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          Institute: MPI für Physik     Collection: MPI für Physik     Display Documents

ID: 544082.0, MPI für Physik / MPI für Physik
Operation of the ATLAS muon drift-tube chambers at high background rates and in magnetic fields
Authors:Dubbert, Jörg; Horvat, Sandra; Kharchenko, Dmitri; Kortner, Oliver; Kotov, Sergei; Kroha, Hubert; Manz, Andreas; Mohrdieck-Möck, Susanne; Nikolaev, Kiril; Rauscher, Felix; Richter, Robert; Staude, Arnold; Stiller, Wolfram; Valderanis, Chrysostomos
Date of Publication (YYYY-MM-DD):2006
Title of Journal:IEEE Transactions on Nuclear Science
Journal Abbrev.:IEEE Transactions on Nuclear Science
Issue / Number:53
Start Page:562
End Page:566
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:In the ATLAS muon spectrometer, large drift-tube
chambers are used for precision tracking. The chambers will be
operated at a high neutron and background resulting in count
rates of up to 500 Hz cm−2 corresponding to 300 kHz per tube.
The spatial resolution of the drift tubes is degraded from 82 μm
without background to 108 μm at 500 Hz cm−2 background count
rate. Due to afterpulsing in the Ar/CO2 gas mixture used in the
drift tubes, ionizing radiation causes more than one hit in a tube
within the maximum drift time of about 800 ns which is expected
for magnetic field strengths around 1.2 T. In order to limit the
count rate, the drift tubes are read out with an artificial dead
time of 790 ns which causes an efficiency loss of 23% at a rate of
300 kHz per tube. The space-to-drift-time relationship of the tubes
varies with background rate, temperature, and magnetic field
strength. The mean magnetic field strength in a muon chamber
is 0.4 T on the average, but may vary by up to 0.4 T within a
chamber. The space-to-drift-time relationship must therefore be
determined in short time intervals with an accuracy better than
20 μm using muon tracks and applying corrections for measured
magnetic field variations.
Classification / Thesaurus:ATLAS
External Publication Status:published
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Physik
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