The OPERA experiment is designed to study the v(mu) -> v(tau) oscillation observing the v(tau) appearance in a pure v(mu) beam over a base line of 732 km from CERN to Gran Sasso Laboratory. The apparatus consists of a lead/emulsion-film target complemented by electronic detectors and muon spectrometers for muon charge and momentum measurements. The tracking inside the magnets is provide by Bakelite RPC chambers in a large scale application. The commissioning of the RPC system ended in August 2006. The paper present the layout of the RPC system and its performances. (C) 2009 Elsevier B.V. All rights reserved.
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