THE ATLAS SILICON MICROSTRIP TRACKER CONSTRUCTION STATUS

The Semiconductor Tracker (SCT) is based on a large area of silicon microstrip sensors inside the ATLAS inner detector system. About 4100 detector modules must be assembled and placed on 4 barrel cylinders and 18 forward disks. Most of the modules are composed of 4 single sided detectors mounted back to back with 40 mrad rotation allowing the reconstruction in the other direction. The sensors are read-out by a copper/Kapton multilayer hybrid which holds 12 binary read-out ASICs. The commands and data are transmitted via optical fibers. The SCT is designed to operate 10 years in the LHC and, all the active and passive module components must survive a high radiation level. A description and a current status of the silicon detectors and the SCT modules will be given. The electrical performances of the prototype modules will also be discussed.