16 Integration of Detectors into a Large Experiment: Examples from ATLAS. . .
733
Thin-gap chambers [TGC]
Cathode strip chambers [CSC]
Barrel toroid
Resistive-plate
chambers [RPC]
End-cap toroid
Monitored drift tubes [MDT]
Fig. 16.15 Cut-away view of the ATLAS muon spectrometer system. displaying the regions in
which the different muon chamber technologies are used
The conceptual layout of the muon spectrometer is shown in Fig. 16.15 and the
main parameters of the muon chambers are listed in Table 16.11. It is based on
the magnetic deflection of muon tracks in the large superconducting air-core toroid
magnets, instrumented with separate trigger and high-precision tracking chambers.
Over the range |η| < 1.4, magnetic bending is provided by the large barrel toroid.
For 1.6 < |η| < 2.7, muon tracks are bent by two smaller end-cap magnets inserted
into both ends of the barrel toroid. Over 1.4 < |η| < 1.6, usually referred to as
the transition region, magnetic deflection is provided by a combination of barrel
and end-cap fields. This magnet configuration provides a field which is mostly
orthogonal to the muon trajectories, while minimising the degradation of resolution
due to multiple scattering. The anticipated high level of particle flux has had a major
impact on the choice and design of the spectrometer instrumentation, affecting
performance parameters such as rate capability, granularity, ageing properties, and
radiation hardness. In the barrel region, tracks are measured in chambers arranged in
three cylindrical layers around the beam axis; in the transition and end-cap regions,
the chambers are installed in planes perpendicular to the beam, also in three layers.
16.5.1.1 Muon Chamber Types
Over most of the η-range, a precision measurement of the track coordinates in the
principal bending direction of the magnetic field is provided by Monitored Drift
Tubes (MDT’s). The mechanical isolation in the drift tubes of each sense wire from
its neighbours guarantees a robust and reliable operation. At large pseudorapidities,
Cathode Strip Chambers (CSC’s, which are multiwire proportional chambers with
733
Thin-gap chambers [TGC]
Cathode strip chambers [CSC]
Barrel toroid
Resistive-plate
chambers [RPC]
End-cap toroid
Monitored drift tubes [MDT]
Fig. 16.15 Cut-away view of the ATLAS muon spectrometer system. displaying the regions in
which the different muon chamber technologies are used
The conceptual layout of the muon spectrometer is shown in Fig. 16.15 and the
main parameters of the muon chambers are listed in Table 16.11. It is based on
the magnetic deflection of muon tracks in the large superconducting air-core toroid
magnets, instrumented with separate trigger and high-precision tracking chambers.
Over the range |η| < 1.4, magnetic bending is provided by the large barrel toroid.
For 1.6 < |η| < 2.7, muon tracks are bent by two smaller end-cap magnets inserted
into both ends of the barrel toroid. Over 1.4 < |η| < 1.6, usually referred to as
the transition region, magnetic deflection is provided by a combination of barrel
and end-cap fields. This magnet configuration provides a field which is mostly
orthogonal to the muon trajectories, while minimising the degradation of resolution
due to multiple scattering. The anticipated high level of particle flux has had a major
impact on the choice and design of the spectrometer instrumentation, affecting
performance parameters such as rate capability, granularity, ageing properties, and
radiation hardness. In the barrel region, tracks are measured in chambers arranged in
three cylindrical layers around the beam axis; in the transition and end-cap regions,
the chambers are installed in planes perpendicular to the beam, also in three layers.
16.5.1.1 Muon Chamber Types
Over most of the η-range, a precision measurement of the track coordinates in the
principal bending direction of the magnetic field is provided by Monitored Drift
Tubes (MDT’s). The mechanical isolation in the drift tubes of each sense wire from
its neighbours guarantees a robust and reliable operation. At large pseudorapidities,
Cathode Strip Chambers (CSC’s, which are multiwire proportional chambers with