Abstract
The Semi-Conductor Tracker (SCT) is a silicon strip detector and one of the key precision tracking devices in the Inner Detector of the ATLAS experiment at the CERN Large Hadron Collider (LHC). The SCT was installed and commissioned within ATLAS in 2007, and has been used to exploit fully the physics potential of the LHC since the first proton–proton collisions at 7TeV were delivered in 2009. In this paper, its operational status throughout data taking up to the end of 2011 is presented, and its tracking performance is reviewed.
Highlights
The ATLAS Inner Detector (ID) is responsible for particle tracking in ATLAS and employs three different detector technologies: a pixel silicon detector closest to the interaction point, the Semi-Conductor Tracker (SCT) micro-strip silicon detector, and a Transition Radiation Tracker
There are two potential sources of inefficiency: errors from the ABCD ASICs which flag that data fragments from those chips cannot be used for tracking, and a BUSY signal from the SCT Data Acquisition System[6] (DAQ) that prevents ATLAS from taking data
Chips may flag an error if they become desynchronised from the ATLAS system, or if their configuration becomes corrupt as a result of Single Event Upsets (SEUs)
Summary
The ATLAS Inner Detector (ID) is responsible for particle tracking in ATLAS and employs three different detector technologies: a pixel silicon detector closest to the interaction point, the SCT micro-strip silicon detector, and a Transition Radiation Tracker. The overall ID is 5.6m long and 2.1m in diameter, and resides in a 2 T axial magnetic field. Wedge shaped sensors of five slightly different sizes to accommodate the more complex geometry. There are 6944 wedge sensors in total, with strip pitch ranging from 56.9 to 90.4μm
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