CERN Accelerating science

ATLAS Slides
Report number	ATL-SOFT-SLIDE-2021-152
Title	Improvements to ATLAS Inner Detector Track reconstruction for LHC Run-3
Author(s)	Schillaci, Zachary Michael (Brandeis University (US)) ; Vessella, Makayla (University of Massachusetts (US)) ; Swatman, Stephen Nicholas (University of Amsterdam (NL)) ; Goblirsch-Kolb, Maximilian Emanuel (Brandeis University (US)) ; Cairo, Valentina (SLAC National Accelerator Laboratory (US)) ; Pettersson, Nora Emilia (CERN)
Corporate author(s)	The ATLAS collaboration
Collaboration	ATLAS Collaboration
Submitted to	25th International Conference on Computing in High-Energy and Nuclear Physics (CHEP), Online, Online, 17 - 21 May 2021
Submitted by	[email protected] on 17 May 2021
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	Tracking ; Reconstruction ; Software ; Computing ; Run-3
Abstract	This talk summarises the main changes to the ATLAS experiment’s Inner Detector Track reconstruction software chain in preparation of LHC Run 3 (2022-2024). The work was carried out to ensure that the expected high-activity collisions with on average 50 simultaneous proton-proton interactions per bunch crossing (pile-up) can be reconstructed promptly using the available computing resources. Performance figures in terms of CPU consumption for the key components of the reconstruction algorithm chain and their dependence on the pile-up are shown. For the design pile-up value of 60 the updated track reconstruction is a factor of 2 faster than the previous version.
Related document	Conference Paper ATL-SOFT-PROC-2021-014