Abstract

An array of 32 thin-walled drift tubes was traversed by a 20 GeV proton beam and the resulting track reconstructed. The spatial resolution was measured as a function of the number of individual coordinates recorded. The frequency of σ-rays and the criteria for the rejection of non-statistically distributed coordinates were studied. A value of σ = (156 ± 5) μm/√ N was obtained using N drift tubes, while the accuracy of an individual tube was found to be σ tube ⋍ 135 μ m .

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