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LHC Peter Jacobs 06/08/20091 LHC What is ALICE? Status of LHC ALICE readiness for beam ALICE EMCal...

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Size: 16 x 26 meters Weight: 10,000 tons Technologies:18 Tracking:7 PID:6 Calo.:5 Trigger, N ch :11 3P. Kuijer ALICE is the marriage of STAR and PHENIX → the comprehensive heavy ion experiment at the LHC

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LHC Peter Jacobs 06/08/20091 LHC What is ALICE? Status of LHC ALICE readiness for beam ALICE EMCal project 2The QGP comes of age Large Hadron Collider at CERN ALICE ATLAS CMS Size: 16 x 26 meters Weight: 10,000 tons Technologies:18 Tracking:7 PID:6 Calo.:5 Trigger, N ch :11 3P. Kuijer ALICE is the marriage of STAR and PHENIX the comprehensive heavy ion experiment at the LHC ALICE Collaboration ~ 1000 Members (63% from CERN MS) ~30 Countries ~100 Institutes ~ 150 MCHF capital cost (+ free magnet) A brief history of ALICE : Design : R&D : Construction : Installation > : Commissioning 4P. Kuijer US: 13 institutions, ~35 physicists LBNL ORNL LLNL Yale University Wayne State University . ALICE vs ATLAS/CMS LHC5 Requirements for heavy ion physics: goal is to measure large-scale collective phenomena: reconstruct complex hadronic events precise measurements of heavy flavor, photons, leptons energy scale 100 MeV 100 GeV robust tracking low material budget multiple detector technologies for particle ID Requirements for Higgs/SUSY searches: missing energy signatures: hermetic coverage energy scale 10 GeV 1 TeV tiny cross sections: high rate and rejection capabilities ALICE favors robust tracking, precision, and low mass over large acceptance, high rate, and huge dynamic range LHC Status LHC6 Slides from talk by J. Mans, University of Minnesota CIPANP San Diego May 09 LHC7 LHC8 LHC9 LHC10 The Incident of September 19, 2008 LHC11 LHC12 LHC Status CERN Director-General, February LHC13 The CERN Management today confirmed the restart schedule for the Large Hadron Collider resulting from the recommendations from the Chamonix workshop. The new schedule foresees first beams in the LHC at the end of September this year, with collisions following in late October. A short technical stop has also been foreseen over the Christmas period. The LHC will then run through to autumn next year, ensuring that the experiments have adequate data to carry out their first new physics analyses and have results to announce in The new schedule also permits the possible collisions of lead ions in 2010. LHC14 Expected running conditions at ALICE LHC GeV collisions First high E collisions Pilot run Expected duration~ shifts~ weeks~ months N P211 ( 2)24 (100 ns spacing) bunch P **m10 3 transverse bunch sizem luminositycm -2 s MB rates interaction rate per bc pile-up rate TeV p+p ALICE Commissioning Status LHC16 TRD SDD + SPD TOF ACO and TPC Cosmics in various subsystems Muon spectrometer TPC and TRD triggered by TRD L1 17P. Kuijer First interactions 11 th September Circulating beam 2: stray particle causing an interaction in the ITS ITS tracks on reconstructed tracks, common vertex 18P. Kuijer transverse momentum resolution, B=0.5 T resolution at 10 GeV First round alignment: measured 6.0% (design 4.5%) particle identification via dE/dx Resolution first round cal.: measured 5.7% (design 5.5%) TPC running continuously May- October M events (Cosmic, krypton, laser) recorded. Initial calibration, ExB and alignment performance approaching design values 19 P. Kuijer Alice preliminary TPC Calibration ALICE EMCal LHC20 The ALICE EMCal LHC21 Lead-Scintillator sampling calorimeter | |


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