The Search for the Quarkgluonplasma

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The Search for the Quark-gluon-plasma

• Two phases of strongly interacting matter
• Ordinary hadronic matter
• Quark-gluon-plasma
• Achievable in
• Big bang
• Neutron stars
• High energy nuclear reactions

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Pioneering High Energy Nuclear Interaction
eXperiment

• One of four detectors in the
• Relativistic Heavy Ion Collider
• International Collaboration
• Physics goals
• Study quark-gluon plasma
• Understand proton spin
• Subsystems to measure
• charged hadrons
• electrons
• photons
• muons

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11 Countries 51
Institutions 450
Collaborators 50-100M
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Data-intensive computing, both for real and
simulated events

• (Gold-gold collision, as seen in the central arm)

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The very detailed PHENIX Geant 3 model, run at
HPERC
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A vertical slice through the model (central arms
not shown)
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Two subsets of the tracks in a single central
Au-Au collision
About 10 of the barrel tracks
About 10 of the endcap tracks
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Details a zoomed-in look at a small part of the
endcap region
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One of PHENIXs Muon Arms
Muon ID system
Muon Magnet
Muon Tracking stations
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PHENIX Muon Arm Station 1 A UNM project
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PHENIX Muon Arm track reconstruction
Below accumulated real-data hits
Station 2
Station 1
Station 3
Above how a muon is reconstructed
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Muons Lots of Physics ? lots of computing
Over 100K SUs of simulations in the past year
200K more granted by NSF
Melting of the r
Deconfinement by J/y suppression
Chiral Symmetry Restoration shifting f mass
?
Thermal Production of Charm
Baseline with U
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Brookhaven / RHIC CERN /
LHC
EXPERIMENT.. PHENIX (Au-Au) ATLAS
(p-p) ALICE (Pb-Pb)
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Multi-Jet cross section (theory) calculations,
run using Condor/PVM
Three years of accumulated CPU time on desktop
(MOU) machines at HPCERC and at the University of
Wisconsin.
Very CPU-intensive calculations 6-
and 9-dimensional Monte Carlo integrations A
typical job runs for a week and produces only
about 100 KB of output histograms, such as those
displayed here.
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Future Plans (with new 200K SU NSF grant)...

• Move FROM
• PBS
• MPIRUN
• BBFTP for
• transfers

• TO a more Grid-like paradigm
• Condor-G
• Globus
• Condor Glide-ins
• Storage management with
• LBLs Hierarchical Storage
• Manager (HSM) or Condors
• Kangaroo prototype.
• GridFTP for transfers