Editing ATLAS experiment (section)

===Detector operation===
Construction was completed in 2008 and the experiment detected its first single [[proton]] beam events on 10 September of that year.<ref>{{cite web|url=http://atlas.cern/updates/atlas-news/first-beam-and-first-events-atlas|title=First beam and first events in ATLAS|date=2008-09-10|publisher=Atlas.ch|access-date=2016-08-16}}</ref>
<!-- old cites that might be useful: <ref>{{cite web| url = http://atlasexperiment.org/news/2007/progress-on-magnets.html | title = Progress on Toroid Magnets | publisher = Cern - Atlas Experiment |author1=Colin Barras |author2=Michael Barnett |date=December 2007}}</ref> -->
Data-taking was then interrupted for over a year due to an LHC [[Large Hadron Collider#Quench incident|magnet quench incident]]. On 23 November 2009, the first proton–proton collisions occurred at the LHC and were recorded by ATLAS, at a relatively low injection energy of 900&nbsp;GeV in the [[center of mass]] of the collision. Since then, the LHC energy has been increasing: 1.8&nbsp;TeV at the end of 2009, 7&nbsp;TeV for the whole of 2010 and 2011, then 8&nbsp;TeV in 2012. 
The first data-taking period performed between 2010 and 2012 is referred to as Run I. After a long shutdown (LS1) in 2013 and 2014, in 2015 ATLAS saw 13 TeV collisions.<ref>[https://www.forbes.com/sites/chadorzel/2015/05/21/things-to-know-as-the-large-hadron-collider-breaks-energy-records/#2715e4857a0b4588cb75b112 "Eight Things To Know As The Large Hadron Collider Breaks Energy Records"].</ref><ref>[http://atlas.ch/news/2015/atlas-completes-first-year-at-13-tev.html "ATLAS Completes First Year at 13 TeV"] {{Webarchive|url=https://web.archive.org/web/20160117090052/http://atlas.ch/news/2015/atlas-completes-first-year-at-13-tev.html |date=2016-01-17 }}.</ref><ref>[http://www.atlas.ch/news/2015/atlas-begins-recording-physics-data-at-13-tev.html "ATLAS Begins Recording Physics Data at 13 TeV"] {{Webarchive|url=https://web.archive.org/web/20160305002833/http://www.atlas.ch/news/2015/atlas-begins-recording-physics-data-at-13-tev.html |date=2016-03-05 }}.</ref>
The second data-taking period, Run II, was completed, always at 13&nbsp;TeV energy, at the end of 2018 with a recorded integrated [[Luminosity (scattering theory)|luminosity]] of nearly 140 fb<sup>−1</sup> (inverse [[femtobarn]]).<ref>{{Cite web |url=https://twiki.cern.ch/twiki/bin/view/AtlasPublic/LuminosityPublicResultsRun2|title=LuminosityPublicResultsRun2 < AtlasPublic < TWiki|website=twiki.cern.ch|access-date=2020-03-10}}</ref> 
A second long shutdown (LS2) in 2019-22 with upgrades to the ATLAS detector<ref>{{Cite book|title=ATLAS|date=2018-05-05|publisher=World Scientific|isbn=978-981-327-179-1|series=Advanced Series on Directions in High Energy Physics|volume=30|language=en|doi=10.1142/11030}}</ref> was followed by Run III, which started in July 2022.<ref>{{cite web|url=https://home.cern/news/news/physics/atlas-moves-top-gear-run-3|title=ATLAS moves into top gear for Run 3|date=16 December 2022|access-date=24 January 2022}}</ref>

{|
|-
| '''Periods of LHC''' || '''operation'''
|-
| 2010 – 2012 || Run I
|-
| 2013 – 2014 || LS1
|-
| 2015 – 2018 || Run II
|-
| 2019 – 2022 || LS2
|-
| 2022 – 2025 || Run III
|}