Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 18: DAQ und Trigger I

T 18.2: Talk

Monday, March 25, 2019, 16:20–16:35, ST 2

Adapting the ATLAS Fast Tracker track fit constants to new detector conditions — •Emily Thompson — DESY

During the Run 3 of the LHC, the number of simultaneous proton-proton collisions is expected to rise to an average of 80 events per bunch crossing. This poses a significant challenge for the trigger system of ATLAS, which aims to select interesting signal events with high purity at a rate of only 1 kHz.

The ATLAS Fast Tracker (FTK) is a hardware based track finding system which is designed to provide full tracking information at an early stage of the ATLAS trigger system. The FTK is a highly parallelized system which performs pattern matching between hits in the silicon trackers and one billion simulated patterns stored in ASIC Associative Memory chips, allowing to exploit tracking information in the ATLAS trigger system.

Once a track is found, track parameters are estimated using a linear approximation with pre-calculated constants. The generation of these fit constants is a time consuming process which utilizes 300 million single muon tracks. This presentation addresses the current progress for developing strategies to quickly adapt the FTK fit constants to changing module positions and orientations in the tracking detectors.