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{\bf Abstract \#218} \\
{\bf Parallel sessions: 17} \\
{\bf Plenary sessions: 13}
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\abstractheader{\bf The Muon Spectrometer of the 
ATLAS Detector at the LHC\\
Hubert Kroha, Max-Planck-Institut f\"ur Physik, ATLAS Collaboration}


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The muon spectrometer of the ATLAS experiment consists of three layers
of precision drift chambers in the toroidal magnetic field of a superconducting
air-core magnet. It is designed to provide stand-alone high-precision
muon momentum measurement over a large rapidity range up to the highest
LHC luminosities. The precision muon chambers consist of two multilayers
of high-pressure drift tubes separated by a space frame. In order to
achieve a position resolution of better than 40~$\mu$m,
the drift tube chambers
have to be fabricated with very high mechanical accuracy. 
Internal optical monitors control deformations of the chambers. 
Their relative positions in the
spectrometer will be monitored by a high-precision optical alignment system.
Additional dedicated chambers (resistive plate and thin gap chambers)
in selected layers 
provide fast trigger information and measurement of the track coordinate
along the drift tubes. The operating parameters, aging properties
and long-term reliability of the gas chambers under LHC conditions 
require particular attention. The status of the design of the spectrometer
and of the chamber technologies is discussed.
}


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