Precision aspects of ATLAS muon chamber design and construction

The ATLAS Muon Collaboration is aiming to build a Muon Spectrometer with unprecedented standalone muon momentum resolution of ∼10% at particle momenta of 1 TeV/c over a wide range of transverse momenta, pseudorapidity, and azimuthal angle. The ATLAS Muon Spectrometer consists mainly of Monitored Drift Tube (MDT) chambers for precision tracking, installed everywhere except in the very forward area where Cathode Strip Chambers will be used. The precision chambers are complemented by trigger chambers which are Resistive Plate Chambers for the Barrel region and with Thin Gap Chambers in the Endcap region of the spectrometer. In order to achieve the targeted excellent momentum resolution, wires within the MDT chambers have to be positioned with an accuracy of 20 μm (rms) to avoid limiting the overall chamber resolution of ∼50 μm. We will discuss aspects of a worldwide distributed precision production of the 1200 MDT chambers needed for the spectrometer, including construction and quality control aspects up until commissioning.