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Introduction: Harvard ATLAS Group

Introduction: Harvard ATLAS Group. John Huth. Outline. Accelerator status and schedule Detector status and schedule Organization of Harvard ATLAS Group. An historic moment: Closure of the LHC beam pipe ring on 16 th June (the last piece was the one shown here in ATLAS side A).

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Introduction: Harvard ATLAS Group

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  1. Introduction: Harvard ATLAS Group John Huth John Huth Harvard DOE Review

  2. Outline • Accelerator status and schedule • Detector status and schedule • Organization of Harvard ATLAS Group John Huth Harvard DOE Review

  3. An historic moment: Closure of the LHC beam pipe ring on 16th June (the last piece was the one shown here in ATLAS side A) John Huth Harvard DOE Review

  4. Magnet cooldown status 11 Aug John Huth Harvard DOE Review

  5. Successful synchronization test of clockwise beam Injected for approx. 3 km Aug. 8 Counter-clockwise beams scheduled for 22 Aug John Huth Harvard DOE Review

  6. Accelerator Commissioning • Major milestones in ’08 • 10 TeV, L = 1E28 to 1E31 est • Clockwise injection 8 Aug. • Counterclockwise injection 22 Aug. • Circulating beams 10 Sept. • Colliding beams 20 October • Run till mid-Dec • Guess of integrated luminosity 1 pb-1 to tape John Huth Harvard DOE Review

  7. Luminosity determination in early running Ultimate accuracy estimated at 5% Source = W,Z cross sections Initial determination from beam parameters Van der Meer scans Instantaneous tracking in LUCID detectors (forward Cerenkov detectors) Estimate accuracy 15-20% John Huth Harvard DOE Review

  8. ATLAS Detector John Huth Harvard DOE Review

  9. Overall Status • Magnets working, functional to full field • Minor issues being worked on, solved • Shielding of LAr power supplies • Magnetic field mapping • Inner detector cooling • Trigger readout and timing • Should be ready with a functional detector for first collisions John Huth Harvard DOE Review

  10. Harvard ATLAS History • Joined 1995 • Responsible for MDT (Monitored Drift Tube) electronics design, production • Chamber construction site for endcap muon system • Development of computing model for LHC (Grids) • More recently • Muon subsystem installation, commissioning, operations, reconstruction • Physics simulation • Trigger development • Magnetic field mapping • Local computing cluster • Tier 2 facility (w/ BU) John Huth Harvard DOE Review

  11. ATLAS Muon Subsystem John Huth Harvard DOE Review

  12. Personnel • Faculty/Scientists • George Brandenburg (retired, consulting) • Melissa Franklin (transitioning from CDF) • Joao Guimaraes da Costa • John Huth • Masahiro Morii (transitioning from BaBar) • Postdoctoral scientists • Alberto Belloni • Kevin Black • Corinne Mills • Shulamit Moed John Huth Harvard DOE Review

  13. Personnel (con’t) • Graduate students • Lashkar Kashif (Zpt distribution) • Verena Martinez Outschoorn • Srivas Prasad • Ben Smith • Michael Kagan • Laura Jeanty • Chin Lin Wong • Giovanni Zevi Della Porta • Technical support • John Oliver (EE) • Sarah Harder (Tech) • Ned Henry (Tech) • Suvendra Dutta (sys-admin) • Steve Sansone (Tech) John Huth Harvard DOE Review

  14. ATLAS Positions • Kevin Black – Convener of inclusive lepton subgroup, Muon Commissioning Software Coordinator • Alberto Belloni – Muon DAQ Coordinator • Joao Guimares – Muon Management Group John Huth Harvard DOE Review

  15. Planned Activities in 09 • Muon subsystem commissioning and operations • Muon DAQ and online monitoring • Muon reconstruction software • Physics analysis (Z pt distribution, W’, Z’; top; BSM), participation in “Full Dress Rehearsal” (FDR) • Tier 2 Center w/ Boston U • Local computing cluster (4096 nodes, 1 PB disk) • High-level trigger core software • Magnetic field studies John Huth Harvard DOE Review

  16. Backup Slides John Huth Harvard DOE Review

  17. overall commissioning strategy for protons Stage A D B C No beam Beam • Pilot physics run • First collisions • 43 bunches, no crossing angle, no squeeze, moderate intensities • Displace bunches to optimise collisions in the 4 experiments • Push performance • Performance limit few 1031 cm-2 s-1 (event pileup) • 75ns operation • Establish multi-bunch operation, moderate intensities • Relaxed machine parameters (squeeze and crossing angle) • Push squeeze and crossing angle • Performance limit 1033 cm-2 s-1 (event pileup) • 25ns operation I • Nominal crossing angle • Push squeeze • Increase intensity to 50% nominal • Performance limit 2 1033 cm-2 s-1 • 25ns operation II • Push towards nominal performance John Huth Harvard DOE Review Courtesy Roger Bailey

  18. strategy for 2008 and 2009 2008 A No beam Beam 2009 B C No beam Beam John Huth Harvard DOE Review Courtesy Roger Bailey

  19. stage A: 5TeV collisions Approx 30 days of beam to establish first collisions Approx 2 months elapsed Given optimistic machine availability Un-squeezed Low intensity Continue commissioning thereafter Increased intensity Squeeze John Huth Harvard DOE Review Courtesy Roger Bailey

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