Transcript ALICE Analysis Status @ Tsukuba ~GRID/CAF Practice~

Univ. of Tsukuba & JSPS
T. Horaguchi
Jan. 21 2010 for the ALICE Analysis Workshop
ALICE Analysis Workshop @ Hirosima Univ.
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 Status
@ Tsukuba Group
 Analysis Facility @ Tsukuba
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Network @ Tsukuba
Tsukuba Cluster
 Analysis
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Status & Plan
Single & Di-Jet
Photon (pi0 & Direct photon via internal conv.)
Soft Physics (Mean pT & Accumulative Corr.)
 Summary
& Future Plan
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Contribution to ALICE
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ALICE Detector
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ALICE Analysis
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Di-Jet Calorimeter
 Construction
 Simulation
 Calibration
 Physics Analysis
TRD
 DCS Work
EMCAL
 HLT, Calibration
Direct Photon via Internal Conversion Measurement
Single & Di-Jet Measurement
Mean pT, Accumulative Correlation
Event Display with AliEVE
So, we needed more machine power locally, but we
succeeded to establish our computing facility ! (See next
slides)
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ALICE Analysis Workshop @ Hirosima Univ.
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Tsukuba Cluster
Established Local Cluster in early April in last year
 Established private network, gave private IP address instead of global IP
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Hep-net (See Next Slide)
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Plan for Data Transfer
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Several hundreds GByte will be transferred with starting LHC-ALICE
How many times we have a meeting with abroad in months ?
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One GateWay in global has the private PCs and Worker Nodes in private IP
space for security reason
About 5 or 6 times
Security for our Network
All private PCs and Worker Nodes are in private, except GateWay
 Restricted password access to Gateway, adopted public key access for
security reason
 Only the access from major Institutes and member’s home are permitted
access to GataWay using ssh
 VPN will be adopted our network near the future
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Hep-net
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Private Network
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GateWay
Private
Network
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Local
Cluster
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Local Cluster(16 nodes)
Private PC（～15nodes）
Local Cluster
PHENIX / ALICE
 CPU (144core)
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Local
Disk
Local
Disk
Xeon E5345 2.33GHz
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PC
7node x 2cpu x 4core
Memory / core ~ 1GByte
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Xeon E5310 1.60 GHz
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7node x 2cpu x 4core
Memory / core ~ 1GByte
Xeon E5540 2.53 GHz
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2node x 2cpu x 8core
 Memory / core ~ 1.5GByte
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WN
PC
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Storage Server
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PC
Condor
Server
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OS
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Disk
Server
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RAID :12TByte
Local : ~8TByte
Total : ~ 20TByte
Scientific Linux 4.5 & 5.3
All WN will be updated to SLC5
Batch Job System
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Condor
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ALICE Data Analysis
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AliRoot Installation
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ALICE Data
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V4-16-Rev-03
V4-17-01
V4-17-Rev-20 (for pass1)
V4-17-Rev-22 (for pass1)
V4-17-Rev-23 (for pass2 only Calorimeter)
V4-17-Rev-24 (for pass2)
First Year pass1 data (all root_archive)
First Year pass2 data (Calorimeter only)
First Year pass2 data (ESD only)
Physics Simulation & Analysis
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Simulation for Di-Jet Calorimeter in event generator level
 PYTHIA
 PQUEAN
 QPYTIHA (1sec / event)
 HIJING
Simulation for Di-Jet Calorimeter in GEANT level
 Waiting for Wuhan’s contribution
Data Transfer with AliEn
 0.2 MByte / sec with gridftp
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1
Staff & 5 Students are
working
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Staff
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T. Horaguchi
Student
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K. Watanabe
D. Sakata
M. Sano
H. Yokoyama
Y. Watanabe
5
students are expert & super
heavy user of our cluster !
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Member
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Y. Miake
S. Esumi
T. Chujo
M. Inaba
M. Shimomura
T. Horaguchi
M. Sano
D. Sakata
H. Yokoyama
S. Kubota
Y. Kondo
Y. Watanabe
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 in
PHOS/J-cal
0 in
PHOS/J-cal
Recoil Di-jet ETjet1>70GeV
EM-cal
EM-cal
Recoil -jet ET>30GeV
Recoil 0-jet ET0>30GeV
jet (R<0.3)
in J-cal
EM-cal
ALICE Analysis Workshop @ Hirosima Univ.
M. Sano,
H. Yokoyama,
Grad. Student of Tsukuba
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Improvement in jet energy resolution !
M. Sano,
H. Yokoyama,
Grad. Student of Tsukuba
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Member
T. Horaguchi
 D. Sakata
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Joined Jet Working
Group in PWG4
 Presentation
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2 times @ PWG4
Using Tsukuba Cluster
 Focused to study Jet
Finding Algorithm now,
but we also has started
the analysis of pp
900GeV data !
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FastJet: sequential clustering algorithms
http://www.lpthe.jussieu.fr/~salam/fastjet
p  1 k algorithm
T

2p
2 p R
dij  min(kti ,ktj ) 2 p  0 Cambridge/Aachen algorithm
R 
p  1 anti-kT algorithm
Algorithm
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Calculate particle distance : dij
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Calculate Beam distance : diB=kti2p
Find the smallest distance (dij or diB)
If dij is the smallest combine particles
If diB is the smallest and the cluster
momentum lager than threshold call the
cluster a Jet.
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KT jet Cone jet
Parameters
- R size
- pT cut
- Jet threshold
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arXiv:0802.1189v2
[hep-pn] (2008)
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We analyze for closest Jet to parton
Δφ , Δη= parton axis – jet axis
This work has been done by D. Sakata & T.
Horaguchi.
Δϕ resolution
Δη resolution
pThard
100GeV/c
Jet threshold 20GeV/c
measured energy
Resolution : σ of sharp gaussian
kT algorithm
anti-kT algorithm
Cambridge algorithm
ALICE Analysis Workshop @ Hirosima Univ.
Performance of energy reconstruction of Jet
with anti-kT algorithm is about 50%
better than kT algorithm!
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Member
K. Watanabe
 T. Horaguchi
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Presentation
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PWG2(2010 Jan. 12)
Physics Motivation
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Study of soft & hard
physics in pp collisions
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Mean pT
Accumulative Correlation
Using Tsukuba Cluster, but
just preparing to join the
PWG2 Train now.
PWG2’s suggested to us,
we had better to join First
Physics group for study of
mean pT & Multiplicity…
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Direct Photon via Internal
Conversion
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T. Horaguchi
K. Watanabe
Using Hiroshima Cluster & GSI
cluster & Tsukuba Cluster
 Several presentations in PWG4
 Preparation to join PWG4 mini
train is ongoing
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Pi0 Analysis with EMCAL
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T. Horaguchi
M. Sano
This analysis has just started
now !
 Photon analysis is also
important for Di-Jet
Calorimeter analysis.
 Joined calorimeter analysis
group.
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Established Tsukuba Cluster
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For Di-Jet Calorimeter
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For Local Data Analysis
Started First Data Analysis @ Tsukuba
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Several analysis has just started in parallel !
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A lot of Simulation works done, and will continue
We are very welcome to use Tsukuba Cluster by D-Cal
collaborator. Please notify us if you want !
Almost analysis is doing @ Tsukuba Cluster
Preparation to join the PWG’s Train is ongoing
In this time, we do not use CAF
However, we will move to using GRID analysis to
analyze high luminosity data in 7TeV pp and
10TeV pp run as soon as possible !
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EMCal module
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Extension of ALICE-EMCal; same design,
same material, same electronics.
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Lead-Scintillator sandwich type sampling
EMCal (77 layers), APD readout with WLS.
(ΔΦ,Δη) ~ (0.025,0.025)
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,Jet,0 - hadron
correlation
RHIC-AGS’09, Y. S. Lai
Comparisons are
the most important!
STAR Preliminary
Au+Au 0~10%
QM09, M. Ploskon
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ALICE EMCAL
eta view of ALICE & J-CAL
J-Cal
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In φ, on opposite side of EMCAL
In η, next to the PHOS
6 SMs in total.
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5
JCal – 6 super
modules
h~0.7
4
3
2
PHOS – 5 modules shown
B6 Configuration was chosen to have a largest possible
jet radii in J-Cal
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