Abstract

In December 2009 the ATLAS experiment at the CERN Large Hadron Collider (LHC) recorded the first proton-proton collisions at a center-of-mass energy of 900 GeV and this was followed by the unprecedented energy of 7 TeV in March 2010. The SemiConductor Tracker (SCT) is the key precision tracking device in ATLAS, made up from silicon microstrip detectors processed in the planar p-in-n technology. The completed SCT has been installed inside the ATLAS experimental hall. After the commissioning phase it arrived to the first LHC pp collision runs in very good shape: 99.3% of the SCT modules are operational, noise occupancy and hit efficiency exceed the design specifications, the alignment is already close enough to the ideal one to allow on-line track reconstruction and invariant mass determination. This overview presents the current status of the SCT, including results from the latest data-taking periods in 2009 and 2010, and from the detector alignment. We report on the operation of the detector and observed problems. The main emphasis is given to the performance of the SCT with the LHC in collision mode in a comparison with the expected parameters and with the Monte-Carlo simulations.

Highlights

  • The ”A Toroidal LHC ApparatuS” (ATLAS) [1] is a general-purpose high-energy physics experiment designed to explore the proton-proton collisions at the Large Hadron Collider (LHC) [2]

  • We report on the operation of the detector and observed problems

  • The expected ATLAS physics discovery performance is presented in detail in Ref. [3]

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Summary

INTRODUCTION

The ”A Toroidal LHC ApparatuS” (ATLAS) [1] is a general-purpose high-energy physics experiment designed to explore the proton-proton collisions at the Large Hadron Collider (LHC) [2]. The unprecedentedly high collision energy along with the high luminosity at the LHC will eventually allow discovery of possible new physics effects at the TeV scale. With overall dimensions of 44 m in length and 25 m in diameter, ATLAS is the largest ever built high-energy physics experiment. It comprises three basic subsystems: the Inner Detector, housed in a solenoid creating magnetic field of 2 T, the Calorimetry system (hadronic and electromagnetic) and. Each of the three ID components is built of a central barrel section and two end-caps in the forward regions

THE SEMICONDUCTOR TRACKER
SCT operational status
Operational issues
Timing
Efficiency
Findings
CONCLUSION
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