The target tracker detector for OPERA experiment

The neutrino oscillation experiment OPERA which will start taking data in 2006 in Gran Sasso National Laboratory (Italy) is now under construction and installation. The most important part of the OPERA detector consists of 62 walls made of nuclear emulsion/lead bricks (total mass of ∼1.7 kton) interlaced with planes of tracking detector (target tracker) which has to provide an information about the location of the neutrino interaction in OPERA detector. The design of the target tracker detector is based on scintillator strips (2.6 × 1.0 × 683 cm³) equipped with wavelength-shifting fibers to transport the light produced by crossing particles to multi-channel photomultipliers. One plane of the target tracker detector (7 × 7 m²) consists of 256 strips. The mass production of the target tracker modules goes on now at IReS (Strasbourg). About 5700 m² of the detectors will be produced in total during next few months. The design, expected performance, results of the tests and calibration of the target tracker modules as well as some details of the detector production technology are presented.