Operation of the ATLAS trigger system in Run 2

The ATLAS collaboration, et al. (2020) Operation of the ATLAS trigger system in Run 2. Journal of Instrumentation, 15(10), P10004. (doi: 10.1088/1748-0221/15/10/P10004)

Abstract

The ATLAS experiment at the Large Hadron Collider employs a two-level trigger system to record data at an average rate of 1 kHz from physics collisions, starting from an initial bunch crossing rate of 40 MHz. During the LHC Run 2 (2015–2018), the ATLAS trigger system operated successfully with excellent performance and flexibility by adapting to the various run conditions encountered and has been vital for the ATLAS Run-2 physics programme. For proton-proton running, approximately 1500 individual event selections were included in a trigger menu which specified the physics signatures and selection algorithms used for the data-taking, and the allocated event rate and bandwidth. The trigger menu must reflect the physics goals for a given data collection period, taking into account the instantaneous luminosity of the LHC and limitations from the ATLAS detector readout, online processing farm, and offline storage. This document discusses the operation of the ATLAS trigger system during the nominal proton-proton data collection in Run 2 with examples of special data-taking runs. Aspects of software validation, evolution of the trigger selection algorithms during Run 2, monitoring of the trigger system and data quality as well as trigger configuration are presented.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Robson, Professor Aidan and Warrack, Neil and Howarth, Dr James and Ferrando, Dr James and Borbely, Mr Albert and Blue, Dr Andrew and Ravina, Mr Baptiste and Pollard, Dr Chris and Doyle, Professor Anthony and Gray, Chloe and Bates, Dr Richard and Ferreira De Lima, Dr Danilo and Callea, Dr Giuseppe and Buckley, Professor Andy and Connelly, Dr Ian and O'Shea, Professor Val and Buzatu, Dr Adrian and Owen, Professor Mark and Spiteri, Dr Dwayne and Jamieson, Dr Jonathan and Cunningham, Dr Liam and Bussey, Dr Peter and Fabbri, Dr Federica and Buttar, Professor Craig and Stewart, Dr Graeme and D'Auria, Dr Saverio and Wraight, Dr Kenneth and Britton, Professor David and Breaden Madden, William and Rennie, Adam and Knue, Dr Andrea
• Authors: The ATLAS collaboration, , Bates, R.L., Blue, A., Borbély, A.G., Breaden Madden, W.D., Britton, D., Buckley, A.G., Bussey, P.J., Buttar, C.M., Buzatu, A., Callea, G., Connelly, I.A., Cunningham, W. R., D'Auria, S., Doyle, A.T., Fabbri, F., Ferrando, J., Ferreira de Lima, D.E., Gray, C., Howarth, J., Jamieson, J., Knue, A., O'Shea, V., Owen, M., Pollard, C.S., Ravina, B., Rennie, A.G., Robson, A., Spiteri, D.P., Stewart, G.A., Warrack, N., and Wraight, K.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Journal of Instrumentation
• Publisher: IOP Publishing
• ISSN: 1748-0221
• ISSN (Online): 1748-0221
• Published Online: 02 October 2020
• Copyright Holders: Copyright © 2020 CERN for the benefit of the ATLAS collaboration
• First Published: First published in Journal of Instrumentation 15(10): P10004
• Publisher Policy: Reproduced under a Creative Commons License