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\textbf{\small Performance Test of ATLAS MDT chambers in a muon beam at CERN}{\small \par}

{\small Monitored Drift Tube (MDT) chambers in the ATLAS Muon Spectromet consist
of six or eight layers of precision drift tubes filled with the Ar:CO\( _{2} \)
(93:7) gass mixture, under a 3 bar pressure. In order the achieve the required
muon tracking precision of 40 \( \mu  \)m, a single tube position resolution
has to be better than 80 \( \mu  \)m. The performance of one of the chambers
produced at the Max Planck Institute in Munich was studied in the muon testbeam
at CERN. Tracking through the straight muon track coordinates measured by the
tubes of six different layers provides the information about the single tube
resolution. Two years before this resolution has been determined on a prototype
chamber by a different method - using an external reference system. The results
of these two methods are compared.}{\small \par}

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