PHENIX Computing Center in Japan [CCJ]
PHENIX Computing Center in Japan [CCJ]
A.Kiyomichi, T. Ichihara, Y. Watanabe, S. Yokkaichi, O. Jinnouchi, H. En’yo and Y.Goto (RIKEN, RBRC)

RIKEN CCJ Project• Regional computing center in Japan for BNL-RHIC experiment especially for PHENIX collaboration.
• CCJ serves for RHIC physics activity in Japanese and Asian scientists.
• Analysis of large scale data and simulation.
RIKEN-CCJ http://ccjsun.riken.go.jp/ccj/• CPU performance : 508 Pentium III/4 CPU (Total: 1,111 GHz)
• 252 (0.7~2.0GHz, CCJ) +256 (3.0GHz, RSCC) CPUs
• Use CPU resource of RIKEN Super Combined Cluster System (RSCC)• Disk Storage : 38 TB• Tape Storage: ~600 TB ( = 3,000 tapes, expandable to 1.2 PB)• HPSS (High Performance Storage System)PHENIX Experiment http://www.phenix.bnl.gov/• Collisions of polarized protons and heavy ions are deliveredat BNL-RHIC.
• Understand the spin structure of the proton through polarized
proton collisions.
• Search for quark gluon plasma, a state that existed at an
early stage after Big Bang.
Amount of DATA ~200TB/year

TAPE
MEDIALong Island, NY
NETWORK

Data transfer between RIKEN and BNL

RIKEN-CCJ
Wako,Japan• Send by air: ~20MB/s (=200GB*60tapes/week)• Use media tape (1tape=200GB, 1Case=60tape)• Network : ~10MB/s• For quick analysis
CPU Farms (332 CPU)
total 374 GHz

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Pentium
III

Linux PC Cluster(RIKEN-CCJ)

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SUN Fire 880
Data Server GB

12.0 TBFC RAIDSUN E450
Data Server

6.0 TBFC RAID

GB

SUN E450
Data Server GB

6.0 TBFC RAIDSUN E450
Data Server GB

5.7 TBFC RAID

Main Bldg.
2F

3.2 TBLVD RAIDSUN E450
Data Server GB

288 GBLVD RAIDSUN E450
Data Server GB

33.2 TB RAID

100BaseT x n

GigabitSwitchGigabit Switch
Catalyst 2948G
Privateaddress

Altacluster
control WS

CCJAMS
DB server

1000BaseSX

Disk Storage

AFS01
AFS server(New super computer)

Info. Blldg. 1F

RIKEN LAN
WAN

Firewalldrives

Switch1000
BaseSX

Tape Mover

HPSS
STK
HPSS TapeSTK Robot
RIKEN
superTape
SUN
computer
ACSLS
Robot

GigabitSwitchGigabitSwitch1000BaseSX
x 5 (9kB MTU)

1200 TB 6 x 9940B

Tape Storage

Relativistic Heavy Ion Collider
Brookhaven National Lab.

PHENIX event display
Au+Au s = 200GeV

Tape Mover
Disk Mover

GigabitSwitch     

Disk Mover
HPSS Server
3TB
RAID

8 TB Raid
HPSS Cache

HPSSController

IBM e-server(AIX 5.1)

PHENIX Experiment

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Study of the Proton Spin Structurewith polarized-proton collisions

Study of the Quark-Gluon Plasma
with heavy-ion collisions  Xeon
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Xeon 3GHz, 256 CPU
total 768 GHz

1000BaseSX

Initial state

Quark-Gluon Plasma
andhydrodynamical
expansion

Preequilibrium

Hadronization

Hadronic Phaseand freeze-outTime

Linux PC Cluster (RIKEN-RSCC)

In this schematic illustration two gold nuclei collide and give riseto thousands of quarks and gluons, which then equilibrate into a
hot cauldron of matter, the quark-gluon plasma. As this plasma
cools, it condenses into the ordinary particles seen by thedetectors.

In this schematic illustration two polarized
protons collide and obtain important data tounderstand the spin of the proton.

PHYSICS RESULTS
Hadronic Matter

The Cover of Physical Review Letters
Jet

High momentum quark

Jet
Measurement of the double helicity asymmetry ininclusiveid-rapidity neutral pion production forpolarized proton-proton collisions.his is the first of
a program to study the longitudinal spin structure of
the proton, using strongly interacting probes, atcollider energies. In perturbative QCD, ALL is directly
sensitive to the polarized gluon distribution functionin the proton through gluon-gluon and gluon-quark
sub-processes. The observed asymmetry is small
and consistent with a small gluon polarization.

Physical Review Letters 88, 022301 (2002)

Quark-Gluon Plasma

Plotted as a function of transverse momentum (pT ) is the ratio, RAA, of themeasured yield of charged and neutral pions in Au-Au collisions to the yieldthat would be expected based on an extrapolation of proton-proton collisions.
The PHENIX results and measurements taken at lower energies at the CERN
SPS are qualitatively different. At RHIC higher p T seems to be depleted,which was predicted assuming an energy loss of partons in dense matter.