The LHCb Outer Tracker Detector Design and Production

The Outer Tracker detector of the LHCb experiment is a gas filled detector based on straw tube technology. It comprises three stations each consisting of multiple layers of wires with both vertical orientation and $pm$5$^{mathbf{o}}$ stereo angles. The stations are designed to be built of modules which are mechanically stable, gas tight and capable of stand-alone operation. This paper describes the design and mass production procedures of Outer Tracker modules and discusses the quality assurance programme. Test results on the first modules produced are included.