Abstract
The precision chamber system of the ATLAS muon spectrometer is described. Particular emphasis is put on the mechanical aspects and on the choice of the operation point of the detector.
Highlights
The ATLAS Muon SpectrometerIn the ATLAS detector [1] muons will be measured in two completely independent systems, the Inner Tracker and the Muon Spectrometer
The muon spectrometer instrumentation consists of precision chambers for coordinate measurements in the bending plane: Monitored Drift Tubes (MDT) [2] and Cathode Strip Chambers (CSC) [3] and trigger chambers: Resistive Plate chambers (RPC) [4] in the barrel region and Thin Gap Chambers (TGC) [5] in the forward regions; the trigger chambers provide bunch crossing identi cation and measurement of the second coordinate in the non bending plane
The design consideration with the strongest impact on the design of the ATLAS muon spectrometer is the requirement for stand-alone measurement capability
Summary
In the ATLAS detector [1] muons will be measured in two completely independent systems, the Inner Tracker and the Muon Spectrometer. The inner tracker has a radius of 1.1 m and is surrounded by a superconducting coil which generates a solenoidal eld of 2 T. It is instrumented with pixel detectors, silicon strips and straw tubes with transition radiation detection capability. In this region, muons momenta are measured in a light material but high occupancy environment. The muon spectrometer instrumentation consists of precision chambers for coordinate measurements in the bending plane: Monitored Drift Tubes (MDT) [2] and Cathode Strip Chambers (CSC) [3] and trigger chambers: Resistive Plate chambers (RPC) [4] in the barrel region and Thin Gap Chambers (TGC) [5] in the forward regions; the trigger chambers provide bunch crossing identi cation and measurement of the second coordinate in the non bending plane
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