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%          pdftitle={Commissioning of the ATLAS Barrel Muon Spectrometer}
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\textbf{\Large Performance of Fast High-Resolution Muon Drift Chambers for
  LHC Upgrades}  
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\textbf{\large Abstract}  
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\noindent Monitored drift tube chambers are used as precision tracking
detectors in the muon spectrometer of the ATLAS experiment at the LHC
at CERN. These chambers provide a spatial resolution of 40 $\mu$m and
a tracking efficiency of close to 100\% up to background rates of
1~KHz/cm$^{\text{2}}$, the latter being limited mainly by the maximum
drift time of 750~ns.

For LHC upgrades, a faster variant of the drift tube chambers has been
developed, using drift tubes with a diameter of 15~mm instead of
30~mm. The increased channel density and shorter
drift time of 200~ns raise the rate capability to
10~KHz/cm$^{\text{2}}$, while retaining the spatial resolution.

We present results of measurements with chamber prototypes at the Gamma
Irradiation Facility (GIF) at CERN with high $\gamma$ background rates,
and at the H8 beam line with high momentum muons. The response of the
drift tubes to highly ionizing radiation such as neutrons and protons
will be discussed. 

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