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.

The NOMAD experiment is a short base-line search for ν µ → ν τ oscillations in the CERN neutrino beam. The ν τ 's are searched for through their charged-current interactions followed by the observation of the resulting τ − through its electronic, muonic or hadronic decays. These decays are recognized using kinematical criteria necessitating the use of a light target which enables the reconstruction of individual particles produced in the neutrino interactions. This paper describes the various components of the NOMAD detector: the target and muon drift chambers, the electromagnetic and hadronic calorimeters, the preshower and transition radiation detectors, and the veto and trigger scintillation counters. The beam and data acquisition system are also described. The quality of the reconstruction of individual particles is demonstrated through the ability of NOMAD to observe K 0 s 's, Λ 0 's and π 0 's. Finally, the observation of τ − through its electronic decay being one of the most promising channels in the search, the identification of electrons in NOMAD is discussed.

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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