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ATLAS: Report to the PRC

This report provides an update on the status of the Large Hadron Collider (LHC) and the ATLAS project, including news and projects at DESY. It also outlines the schedule and activities for the coming months.

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ATLAS: Report to the PRC

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  1. ATLAS:Report to the PRC M. Medinnis DESY Nov. 8, 2007

  2. Outline • LHC status • ATLAS status • ATLAS/DESY news • Status of ATLAS/DESY projects • Physics studies

  3. Updated LHC Schedule – 08.10.07 -- Lyn Evans Mar. Mar. 10 10 10 12 23 34 45 56 67 78 81 11 11 11 12 12 12 13 13 13 Apr. Apr. 14 14 14 15 15 15 16 16 16 17 17 17 May May 18 18 18 19 19 19 20 20 20 21 21 21 Jun. Jun. 22 22 22 23 23 23 24 24 24 25 25 25 26 26 26 Jul. Jul. 27 27 27 28 28 28 29 29 29 30 30 30 Aug. Aug. 31 31 31 32 32 32 33 33 33 2007 2007 34 34 34 Sep. Sep. 35 35 35 36 36 36 37 37 37 38 38 38 Consolidation 39 39 39 Oct. Oct. 40 40 40 41 41 41 42 42 42 43 43 43 Nov. Nov. 44 44 44 45 45 45 46 46 46 47 47 47 48 48 48 49 49 49 Dec. Dec. 50 50 50 51 51 51 52 52 52 . Jan. Jan. 01 01 01 02 02 02 03 03 03 04 04 04 05 05 05 Feb. Feb. 06 06 06 07 07 07 08 08 08 09 09 09 Mar. Mar. 10 10 10 11 11 11 12 12 12 13 13 13 Apr. Apr. 14 14 14 15 15 15 16 16 16 17 17 17 18 18 18 May May 19 19 19 20 20 20 21 21 21 Machine Checkout 22 22 22 Jun. Jun. 23 23 23 24 24 24 25 25 25 Beam Commissioning to 7 TeV 26 26 26 Jul. Jul. 27 27 27 28 28 28 2008 2008 29 29 29 30 30 30 31 31 31 Aug. Aug. 32 32 32 33 33 33 First luminosity run in July 34 34 34 35 35 35 Sep. Sep. 36 36 36 37 37 37 General schedule Baseline rev. 4.0 38 38 38 39 39 39 Oct. Oct. 40 40 40 41 41 41 42 42 42 Interconnection of the continuous cryostat 43 43 43 Global pressure test &Consolidation Warm up Global pressure test &Consolidation 44 44 44 Nov. Nov. 45 45 45 46 46 46 47 47 47 Leak tests of the last sub-sectors 48 48 48 Flushing Powering Tests Powering Tests Dec. Dec. 49 49 49 50 50 50 51 51 51 Inner Triplets repairs & interconnections 52 52 52 . Cool-down Cool-down

  4. From P. Jenni’s talk 8/10/07 The construction and assembly at the surface has reallycome to an end Shown here: integration of the JD shielding and the muon Small Wheels The installation in the cavern is also proceeding and nearing completion well along the planning of Technical Coordination

  5. Integration & Commissioning

  6. M5 Milestone Week Activities • Pixel DAQ integration successfully tested  now all but one subsystem (Muon CSC small wheels) has participated in common running. • L1 calorimeter trigger successfully integrated into L1 trigger (tiles only – difficult to see cosmic signal in LAr.) • Principle cosmic trigger from muon system: barrel and end-cap. • HLT included in the “standard” trigger (with full steering both with dummy and “real” algorithms). • Routine runs of > 100 kevents. • Trigger configured by the “Trigger Tool”. Enormous effort is going into the commissioning and integration of the system. Many problems and solutions found. No show stoppers uncovered. On track…

  7. DESY/ATLAS group • News: • Additional activities: ALFA, MC generator support. • Young investigator group of Philip Bechtle joined. • The group continues to grow, now: 13 dipl., 7 PhD students, 13 fellows, 11 staff, 1 J.Prof with Uni Hamburg (½). • Service tasks: • Trigger configuration • Trigger monitoring • Development of showering simulation algorithms • Technical maintenance of MC generator interfaces • Participation in construction & installation of ALFA • Distributed data management: exercising ATLAS grid tools (e.g. GANGA) & providing extensive user feedback

  8. Trigger Configuration • Functionality: • Online configuration of full trigger chain: • Integrated system for LVL1 and HLT • Distribution of settings to all clients • Trigger control (shift crew, experts) • Configuration of Trigger emulation in MC • Archival of trigger settings • Storage of trigger data (trigger bits) in events • Components: • Trigger Run Control, called “TriggerTool” • TriggerDB: relational DB • Software for • fast online distribution of settings • for storage and interpretation of trigger results in event data. • The DESY group is involved in evolving the design, coding & testing offline user shift crew expert TriggerTool DB population scripts TriggerDB compilers Configuration System R/O interface Online data taking Offline MC production Trigger Tool

  9. Front-end TriggerDB RODs LVL1/CTP L1Result LVL2 DbProxy Server/ rack Event Builder SFI (s) EF EF EF EF SFOs Streams Trigger Configuration II • Status: • First version with full functionality exists • Used in technical tests in the pit • “Large scale tests” • Technical runs • Cosmic runs (e.g. M5 week activities) • Fixing bits and pieces. • Next important steps: • Final dress rehearsal will use the system to configure the trigger settings. • Serious archival needed for the first time! • Move towards a production system. • Promotion of system to “offline” trigger developers (HLT), i.e. moving from an “expert tool” to a widely used system • Goal: full operation for 1st data.

  10. Online Monitoring Display A general purpose tool for visualizing info. from the online IS (Information Server)developed by DESY/Z student (S. Kama) • Includes GUI & histogram server/publisher components • Flexible, configurable on the fly • GUI show tables, bar charts, time-series graphs • Extensively used by online experts and shifters….

  11. Shower Simulation • Part of an ATLAS effort to speed up shower simulation. • “Frozen Showers” solution proposed by DESY group. • Originally developed and used by H1. • Follow electrons and photons with GEANT4 down to E = 1GeV, then deposit remaining energy using hits from library of “typical” showers generated in advance • Status: • Official validation samples are generally available. • Implement fix to energy offset problem (see plot) & validate by end ‘07. • Further fine tuning & developments for 1st half ’08.

  12. Generator Interfaces Group • Since October, DESY (+ 1 fellow from Gőttingen) is responsible for maintaining ATLAS interfaces to event generators. • Tasks: • Develop & maintain event generator interfaces ( 20 in use) + generator filter alogrithms. • RTT: run-time testing. Currently 7 test jobs of various generators are run nightly. Monitor output and extend tests to more generators. • Documenation: TWiki page for each generator, code documentation using (dOXygen) • In total,  35 packages • Short term plans: • Upgrade to LCG validated generator code (GENSER) where possible • Interface to Herwig++, Pythia8, Phojet, Cascade • Finish a major upgrade of documentation by 12/07 • On the longer term: physics validation of generators, manpower permitting • Presently 5 DESY physicists are involved

  13. The ALFA project Absolute Luminosity For ATLAS: to calibrate the LUCID detector move 1.5 mm to beam  measure interference region  σtot, b, ρ, L ± 3%

  14. DESY contributions to ALFA • Fiber detector metrology: measure position at 3 points of each fiber to 10 m • Multi-anode PMT acquisition & tests:check gains of all channels • Trigger tile readout: fibers, PMs, beam tests • Machining titanium fiber support plates DESY contributions are on schedule. Program for 2008: lab & beam tests of complete Roman Pot detector followed by installation. Construction of full system for installation in late 2008, early 2009.

  15. Outreach Activities T. Naumann, (ATLAS/DESY Zeuthen) is now chairman of GELOG (German Executive LHC Outreach Group) CERN visits of science journalists on Nov.06 + Aug.07, including press, TV, radio >30 journalists , and resulting in >40 articles in the German press (Support by DESY, MPI, CERN) “PPARC Model” www.teilchenphysik.org/journalisten.htm http://hausch.web.cern.ch/hausch/Visits/Wissenschafts-Pressekonferenz.html Similar but larger model to be built by DESY carpenters, firstly for LHC inauguration in ‘08, and will then be added to a traveling exhibition.

  16. Physics & Related Studies • SUSY • Derive electron trigger efficiency from data • Studies of two-electron final states • Studies of two-tau final states • Top physics • Optimize trigger thresholds for semi-leptonic and hadronic decay channels • Evaluate effect of possible missing-Et or sum-Et requirements • GFitter: A General fitting package (like ZFitter) of data from many sources to arbitrary theoretical models • Standard model: studies just beginning: • Z production, rapidity distribution (sensitive to PDFs) • W+ / W- production asymmetry • Goal: W mass measurement • Minimum bias • Develop track-based trigger for early running • Event structure studies

  17. Trigger Efficiency from Data Preparing to use data to understand the efficiency of the electron trigger Tag and Probe Method • Trigger on a single electron (e25i) • Offline, require 2 reconstructed electrons with Minv= MZ 20GeV • Define “Tag” electron (e25i) as one which satisfies trigger • Determine trigger efficiency with “Probe” electron Z-Signal L= 100 pb-1 Bkgd from jets Points: T+P method Histos from MC truth blue: after L1 green: after L2 grey: after EF To appear in the ATLAS detector reference paper

  18. Summary • The LHC and ATLAS are on track for a first luminosity run in July ’08. • The ATLAS/DESY group has grown substantially since the last PRC meeting. • New responsibilities have been taken on: • Event generator interface maintenance • Contributions to the ALFA forward detector • Debugging ATLAS grid tools • …and in addition we are preparing to analyze the data

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