Abstract

OPERA is an experiment dedicated to the observation of νμ into ντ oscillations through τ appearance on the CNGS beam. The experiment is composed by two identical super-modules, each with a target section (made of emulsion/lead bricks alternated to a scintillator Target Tracker) and a muon spectromter (instrumented with bakelite electrodes RPCs and drift tubes). The OPERA RPC system is composed of about 1000 RPCs for an instrumented area of 3000 m2. The RPCs are operated in streamer mode and flushed with the gas mixture Ar/C2H2F4/i−C4H10/SF6 = 75.4/20.0/4.0/0.6 at five refills/day in open flow. The present performance of the RPC system after six years of operation are presented. The aging status of the detector is also described.

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