ATLAS Computing
Dimitrios Christidis · CERN Document Server (European Organization for Nuclear Research) · 2026
To achieve its physics program, the ATLAS collaboration operates large, internationally-distributed computing systems and maintains millions of lines of code. This computing infrastructure and software developed have been successfully deployed and utilised during the LHC era to produce a wealth of high energy physics results, with up to 0.5 fb-1 of data recorded in the years 2010-2026. As Run 3 comes to an end, the focus is now firmly on the high Luminosity upgrade of the LHC, the HL-LHC, which is due to begin in 2030 and deliver five times the data collected by ATLAS so far. The computing infrastructure and software are growing in complexity in preparation for the HL-LHC era, and the ATLAS planning for HL–LHC computing started back in 2020 with a Conceptual Design Report outlining various challenges to explore. Following a roadmap defining concrete milestones in 2022 and a series of demonstrators with focused R&D in specific topics, ATLAS will soon publish its Software and Computing TDR, which will not only present the planned status for Run 4 and the beginning of the HL-LHC, but also what is proposed beyond to meet the challenges of this new era of data taking.