A Threshold Gaseous 32-Channel Cerenkov Counter Of The Excharm Spectrometer

A. N. Aleev, V. A. Aref'ev,V. P. Balandin,O. P. Gavrishchuk,A. Zinchenko,I.M. Ivanchenko, A. F. Kamburyan,M. N. Kapishin,N. Karpenko, G. A. Kvirikashvili,V. Kekelidze,D. A. Kirillov,I. G. Kosarev,N. Kuzmin,A. Morozov, A. K. Odishvili,Yu. Potrebenikov, T. B. Progulova, V. A. Sashin,V. Spaskov, G. Tatishvili, P.Z. Khristov,V. K. Semenov,E. G. Devitsin,V. A. Kozlov,M. Zavertyaev

INSTRUMENTS AND EXPERIMENTAL TECHNIQUES（1996）

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摘要

A 32-channel threshold gaseous Cerenkov counter is described. The counter consists of a 420-cm-thick air radiator at atmospheric pressure. Spherical mirrors with a 214-cm radius of curvature along with FEU-125 and FEU-49B photomultipliers are used for collecting and detecting the Cerenkov radiation with the counter. Entrance windows of the photomultipliers are coated with films of spectrum-shifting materials. The charged-particle detection efficiency at the plateau of the threshold response (beta greater than or equal to 0.99984) is better than 97%. The counter is part of a charged-particle identifying system of the EXCHARM spectrometer.

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