Bonn 2020 – wissenschaftliches Programm
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T 14.2: Vortrag
Montag, 30. März 2020, 16:50–17:05, H-HS XV
ATLAS track reconstruction developments for LHC Run 3 and 4 — •Fabian Klimpel1, 2, Andreas Salzburger2, and Stefan Kluth3 for the ATLAS collaboration — 1Technische Universität München — 2CERN — 3Max Planck Institut für Physik
Reconstructing trajectories of particles in high-energy physics experiments require the dominant amount of hardware resources used for the total reconstruction. With the start of the high luminosity LHC the combinatorial complexity of this task will increase. In order to handle future track reconstruction challenges the ATLAS collaboration put much effort into the revision of existing code and the development of new software. In this context an optimisation of the current track reconstruction chain has been performed. An overview over the results and this study will be presented within this talk. In addition to the code changes and optimisations in the reconstructions algorithms ATLAS is deploying a new multi-threaded AthenaMT framework in order to improve the memory/thread scaling. This change requires a thread-safe implementation of the track reconstruction components. Since it represents a major conceptual change compared to a single-core optimised software as used in LHC Run 1 and 2 the ATLAS project ACTS was created. The track reconstruction project is by design thread-safe and serves as detector independent R&D project for future improvements in track reconstruction algorithms. We will present the improvements and prospects of the ATLAS track reconstruction for Run 3 and 4 and give an overview of the status of the ACTS project.