review the design and construction of the detector and of its related infrastructures, and report on some technical performances of the various components. The construction of the detector started in 2003 and it was completed in Summer 2008. The experiment is presently in the data taking phase. The whole sequence of operations has proven to be successful, from triggering to brick selection, development, scanning and event analysis.

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The OPERA neutrino detector in the underground Gran Sasso Laboratory (LNGS) was designed to perform the first detection of neutrino oscillations in appearance mode through the JINST 4 P06020Contents 1 Introduction 1 2 Real time detection of the CNGS beam 3 3 Combined analysis of electronic detectors and nuclear emulsion film data 6 4 Conclusions 12