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Computing GRID for ALICE in Japan

Computing GRID for ALICE in Japan. Hiroshima University Takuma Horaguchi for the ALICE Collaboration takuma@hepl.hiroshima-u.ac.jp 03/27/’07 for ISGC2007. Outline. Introduction LHC ALICE Experiment ALICE Offline Analysis Simulation data Data Flow Computing Grid @ Hiroshima University

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Computing GRID for ALICE in Japan

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  1. Computing GRID for ALICE in Japan Hiroshima University Takuma Horaguchi for the ALICE Collaboration takuma@hepl.hiroshima-u.ac.jp 03/27/’07 for ISGC2007 T. Horaguchi @ ISGC2007

  2. Outline • Introduction • LHC • ALICE Experiment • ALICE Offline Analysis • Simulation data • Data Flow • Computing Grid @ Hiroshima University • Current Status as a User • Summary T. Horaguchi @ ISGC2007

  3. Introduction • Our purpose for using Grid Computing • Data analysis for the ALICE Experiment @ LHC for the study of the Quark-Gluon Plasma (QGP) • Our Goal for the Grid Computing • Join the Grid as a Tier2 and provide the CPU power for the ALICE Experiment (without a break !) • I will report the status of the computing Grid @ Hiroshima University in this presentation ! T. Horaguchi @ ISGC2007

  4. Large Hadron Collider (LHC) • p+p collisions • 14TeV • Pb+Pb collisions • 5.5TeV/A • The collision energy of LHC is much more than RHIC (0.2TeV/A) ! • Circumference length • 27km • The p+p collisions at 900GeV will be started from this November ! T. Horaguchi @ ISGC2007

  5. ALICE Experiment • ALICE • A Large Ion Collision Experiment • Experiment for the Heavy Ion Collisions@LHC • Quark matter will be produced, which is • High temperature • High density • Long life time • Study of Quark-Gluon Plasma (QGP) PHOS T. Horaguchi @ ISGC2007

  6. ALICE Collaboration 30 Countries, 96 Institutions, 1015 Members (in January, 2007) T. Horaguchi @ ISGC2007

  7. Photon Physics @ ALICE • Photon@ALICE • p+p collisions • Hadron decay • Prompt photon • Comparison with pQCD calculation • Gluon distribution function • Reference data for the heavy ion collisions • Pb+Pb collisions • Hadron decay • Prompt photon • Jet Quenching • Thermal Photon T. Horaguchi @ ISGC2007

  8. Photon Spectrometer (PHOS) • Photon Spectrometer • ElectroMagnetic Calorimeter • PbGO4 Crystal • APD readout • 5 moudules • 64×56 (1 moudule) • The installation will be started from this end of May ! (1 module) T. Horaguchi @ ISGC2007

  9. ALICE Offline Analysis • Simulation Data (December 2006) • pp 900GeV • PYTHIA (Event Generator) • Minimum Bias • 200K event • pp 14TeV • PYTHIA (Event Generator) • Minimum Bias • 20M event • Pb+Pb 5.5TeV will be generated near future • PYTHIA+GEANT+Reconstruction • Event Summary Data (ESD) • Analysis Object Data (AOD) • ALICE Grid (March 2007) • About 8000 node • Average availability : 46% • More than 2000 jobs are submitted in a day. • For Pb+Pb collisions, we need about 20000 node ! T. Horaguchi @ ISGC2007

  10. DAQ T0 CAF T1 T2 T2 ALICE Offline Analysis • Date Flow in ALICE ESD First Reco ESD 2-3 Reco AOD User Analysis On line Analysis Offline Analysis Buffer CASTOR @ T0 T. Horaguchi @ ISGC2007

  11. Computing Grid @ Hiroshima • For a User • Users@Hiroshima University just have been able to submit their jobs ! • For a Host • Machines just have been installed this middle of March ! • CPU • 38×2 (Intel Xeon 5160) • 3GHz • Storage • 42TByte • The machine power will increase in a few years ! • Plan • Install Grid Middleware • Setup ALICE analysis framework • This work will be started from this April (after the ISGC2007 !) T. Horaguchi @ ISGC2007

  12. GRID Computing T. Horaguchi @ ISGC2007

  13. GRID Computing T. Horaguchi @ ISGC2007

  14. Current Status as a user • Pi0 mass distribution • p+p 14TeV simulation data • PYTHIA+GEANT+Reconstruction • 60K event analysis was finished. • More detail analysis is processing with Computing Grid now ! pp minimum bias @ 14TeV Pi0 mass peak T. Horaguchi @ ISGC2007

  15. Summary • ALICE Experiment • The highest energy heavy ion collisions experiment with LHC • The p+p collisions at sqrt(s)=900GeV will be started from this November ! • Photon Physics in Heavy Ion Collisions • Photon Spectrometer • Installation of the computers @ Hiroshima University • The installation just have been finished in this middle of March • The installation of the Grid Middle ware & ALICE analysis framework will be started from this April. • Analysis for the ALICE simulation data with Grid • We just obtained the pi0 mass distribution of the simulation data with Grid. • More detail analysis is processing at Hiroshima University with Grid Computing ! T. Horaguchi @ ISGC2007

  16. First pp run conditions T. Horaguchi @ ISGC2007

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