Abstract
An optical method for estimating deviation from the linearity of straws with a diameter of 4 mm and a length of 60 cm mounted in the ring frames of a detector is described. The maximum permissible deviation from linearity of straws is 400 μm, and the amplitudes of signals from a 55Fe source vary along the straws by no more than 9%. The results of this optical-linearity checkup agree fairly well with the data obtained using a more accurate method (the measurement of amplitude characteristics with a 55Fe source) for determining the deviation of a straw from the anode axis.
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Original Russian Text © N. Grigalashvili, G.D. Kekelidze, V.V. Myalkovskiy, V.D. Peshekhonov, 2015, published in Pis’ma v Zhurnal Fizika Elementarnykh Chastits i Atomnogo Yadra, 2015.
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Grigalashvili, N., Kekelidze, G.D., Myalkovskiy, V.V. et al. Optical selection of straws for the MPD endcap tracker. Phys. Part. Nuclei Lett. 12, 113–117 (2015). https://doi.org/10.1134/S1547477115010112
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DOI: https://doi.org/10.1134/S1547477115010112