ALICE project at HIP: past, present and future

1
ALICE project at HIPpast, present and future

• Motivation
• 2) Brief history
• 3) T0 trigger detector
• 4) SSD module assembly
• 5) ALICE software development towards data
  analysis
• 6) Towards physics GRID, enhancing the physics
  group

Markku Oinonen at SAB / CERN, 24th of May 2005
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Motivation
QCD theory of strong interaction within
Standard Model predicts two transitions to
occur at approximately the same temperature or
pressure

• Phase transition between ordinary nuclear matter
  and Quark Gluon Plasma
• b) Chiral symmetry breaking related to
  generation of masses of composite particles
  (hadrons)

-deconfined -chiral symmetry restored
-confined -chiral symmetry broken
Focus soon on ALICE at LHC / CERN
Markku Oinonen at SAB / CERN, 24th of May 2005
3
Motivation / history
Pioneering work CERN Lead Beam Programme at SPS
(e 1 GeV/fm3) reports on creation of QGP (U.
Heinz and M. Jacob, arXivnucl-th/0002042 v1, 16
February 2000) PHENIX, STAR, PHOBOS, BRAHMS
experiments at RHIC (e 15 GeV/fm3) evaluations
on the proposed QGP signatures http//www.bnl.gov/
bnlweb/pubaf/pr/RHIC-peer.asp and references
therein
One (of many) area of interest high pT hadrons
carrying the history of partonic collisions
within the QGP medium ? access to QGP properties
Particularly at RHIC the predicted strong
suppression of high pT particles observed at
PHENIX for the first time (K. Adcox et al., PRL
91, 072301)
ALICE at LHC (e 1-1000 GeV/fm3) hard processes
contribute significantly to the total A-A cross
section (ALICE PPR Vol I, CERN/LHCC 2003-049, 7
November 2003)
Markku Oinonen at SAB / CERN, 24th of May 2005
4
Finnish ALICE history / 1

• 1 MCHF core
• 900 kCHF for SSD assembly
• 100 kCHF cash contribution

ALICE
TDR
Collaboration statistics
MoU

• at HIP
• part of Nuclear Matter Project of HIP (1998 -
  2001)
• project within Nuclear Matter Program (2002-)

TP
LoI
2001 daring decision SSD module assembly in the
Detector Laboratory of HIP instead of a
commercial company due to 3x price of a candidate
company!
Markku Oinonen at SAB / CERN, 24th of May 2005
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Finnish ALICE history / 2

• Daring, since
• Only premises available (Detector Laboratory)
• No equipment
• No personnel
• Such an operation against the ALICE MoUbut
  negotiable
• 900 kCHF to 700 kCHF not a small step
• ? allowing for 200 kCHF for starting RD and
  leadership of the T0 project

This mission impossible has now worked out!
Markku Oinonen at SAB / CERN, 24th of May 2005
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Resources making it possible

• Helsinki SSD module assembly
• Markku Oinonen, ALICE project leader, coordinator
  of the HIP Det. Lab.
• Henri Seppänen, PhD student
• Zoran Radivojevic, post-doc (part-time)
• Serja Nikkinen, MSc student

3 Ukrainian visiting scientists (16 visitors
altogether)
2) Jyväskylä T0 project and
software Wladyslav Trzaska, senior scientist, T0
project leadership Vladimir Lyapin, engineer,
T0 Mariana Bondila, PhD student, software
Core funding (in kCHFs)
HIP ALICE budget 183,5 kEUR for 2005
Markku Oinonen at SAB / CERN, 24th of May 2005
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T0 at ALICE
The ALICE T0 detector consists of 2 arrays of
photomultipliers equipped with Cherenkov
radiators.
2 x
Aim for Precise timing (lt 50 ps) Main L0
trigger Rough on-line vertex (1.5 cm) Pre-trigger
for TRD Provide backup for V0 and FMD Operation
in the magnetic field (0.5 T) High efficiency
laser calibration system, fast electronics,
DAQ towards the rest of the ALICE
HAS TO WORK ON DAY 1 OF THE ALICE ERA!
Markku Oinonen at SAB / CERN, 24th of May 2005
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Beamtests 2004
Four PMT tubes quartz radiators in-beam with
realistic cable lengths and electronics
Radiator diameters compared improved light
collection with smaller diameter
37 to 28 ps time resolutions achieved lowest
achieved for such detectors and lt 50 ps !
Markku Oinonen at SAB / CERN, 24th of May 2005
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T0 milestones
Markku Oinonen at SAB / CERN, 24th of May 2005
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Si strip detectors at ALICE ITS
ALICE ITS primary secondary vertices, track
identify low-pT particles, improve high-pT
particle resolution (traversing TPC)
strip
ALICE ITS
drift
2 pixel, 2 drift and 2 strip (SSD) detectors
layers, 1800 SSD modules with 2.6 ? 106 channels,
7.7 ? 106 bondings
pixel
Flexible interconnections based on Ukrainian Tape
Automated Bonding (TAB) technology
Markku Oinonen at SAB / CERN, 24th of May 2005
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SSD assembly in Helsinki
January 2002 start with an estimate of 250
modules with the decreased funding of 700 kCHF

• 2002-2004 preparing the factory
• working areas, conditions, Ukrainian expertise
• equipment (automatic bonding machine)

• June 2004 mass production
• Helsinki first among the three sites (Helsinki,
  Strasbourg, Trieste)

Up to May 2005 mass production and quality
control of the SSD modules with exemplary
quality aiming still to 1/3 of the assemblies
Markku Oinonen at SAB / CERN, 24th of May 2005
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Assembly phases 1 2
Markku Oinonen at SAB / CERN, 24th of May 2005
13
Assembly phases 3
?
2 defect rate accepted provided the components
are OK, this is standardly achievable (BUT AFTER
CAREFUL WORK!)
Markku Oinonen at SAB / CERN, 24th of May 2005
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Quality control of SSD assemblies
Careful bonding process tuning with pull tests
separately for chip, hybrid and sensor bonding
Scanning White-Light Interferometry in fast and
non-destructive bond quality control H. Seppänen
et al., Proc. of the SPIE International Symposium
Photonics North, September 27-29, 2004, Ottawa,
Canada to be published
Markku Oinonen at SAB / CERN, 24th of May 2005
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Beamtests (Oct 2004)
Combining all ITS subsubdetector modules SSD,
SDD, SPD in beamtests at CERN, operation as in ITS
2 Helsinki 2 Strasbourg modules, prototype
electronics, cabling, DAQ operation successful
ITS type of operation also successful SSD does
not make further beamtests
Markku Oinonen at SAB / CERN, 24th of May 2005
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Biasing of 73 HIP SSD modules (March -05)
acceptance limit
70 out of 73 acceptable 96 acceptable Last
28 100 acceptable
2 mA
?

Learning phase over assembly running OK!
Typical Ileak of a module
60 V
Markku Oinonen at SAB / CERN, 24th of May 2005
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Assembling status (Q 100 defected chs)

• Chips
• - aim 23 000 Q gt 98
• 38 assembled
• Hybrids
• aim 3800 Q gt 90
• 26 assembled
• Modules
• aim 1900 Q gt 70
• 15 assembled

Hybrids
Deadline Feb 2006 TIGHT!
Markku Oinonen at SAB / CERN, 24th of May 2005
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Software and analysis projects M. Bondila, (with
M. Ivanov, M. Kowalski, K. Safarik)
Software development in Jyväskylä for identifying
the strange particles emerging from QGP fireball
using kink decays observed in ALICE TPC
Algorithms being tested with MC in ALIROOT ?
encouraging results
Markku Oinonen at SAB / CERN, 24th of May 2005
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ALICE activity in Finland prospects for future

• Local building assembly projects will fade 2006
• integration, maintenance operation 2006 ?
• T0 operation responsibility
• Software Theory expertise continue to support
  the future activities

• New physicist position in mid-2005 / Jyväskylä
• Following the SAB recommendations
• Dr. Jan Rak / AuAu collisions with PHENIX at
  RHIC
• Previously high pT data analysis exploiting the
  RHIC Computing Facility
• ? Need for computing resources will increase we
  should establish reasonable resources for the new
  activity !

Markku Oinonen at SAB / CERN, 24th of May 2005
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Estimated ALICE computing needs

• CPU _at_ 2009
• 300 kSI2k
• Disk space _at_ 2009
• 170 TB
• Mass storage _at_ 2009
• 90 TB/year

Markku Oinonen at SAB / CERN, 24th of May 2005
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Nordic Data Grid Facility and ALICE computing
Nordic ATLAS community (Denmark, Norway, Sweden)
is planning to use the Nordic Data Grid Facility
(NDGF) as their distributed Tier-1 computing
facility

• ALICE plans
• Nordic ALICE community plans to follow Nordic
  ATLAS (similar needs Finland now included)
• Finnish ALICE needs included in the HIP
  initiative towards CSC
• Manpower most likely needed (computer scientist /
  physicist) 2006 ?

Markku Oinonen at SAB / CERN, 24th of May 2005
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Towards physics in the future
2005-2006 (and 2007) is a transition period to
turn he focus into data analysis and physics
Period characterized by 1) strong emphasis on
preparing the computing resources 2) shaping up
the HIP ALICE physics programme along with the
general ALICE one 3) finishing the highly
successful RD and construction tasks 4)
preparation for detector operation maintenance
Markku Oinonen at SAB / CERN, 24th of May 2005