Abstract

The ATLAS Muon Spectrometer consists of a system of precision tracking and trigger chambers embedded in a 2–8 Tm magnetic field generated by three large air-core superconducting toroids. The precision Monitored Drift Tube (MDT) chambers measure the track sagitta up to a pseudorapidity of 2.7 with a 40µm uncertainty yielding a design muon transverse momentum resolution of 10% at 1 TeV. Muon tracking is complemented in the very forward region by Cathode Strip Chambers (CSC). The calibration program, essential to achieve the spectrometer design performance and physics reach, is conducted at three worldwide computing centers. These centers each receive a High Level Trigger data stream that enables high statistics determination of timing offset constants and drift-time to drift-space conversion relationship. During the LHC data taking periods in 2010 and 2011, a system of periodic calibration updates has been established. The calibration algorithms, methods and tools and performance results for this first period of LHC collision data will be presented.

Highlights

  • The ATLAS Muon Spectrometer consists of a system of precision tracking and trigger chambers embedded in a 2-8 Tm magnetic field generated by three large air-core superconducting toroids

  • In the most forward region of the end-cap inner regions, the Cathode Strip Chambers (CSC) are used since they are able to cope with higher background rates

  • The trigger chambers are based on two technologies: the Resistive Plate Chambers (RPC) instrument the barrel while the Thin Gap Chambers (TGC) are used in the higher background environment of the end-caps

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Summary

INTRODUCTION

For the second year running, the LHC team has largely surpassed its operational objectives, steadily increasing the rate at which the LHC has delivered data to the experiments”. This is the first sentence of the press release sent by the Director of CERN just after the closure of the IEEE NSS 2011 Conference, clearly stating the great success of a first period of operation of a machine and detectors of unprecedented complexity and performance. ATLAS is a multipurpose detector [1], [2] installed at the Large Hadron Collider (LHC) at CERN where two proton beams collide at a center-of-mass-energy of 7 TeV.

THE ATLAS MUON SPECTROMETER
THE MONITORED DRIFT TUBES CHAMBERS AND
The Muon Calibration Stream
Precision and Stability of the Calibration constants
Findings
CONCLUSIONS
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