Abstract
The ATLAS Transition Radiation Tracker (TRT) is the outermost of the three sub-systems of the ATLAS Inner Detector at the Large Hadron Collider at CERN. It consists of close to 300000 thin-wall drift tubes (straws) providing on average 30 two-dimensional space points with 0.12-0.15 mm resolution for charged particle tracks with |η| <; 2 and p <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">T</sub> >; 0.5 GeV. Along with continuous tracking, it provides particle identification capability through the detection of transition radiation X-ray photons generated by high velocity particles in the many polymer fibers or films that fill the spaces between the straws. Custom-built analog and digital electronics is optimized to operate as luminosity increases to the LHC design. In this article, a review of the commissioning and first operational experience of the TRT detector will be presented. Emphasis will be given to performance studies based on the reconstruction and analysis of LHC collisions. The first studies of the TRT detector response to the extremely high track density conditions during the November 2010 heavy ion LHC running period will be presented. These studies give interesting insight to the expected performance of the TRT in future high luminosity LHC proton-proton runs.
Highlights
The ATLAS TRTHow The TRT WorksATL-INDET-SLIDE-2011-200 16 May 2011 TRT Performance Particle IDHeavy Ion RunningSteffen Schaepe, for the ATLAS collaboration LHC Status Hadron collider designed for 14 TeV center of mass energy 40 MHz interaction rate (25 ns bunch spacing)
Tracking provided by ionisation generated by charged particles traversing the straw
Residual distributions show the difference between the fit and measured track position for each hit They show the spatial resolution of the TRT straws
Summary
• 900 GeV in 2009 • 3.5 TeV since March 30th 2010 • Projected to run at this energy in 2011 and 2012 • Luminosity is constantly increasing: data set of 2010 already less than 25% of total data • Heavy Ion collisions at the end of 2010 • Standard Model already “rediscovered”
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