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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 Tube
  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
0.5~kHz/cm$^{\text{2}}$, the former being limited at higher rates
mainly due to space-charge effects and the latter due to the maximum
drift time of 700~ns.

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

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

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