Abstract
The Fast Tracker (FTK) is a highly parallel processor dedicated to a quick and efficient reconstruction of tracks in the Pixel and Semiconductor Tracker (SCT) detectors of the ATLAS experiment at LHC. It is designed to identify charged particle tracks with transverse momentum above 1 GeV and reconstruct their parameters at an event rate of up to 100 kHz. The average latency of the processing is below 100 μs at the expected collision intensities. This performance is achieved by using custom ASIC chips with associative memory for pattern matching, while modern FPGAs calculate the track parameters. This paper describes the architecture, the current status and a High-Level Data Quality Monitoring framework of the FTK system. This monitoring framework provides an online comparison of the FTK hardware output with the FTK functional simulation, which is run on the pixel and SCT detector data at a low rate, allowing the detection of non-expected outputs of the FTK system.
Highlights
ATLAS [1] is one of the two general-purpose detectors of the Large Hadron Collider (LHC), built for precision tests of the Standard Model (SM), as well as searching for physics beyond the SM atTeV energy scales
To increase the number of interesting events produced in proton-proton (p-p) collisions per unit time, the LHC increases the instantaneous luminosity of the colliding beams, yielding an ever increasing number of p-p interactions in the same bunch crossing
Upon the acceptance of the event, the full information produced so far is built into a complete “event”, which is written to local disks by the System Farm Output
Summary
ATLAS [1] is one of the two general-purpose detectors of the Large Hadron Collider (LHC), built for precision tests of the Standard Model (SM), as well as searching for physics beyond the SM at. In 2015, the LHC started colliding protons at a centre-of-mass energy of 13 TeV and, as shown, the delivered integrated luminosity per year rose from around 4 fb−1 in 2015 to around. 2023, during Run III of the LHC, there will be a further increase in the luminosity as well as in the average number of pile-up events, which are estimated to be approximately 1.5 times larger with respect to the previous run. In these environments, the effective selection of interesting physics events by the ATLAS trigger system will be a big challenge
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