The ARGUS microvertex drift chamber

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Abstract

The ARGUS collaboration is currently building a new microvertex drift chamber (μVDC) as an upgrade of their detector. The μVDC is optimized for B-meson physics at DORIS energies. Important design features are minimal multiple scattering for low-momentum particles and three-dimensional reconstruction of decay vertices with equal resolutions in r-φ and r-z. Vertex resolutions of 15–25 μm are expected. Prototypes of the μVDC have been tested with different gas mixtures at various pressures. Spatial resolutions as small as 20 μm were obtained using CO2/propane at 4 bar and DME at 1 bar. New readout electronics have been developed for the μVDC aiming at low thresholds for the TDC measurements. Employing a novel idea for noise and cross-talk suppression, which is based on a discrimination against short pulses, very low threshold settings are possible.

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Supported by the German Bundesministerium für Forschung und Technologie, under contract 054DO51P

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Supported by the Natural Sciences and Engineering Research Council, Canada.

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Carleton University, Ottawa, Ontario, Canada.

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McGill University, Montreal, Quebec, Canada.

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University of Toronto, Ontario, Canada.

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Supported by the US National Science Foundation.

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