungsten
Wires
Drift chambers
Radiation detectors
Collider
Bhabha scattering
Charged particles
Stanford linear collider
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Summary:We report for the first time on the performance of the Central Drift Chamber (CDC) of the Stanford Linear Collider Large Detector (SLD), which has been recording data since 1992. The low mass of the chamber and the use of a gas characterized by both a low drift velocity and low diffusion constant help to minimize the drift-distance measurement errors. We describe some of the calibrations and corrections applied to the data, and report on the resolutions achieved thus far. We measure an intrinsic drift resolution of 55-110 /spl mu/m in the region of uniform field. Analysis of the full drift-pulse waveform allows for efficient double-hit resolution of about 1 mm. Momentum resolution is characterized by the formula (dp/sub t//p/sub t//sup 2/)/sup 2/=0.0050/sup 2/+(0.010/p/sub t/)/sup 2/, where p/sub t/ is expressed in units of GeV/c. Used in conjunction with the SLD vertex detector, the CDC permits measurements of impact parameters of high-momentum tracks to the level of 10 /spl mu/m in the r-/spl phi/ plane and 36 /spl mu/m in the r-z plane. A resolution of 6.4% is achieved in the measurement of dE/dx for the electrons in Bhabha scattering events.< >
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0018-9499
1558-1578
DOI:10.1109/23.467802