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Status of Atlas

Stan Bentvelsen SAC 2008 . Status of Atlas. ATLAS. Muon precision chamber 96 MDT BOL chambers. Semi Conducting Tracker Installation Endcap. End-cap toroids In-kind contribution. Trigger/DAQ Muon Read Out Drivers. Computing readiness. Combined Tracking

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Status of Atlas

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  1. Stan Bentvelsen SAC 2008 Status of Atlas Atlas program - Stan Bentvelsen - SAC April 17, 2008

  2. ATLAS Muon precision chamber 96 MDT BOL chambers Semi Conducting Tracker Installation Endcap End-cap toroids In-kind contribution Trigger/DAQ Muon Read Out Drivers Computing readiness Combined Tracking Software contribution Physics performance Atlas program - Stan Bentvelsen - SAC April 17, 2008

  3. Nikhef highlights of the last year • SCT • Endcapinstalled • afterdelaysdue to coolingproblems in the barrel • All modules tested & functional • Muons • All BOL chambersinstalled • Detector Control System ~ready • Alignment system operational • Data acquisition • Muon Read Out Drivers in place • EndcapToroids • Installation in Atlas • Computing • Developedanalysis model • Monte Carlo validation • Performance • Muon trackingoptimization • Combinedtracking • Physics • Physicsreadinessnoteactivities • Commissioningtop-quark • One lepton Susy • Higgs vector boson fusion Atlas program - Stan Bentvelsen - SAC April 17, 2008

  4. Nikhef-Atlas group • Age profile Atlas group: • 16 fte permanent staff • Geographic location • Amsterdam: FOM & UvA • 13 fte perm staff • Nijmegen: FOM & RU • 3 fte perm staff • Involvement in ATLAS management • Nigel Hessey – Upgrade coordinator • KorsBos – Computing Operation coordinator • Peter Kluit – Convener muon combined performance • WouterVerkerke – Physics validation coordinator • Patrick Werneke – Technical coordinator SCT endcaps • Stan Bentvelsen – Advisory committee CB • OlyaIgonkina – Tau trigger convener • New Atlas members since last SAC • 6 PhD students • FOM m/v O. Igonkina • 4 PostDocs (Atlas, VIDI, VICI) Atlas program - Stan Bentvelsen - SAC April 17, 2008

  5. Transport of the End-Cap Toroid Atlas program - Stan Bentvelsen - SAC April 17, 2008

  6. Lowering the End-Cap Toroid June 4th & July 11th 2007 Installation Atlas program - Stan Bentvelsen - SAC April 17, 2008

  7. 2 meter 5.6 meter Semi Conductor Tracker • 6.2 million readout channels • Barrel • 4 cylindrical layers • 2112 modules • coverage 0<|η|<1.1-1.4 • ‘Sign-off’ completed in december 2007 • End-Caps • 18 discs • 1976 modules • coverage 1.1-1.4<|η|<2.5 • ‘Sign off’ January 2008 • SCT endcap A assembled & installed by NIKHEF! SCT Barrel SCT End-Caps Atlas program - Stan Bentvelsen - SAC April 17, 2008

  8. Installation in Atlas SCT+TRT endcap installation Atlas program - Stan Bentvelsen - SAC April 17, 2008

  9. ATLAS - SCT cosmics • Barrel and Endcaps • Participation in ATLAS wide milestone run ‘M6’ early March • Combined runs show normal noise in modules and smooth data acquisition • Cooling problems • Heater Failure has seriously delayed the commissioning but heaters are now in place and operational. • Leak in coolingloop may cause a small loss (<1%) in working modules (Endcap C) • Cosmics measured in ATLAS cavern with SCT and TRT ! Atlas program - Stan Bentvelsen - SAC April 17, 2008

  10. 2007: Installation SCT Atlas program - Stan Bentvelsen - SAC April 17, 2008

  11. 2007: Installation of Nikhef’s MDT BOL chambers completed! Atlas program - Stan Bentvelsen - SAC April 17, 2008

  12. Status MDT chambers • All barrel MDT chambers in place • Nikhef BOL chambersoperatesmoothly • Problems in power supplies • 50% have HV • 75% have LV • Qualitymonitoringok • Routinelytakingcosmics • More than 3 million recentcosmiceventsavailable • Data processingthrough central CERN computingfacilities ("Tier 0") • Nikhef participation • Thisevent is taken yesterday Atlas program - Stan Bentvelsen - SAC April 17, 2008

  13. sector 5A sector 5C sector 13A Muon Direction Distribution Atlas program - Stan Bentvelsen - SAC April 17, 2008

  14. Detector Control System (DCS) • Nikhef heavily involved in DCS system: • MDT-DCS module • Temperature • B-field • Front-End electronics • Alignment • Barrel Atlas program - Stan Bentvelsen - SAC April 17, 2008

  15. DCS status of muon barrel • Nikhef responsabilities in B- and T- systems • All T-sensorsinstalled – 98% operational • B-field sensors tested and intercalibrated at upcomingmagnet test Atlas program - Stan Bentvelsen - SAC April 17, 2008

  16. Alignment system & Nikhef Goal: 20 mm mechanicalprecision • Projectivealignment • Close to finished • Acquisition speed up • Rate of imaging analyses increasedby factor 100 • Full readout in 15 mins • 370 images analysed/min Atlas program - Stan Bentvelsen - SAC April 17, 2008

  17. Data Acquisition • All 204 Muon Read Out Driversinstalled in USA15 • Input data from 1150 muon chamers • Output: to 16 ROS PC with 4/5 ROBIns per PC (700 ROBINs in Atlas) Since last year: • production 255 MRODs • testing, repairing in 15 VME crates • Installation, commissioning • Stable running. Few subtle problems found & solved • ROBIN’s activities • firmware upgrades • The ATLAS ROBIN R Cranfieldet al 2008 JINST 3 T01002  OlyaIgonkina Atlas program - Stan Bentvelsen - SAC April 17, 2008

  18. High level streaming & trigger • Routing and Streaming in the Higher Level Trigger • Distinguish between physics and calibration events • Flexible Routing and Streaming implementation allows transparent addition of Remote Online Farms • Responsibility for single tau, tau+Missing_ET triggers performance (HLT) • Design of complex, multi-objects trigger signatures • New Nikhef activity, driven by new staff member: O. Igonkina Large involvement of Nikhef Atlas program - Stan Bentvelsen - SAC April 17, 2008

  19. Muon reconstruction ATLAS • Muon (standalone) reconstruction • Main contributions to the modular Moore reconstruction • Pattern recognition • Segment finding • Track finding and fitting • Substantial improvements • Efficiency (low momenta) • Efficiency and fake rate in cavern background events • Combined reconstruction • ID + MS with Cal energy corrections • Combined muon identification • Calorimeter tag: requiring a m.i.p. in the Hadron Calorimeter • Muon Segment tagging reconstruction • Refit of inner detector and MS track η Efficiency Z→μμ with cavern backgrnd Atlas program - Stan Bentvelsen - SAC April 17, 2008

  20. Physics readiness activities • Computing Services Commissioning (2007) • Exercise computing infrastructure for large scale production of simulated events. • Publish series of notes that give update on ATLAS physics performance on 100 pb-1 to 1fb-1. • Separate ‘Analysis Model Forum’ to review analysis experience of CSC • Calibration Data Challenge (2007) • Calibrate, align detector with ‘data procedure’ on MC sample • Tests full chain: procedures, database infrastructure etc… MenelaosTsiakiris Atlas program - Stan Bentvelsen - SAC April 17, 2008

  21. Computing & Grid • Validation of Simulation, Reconstruction software • Scope: Event generation, Simulation (full Geant-4, fast parameterized simulation and hybrid forms), Reconstruction, derived physics data (TAGS) • Activities lead by W. Verkerke (Sep 2006 – present), represented in physics and software management • Validated simulation and reconstruction of CSC excerise (Release 12). Over 50 million events simulation with G4 and reconstructed with validated software [ done ] • Validation of updated G4 software and parameter tuning for Final Dress rehearsal (Release 13) and first data [done] Atlas program - Stan Bentvelsen - SAC April 17, 2008

  22. Final Dress Rehearsal • Grid operation • KorsBos in Atlas’ computing management • Operation of computing model with Tier1 and Tier2’s • From April 2008 new Nikhef colleague for Tier1 • Final Dress rehearsal • Exercise of completecomputing infrastructure from Tier0 (ATLAS pit) to end-user analysis. • Mix samples of simulated events into ‘data-like’ sample, simulate trigger, perform streaming based on trigger info, reconstruct data in Tier-1 centers, perform users analysis. Do as much as possible in real-time (including calibration and monitoring) • Two iterations: • FDR-1 (early 2008) participation at Nikhef in end-user analysis • FDR-2 (june 2008) participation at Nikhef planned for ‘production-style’ end-user analysis. Build on experience of FDR-1 exercise Atlas program - Stan Bentvelsen - SAC April 17, 2008

  23. Top physics at commissioning Top quark pair production at the LHC Cross-section ~ 800 pb(440 pb with a high-PTlepton)signal = 100 x Tevatron, bckg = 10 x Tevatron Nikhef interest in top physics: Early data challenges: - Commission ATLAS detector in multi-jet final states - Cross-section measurement Larger data sample: - Top quark properties (mass, charge, …) - Search for new physics (FCNC, SUSY, Mtt-resonances) t t Golden channel (l=e,μ)250,000 events/fb-1 Atlas program - Stan Bentvelsen - SAC April 17, 2008

  24. Top physics: determinationσ(tt) 2007/2008: ATLAS physics readiness rapports Include: Top cross-section, Top trigger, Top properties. 100 pb-1 ATLAS100 pb-1 ~ 500 events SuperSymmetry Mass 3-jet top candidate [ GeV] Mass 3-jet top candidate [ GeV] 2008: Early data: - Robust background estimates and calibrations (JES, trigger, ET-miss, fake leptons, b-tag) - Ambition: Nikhef will perform the first cross-section measurement Atlas program - Stan Bentvelsen - SAC April 17, 2008

  25. VBF: Higgs  W+W-  ll ATLAS TDR • VBF HWW: signifcant discovery potential over wide mass range • “No-lose” theorem applies to W-W scattering: • Something must show below mWW< 500 GeV/c2 to avoid unitarity violation. • Great synergy with Z and top reconstruction VBF H  WW Atlas program - Stan Bentvelsen - SAC April 17, 2008

  26. VBF Higgs: Characteristics Excellent properties for suppressing background: • Clean events: • color-coherence between initial and final state W-radiating quarks  suppressed hadronicactivity in central region • Tagging jets • Two forward, high-Pt jets • Spin zero Higgs: • charged leptons prefer to point in same direction. ATLAS CSC BOOK mH(true) = 170 GeV/c2 • Work focus: • Optimization of signal sensitivity w/ neuro-evolution • Setup and validation of 5-dimensional fit to extract Higgs candidates, based fully on bkg control samples. • background • signal + bkg Statisticalsignificance Transverse Higgs mass (GeV/c2) Atlas program - Stan Bentvelsen - SAC April 17, 2008

  27. Supersymmetry • We look for new physics beyond the Standard Model, in particular SUSY • Inclusively: 1 e or , at least four hard jets, significant ETmiss or multi-leptons plus jets • Excellent discovery potential already for 1 fb-1 • SUSY mass scales up to 1 TeV can be probed • Less sensitive to QCD background than search mode without leptons Various MSUGRA Benchmark points Dominating backgrounds: ttbar, W+jets Atlas program - Stan Bentvelsen - SAC April 17, 2008

  28. Susy: ‘Data driven’ bckgrndestimation • Crucial issue: • Understand SM background? • Solution: • Data-driven estimation of backgrounds in-situ • Many independent methods: • Nikhef method: combined fit in one-lepton search mode • Fit semi-leptonicttbar, fully leptonicttbar, and W+jets components • in distributions of ETmiss, MT, and “Mtop” • Sideband extrapolation to signal region •  Has been proven to work fine Atlas program - Stan Bentvelsen - SAC April 17, 2008

  29. dR High PT top reconstruction dR j2 b j1 • New physics in ttbar-like final states • SM ttbar production is a background • Anomalous top quark production as signal of new physics • resonances, stop quarks,… •  Effort on improving high-pT top quark production • Split overlapping jets: • “reverse” kt algorithm • y12 = scale of jet subcomponents before last merge t Atlas program - Stan Bentvelsen - SAC April 17, 2008

  30. First Atlas publication • Atlas detector paper • Complete description of ~420 pages Overview Magnet System Background radiation Inner Detector Calorimetry Muon Spectrometer Forward detectors Trigger & DAQ Integration & Installation Expected performance • Submitted to JINST 35 Countries 164 Institutions 1900 Scientific Authors total Atlas program - Stan Bentvelsen - SAC April 17, 2008

  31. Atlas-Nikhef interests: Replacement pixel b-layer ~ 2012, after 3 yrs of full lumi Complete rebuild of Inner Detector Around 2016 No more gaseous TRT Our ambitions: Pixel detector Involvement pixel b-layer Design Front End electronics GOSSIP to replace silicon sensors close to the IP (see R&D program) Silicon (short) strip tracker Design and production Cooling Implement C02cooling Lightweight structures SLHC upgrade: factor in 10 lumi Atlas program - Stan Bentvelsen - SAC April 17, 2008

  32. Conclusions • The ATLAS detector is fully in place • Routinely taking cosmics with most subsystems • Nikhef hardware responsibilities in good shape • Culminated in important knowledge on detector operation and performance • Challenging operation of ATLAS ahead • In situ calibration, alignment, background studies… • ‘Final dress rehearsal’ excellent preparation for physics • Detector shifts starting May 1st. Atlas program - Stan Bentvelsen - SAC April 17, 2008

  33. ATLAS is a lifestyle • T-shirts, baseball caps, pens, Newspaper, leaflets, YouTube movies, Atlas DVD’s, the Atlas book, posters, cards, etcetera Give us beam, and you will not be disappointed! Atlas program - Stan Bentvelsen - SAC April 17, 2008

  34. BACKUP Atlas program - Stan Bentvelsen - SAC April 17, 2008

  35. No Atlas without Nikhefexcellent technical & engineer support! Bedankt! Atlas program - Stan Bentvelsen - SAC April 17, 2008

  36. todo • Milestone runs introduceren • GRID • Computing/analyse models Atlas program - Stan Bentvelsen - SAC April 17, 2008

  37. Final remarks • The workload at CERN was high in the past year • Notably for technicians of the SCT and MDT • Planned to be permanently at CERN for a few months • In reality they were there more than year • Very committed, but demand was stretched to the limit • Technicians essential – we should show this more explicitly • LHC schedule • We know about the delays – • it has direct impact on the schedule of our PhD students for example • But the uncertainty on the schedule is sometimes frustrating • Last year we were surprised by the 2007 run of 900 GeV • CERN should be more clear about current 2007 schedule • Is 900 GeV run cancelled or not? Atlas program - Stan Bentvelsen - SAC April 17, 2008

  38. Atlas program - Stan Bentvelsen - SAC April 17, 2008

  39. ATLAS Collaboration 35 Countries 164 Institutions 1900 Scientific Authors total (1550 with a PhD, for M&O share) New application for CB decision on Friday: Göttingen, Germany New Expressions of Interest: Santiago (PUC)/ Valparaíso (UTFSM), Chile Bogotá (UAN), Colombia Albany, Alberta, NIKHEF Amsterdam, Ankara, LAPP Annecy, Argonne NL, Arizona, UT Arlington, Athens, NTU Athens, Baku, IFAE Barcelona, Belgrade, Bergen, Berkeley LBL and UC, HU Berlin, Bern, Birmingham, Bologna, Bonn, Boston, Brandeis, Bratislava/SAS Kosice, Brookhaven NL, Buenos Aires, Bucharest, Cambridge, Carleton, Casablanca/Rabat, CERN, Chinese Cluster, Chicago, Clermont-Ferrand, Columbia, NBI Copenhagen, Cosenza, AGH UST Cracow, IFJ PAN Cracow, DESY, Dortmund, TU Dresden, JINR Dubna, Duke, Frascati, Freiburg, Geneva, Genoa, Giessen, Glasgow, LPSC Grenoble, Technion Haifa, Hampton, Harvard, Heidelberg, Hiroshima, Hiroshima IT, Indiana, Innsbruck, Iowa SU, Irvine UC, Istanbul Bogazici, KEK, Kobe, Kyoto, Kyoto UE, Lancaster, UN La Plata, Lecce, Lisbon LIP, Liverpool, Ljubljana, QMW London, RHBNC London, UC London, Lund, UA Madrid, Mainz, Manchester, Mannheim, CPPM Marseille, Massachusetts, MIT, Melbourne, Michigan, Michigan SU, Milano, Minsk NAS, Minsk NCPHEP, Montreal, McGill Montreal, FIAN Moscow, ITEP Moscow, MEPhI Moscow, MSU Moscow, Munich LMU, MPI Munich, Nagasaki IAS, Nagoya, Naples, New Mexico, New York, Nijmegen, BINP Novosibirsk, Ohio SU, Okayama, Oklahoma, Oklahoma SU, Oregon, LAL Orsay, Osaka, Oslo, Oxford, Paris VI and VII, Pavia, Pennsylvania, Pisa, Pittsburgh, CAS Prague, CU Prague, TU Prague, IHEP Protvino, Regina, Ritsumeikan, UFRJ Rio de Janeiro, Rome I, Rome II, Rome III, Rutherford Appleton Laboratory, DAPNIA Saclay, Santa Cruz UC, Sheffield, Shinshu, Siegen, Simon Fraser Burnaby, SLAC, Southern Methodist Dallas, NPI Petersburg, Stockholm, KTH Stockholm, Stony Brook, Sydney, AS Taipei, Tbilisi, Tel Aviv, Thessaloniki, Tokyo ICEPP, Tokyo MU, Toronto, TRIUMF, Tsukuba, Tufts, Udine, Uppsala, Urbana UI, Valencia, UBC Vancouver, Victoria, Washington, Weizmann Rehovot, FH Wiener Neustadt, Wisconsin, Wuppertal, Yale, Yerevan Atlas program - Stan Bentvelsen - SAC April 17, 2008

  40. Muon systeem Atlas program - Stan Bentvelsen - SAC April 17, 2008

  41. Nikhef-Atlas group • Awards & external funding • VENI “World wide trigger “ Sander Klous • VIDI “Radiating Top Quarks”, Auke Pieter Colijn • VIDI “Fundamental Physics at 100 zeptometers” Ivo van Vulpen • VICI “Top physics; a new era in particle physics” SB • FOM project “Large extra dimensions”, Paul de Jong & SB • FOM project “Higgs or no Higgs at the LHC”, Ronald Kleiss & SB • FOM project “Search for supersymmetry” Nicolo de Groot • FOM project “Higgs asap” Sijbrand de Jong • FOM project “Higgs search at D0”, Sijbrand de Jong • Marie Curie fellowship, Sacha Caron • Rubicon subsistence, Max Baak • Age profile Atlas group: • 16 fte permanent staff • Geographic location • Amsterdam: FOM & UvA • 13 fte perm staff • Nijmegen: FOM & RU • 3 fte perm staff • Involvement in ATLAS management • Nigel Hessey – Upgrade coordinator • Kors Bos – Computing Operation coordinator • Paul de Jong - Publications committee • Stan Bentvelsen – Convener top physics group • Peter Kluit – Convener muon combined performance • Wouter Verkerke – Physics validation coordinator • Patrick Werneke – Technical coordinator SCT endcaps • Charles Timmermans – Convenor Graphics group • Stan Bentvelsen – Advisory committee CB • Olya Igonkina – Tau trigger convenor Atlas program - Stan Bentvelsen - SAC April 17, 2008

  42. Atlas program - Stan Bentvelsen - SAC April 17, 2008

  43. The beam vacuum pipe • Two from three sections are installed Installation of the ID beam pipe (with the Beryllium section) together with the Pixel package Connection of the ID section to the LAr EC beam pipe section Atlas program - Stan Bentvelsen - SAC April 17, 2008

  44. Common Computing Readiness • Common Computing at LHC • LHC operational: all 4 experiments will take data • Data rates and volumes to be handles at Tier1 and Tier2 is the sum of all experiments • This scale of operating needs to be prepared and planned • Set-up of Combined Challenge (aka CCRC) • Should be done in advance of data taking • Set of functional tests in February 2008 • Final challenge in May 2008 Atlas program - Stan Bentvelsen - SAC April 17, 2008

  45. Performance/analyse Permormance of the detector And blablabla Nicole Ruckstuhl Menelaos Tsiakiris Atlas program - Stan Bentvelsen - SAC April 17, 2008

  46. Technical support Atlas program - Stan Bentvelsen - SAC April 17, 2008

  47. ATLAS • ATLAS detector as combination of • Active detectors • Connectivity services (cables and pipes) • Support and access structures • Operation infrastructure • Cryogenics, cooling units, gas distribution, powerdistribution, ventilation … • Controls and safety systems • Front-end and back-end electronics • Data flow hardware and software Atlas program - Stan Bentvelsen - SAC April 17, 2008

  48. Today’s & 2008 activities • Completion of the detector installation • ~6000/7000 tons installed • Hardware commissioning • Electronic systems, controls, safety systems • ‘Milestone’ running periods • Full test of the data taking chain, mimicing ATLAS runs • Test of online and offline software and computing infrastructure Atlas program - Stan Bentvelsen - SAC April 17, 2008

  49. Atlas program - Stan Bentvelsen - SAC April 17, 2008

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