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%          pdftitle={Commissioning of the ATLAS Barrel Muon Spectrometer}
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  \textbf{\Large Construction of a High-Resolution Muon Drift Tube Prototype Chamber for LHC Upgrades}
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\begin{center}
\textbf{\large Abstract}  
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\noindent 

The proposed upgrade of the Large Hadron Collider at CERN to
luminosities above $\text{1} \times \text{10}^{\text{34}}$
$\text{cm}^{\text{-2}} \text{s}^{\text{-1}}$ necessitates the
replacement of a large number of tracking chambers of the muon
spectrometer of the ATLAS experiment to avoid deterioration of the
muon identification and the momentum measurement at high background
rates. Furthermore, the installation of additional fast
high-resolution tracking chambers in the innermost detector layer in
the forward region of the muon spectrometer would improve its tracking
performance in the pseudo-rapidity region of 2.0--2.7 even at nominal
LHC operating conditions.
 
The design of a new drift tube chamber with 15 mm diameter aluminum
tubes will be presented, including the development of the high-density
front-end electronics boards.  We describe the assembly procedure
facilitating the required positioning accuracy of the sense wires in
the chamber of 20~$\mu$m and report on our experience with the
construction of a first full-sized prototype chamber with 1152 drift
tubes. Measurements of the achieved mechanical precision and results
of the quality assurance tests will be discussed.

% modular gas system, new passive and active front end elektronic boards
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Monitored Drift Tube chambers are used as precision tracking detectors
in the muon spectrometer of the ATLAS experiment at the LHC at CERN.



The assembly process of the drift chambers ensures the knowledge of
the anode wire positions 



These drift tube chambers are built of 30 mm diameter tubes and have a
maximum drift time of 700 ns. They reach a spatial resolution of 40
$\mu$m and close to 100\% tracking efficiency up to the nominal LHC
luminosity, ensuring the fulfillment of the physics requirement of a
momentum resolution 10\% at muon momenta of 1 TeV. With the proposed
upgrade of the accelerator to luminosities above 1 $\times$
10$^{\text{34}}$ cm$^{\text{-2}}$ s$^{\text{-1}}$ and expected
background rates above 1 KHz/cm^{\text{-2}}
