03/27/'07t. horaguchi @ isgc20071 computing grid for alice in japan hiroshima university takuma...
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03/27/'07 T. Horaguchi @ ISGC2007 1
Computing GRID for ALICE Computing GRID for ALICE in Japanin Japan
Hiroshima UniversityTakuma Horaguchi
for the ALICE [email protected]
03/27/’07 for ISGC2007
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OutlineOutline
Introduction LHC ALICE Experiment ALICE Offline Analysis
– Simulation data– Data Flow
Computing Grid @ Hiroshima University Current Status as a User Summary
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IntroductionIntroduction
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 !
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Large Hadron Collider (LHC)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 !
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ALICE ExperimentALICE Experiment ALICE
– A Large Ion Collision Experiment
Experiment for the Heavy Ion Collisions@LHC– Quark matter will be p
roduced, which is • High temperature • High density• Long life time
– Study of Quark-Gluon Plasma (QGP)
PHOS
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ALICE CollaborationALICE Collaboration
30 Countries, 96 Institutions, 1015 Members(in January, 2007)
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Photon Physics @ ALICEPhoton 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
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Photon Spectrometer (PHOS)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)
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ALICE Offline AnalysisALICE 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 !
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ALICE Offline AnalysisALICE Offline Analysis
Date Flow in ALICE
DAQ
CASTOR @ T0
T0
Buffer
CAF
T1
ESDT2
T2
ESD AOD
On lineAnalysis
First Reco 2-3 Reco
User Analysis
OfflineAnalysis
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Computing Grid @ HiroshimaComputing Grid @ Hiroshima For a User
– Users@Hiroshima University just have been able to submit their jobs !
For a Host– Machines just have been installe
d 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 thi
s April (after the ISGC2007 !)
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GRID ComputingGRID Computing
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GRID ComputingGRID Computing
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Current Status as a userCurrent Status as a user
Pi0 mass distribution– p+p 14TeV simulation d
ata• PYTHIA+GEANT+Reconst
ruction• 60K event analysis was fi
nished.
More detail analysis is processing with Computing Grid now !
pp minimum bias @ 14TeV
Pi0 mass peak
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SummarySummary
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 fram
ework 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 !
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First pp run conditionsFirst pp run conditions
√s (TeV) 0.9
L (cm-2s-1) 21028 - 2.6 1029 - 1.6 1030
t (s)1.7 105 (2 days)
8.6 105 (10 days)
1 PHOS module
= 0.24 × 20°
= 0.9 (assuming there is NO material in front of PHOS!)
A (pt)
pt < 10 GeV/c 10 GeV/c < pt < 100
GeV/c
(p0 + p1 pt)(1- e-(pt- p2)/ p
3 ) )
p0 = 0.042
p1 = 0.0013 c/GeV
p2 = 0.55 GeV/
p3 =1.25 GeV/c
p0 = 0.064
p1 = 0.0012 c/GeV
p2 = 14 GeV/
p3 =12 GeV/c
0,int Adp
dL
dp
dN
tt