Slide 1

ATLAS Phase II For the High Luminosity LHC IPRD13 Sienna Italy 07/10/2013 07/10/2013B.Todd Huffman1 Dr. B. Todd Huffman on behalf of the ATLAS Collaboration ( Oxford University, United Kingdom )

Slide 2

CERN, 4 July 2012 Ladies and gentlemen, I think weve got it! Discovery of a Higgs-like particle coupling to gauge bosons 07/10/2013B.Todd Huffman2

Slide 3

Precision measurements of Higgs couplings 07/10/2013B.Todd Huffman3 ttH (with H ) Allows precise measurement of top-Yukawa coupling Cleanest signal (w.r.t WH/ZH) S/B ~20% S/B ~6 with 3000 fb-1 ( x2 better than 300 fb-1) Final states targeted to measure couplings (that have low signal rate at LHC):

Slide 4

Physics at HL-LHC Is this Higgs really THE Higgs?? Also rare decays of known states (like top quarks) Energy upgrade imminent!! New states of matter to be found? SUSY, Hidden SUSY, Z-prime, etc Highly exciting time! 07/10/2013B.Todd Huffman4

Slide 5

Outline High-Luminosity Detector challenges Radiation damage Background rates Tracking Rad. studies; choice of detector technology Detector design concepts (baseline) Trigger HL-LHC studies on electrons and muons Tracking ROI trigger Conclusions 07/10/2013B.Todd Huffman5

Slide 6

What we mean by Phase 2 Upgrade schedule 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2030 ? LHC startup, s= 900 GeV s=7~8 TeV, L=610 33 cm -2 s -1, bunch spacing 50 ns Go to design energy, nominal luminosity s = 13~14 TeV, L ~ 110 34 cm -2 s -1, bunch spacing 25 ns Phase-0 Injector and LHC Phase-1 upgrade to full luminosity s = 14 TeV, L ~ 210 34 cm -2 s -1, bunch spacing 25 ns Phase-I HL-LHC HL-LHC Phase-2 upgrade, IR, crab cavities s = 14 TeV, L = 510 34 cm -2 s -1, luminosity leveling Phase-II LS1 ~3000 fb -1 >=300 fb -1 >=75 fb -1 ~25 fb -1 LS3 LS2 07/10/2013B.Todd Huffman6

Slide 7

Detector Challenges 7 Peak luminosity (leveled) 1 to 5x10 34 cm -2 s -1 ; 3000 fb -1 Higher trigger rate need improved triggers rather than simply raising thresholds globally Multiple interactions per crossing Higher detector occupancy Increasing reconstruction complexity Increasing fluences >10 16 n eq /cm 2 close to the beam pipe Increased radiation damage Increased activation of materials Aging electronics (obsolete technology) Baseline of the future Inner Detector traversed by an event with 230 Pile Up

Slide 8

Phase-II: 2021/2022 (LS3) ATLAS detector upgrade Replacement of the entire Inner Detector LAr and Tile calorimeter electronics upgrades Possible upgrade of Forward Calorimeters Upgrade of Muon system Muon Barrel and Large Wheel trigger electronics Possible upgrades of TGCs in Inner Big Wheels Coping with a track trigger Forward detector upgrade Target Absorber Secondaries (TAS) and shielding upgrade TDAQ upgrade Software and computing Various infrastructure upgrades Common activities (installation, safety, ) 18 month shutdown 8 Phase-II LoI: https://cds.cern.ch/record/1502664?ln=en

Slide 9

The Detector Challenges roughly Split into Two Parts 07/10/20139 >1m radius Pile-up & Trig. Rates; all of the detectors but will show upgrades for Muons and Electrons

L1Track Maintain single lepton trigger thresholds at ~20GeV by adding track information at L1 ~factor 5 rejection with 95% efficiency for offline selected events w.r.t. no L1track case Muon Trigger MU20: require track p T >15GeV in R