The Norwegian ALICE project 1998-2005 Bergen University College University of Bergen University of Oslo The Norwegian Research Council

1
The Norwegian ALICE project 1998-2005Bergen
University CollegeUniversity of
BergenUniversity of OsloThe Norwegian Research
Council

• Project overview, Bergen, 19 October 2005
• Presented by B. Skaali, University of Oslo

2
Project baseline and development

• The project goals, timeline and funding were
  defined in 1998, with a fixed budget frame over 8
  years
• Since then
• Startup of LHC delayed by 3 years
• The initially foreseen DAQ activity changed to
  the HLT project
• The participation in HLT (High Level Trigger) has
  been very successfull
• The size of the planned five PHOS modules have
  shrunk from around 37000 to 18000 crystals, of
  which again only three modules may actually be
  constructed due to lack of funding
• The physics requirements for PHOS have evolved,
  requiring a re-thinking and redesign of the
  detector and the electronics
• RD period did not end in 2000-01 as planned!
  Furthermore, more responsibilities have fallen to
  Norway than originally assumed.
• The number of participating scientists and
  Master/Doctorate students is around twice that in
  1998. Now on par with ATLAS.
• New member Bergen University College

3
Funding and expenditures 1998-2005

• Total funding 21.470 Mkr ( adjustments for
  salary increases)
• CORE contribution 7700 kkr
• Personell expenses 3360 kkr
• Doctorate stipends 3670 kkr
• Running expenses 6740 kkr
• Added Cost-to-Completion 117 kCHF
• Accumulated overspending 2.5 Mkr
• ATLAS total funding for same period 42 Mkr, of
  which 23 Mkr CORE

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Norwegian responsibilities in ALICE

• Electromagnetic calorimeter PHOS
• CORE contribution 0.75 MCHF Cost-to-Completion
• Contributions physics simulations, electronics,
  data acquisition, data processing - PHOS in HLT
• High Level Trigger (HLT)
• CORE contribution 0.51 MCHF
• Contributions physics simulations, electronics,
  software/firmware for cluster finder and tracking
• Electronics and readout ? following
  presentation by Ullaland/Alme
• A very sucessfull collaboration with the ALICE
  Time Projection Chamber project for development
  of common electronics and system solutions for
  PHOS and HLT

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Electromagnetic Calorimeter PHOS.

• PHOS provides unique coverage of the following
  physics topics
• -study initial phase of the collision of
  heavy nuclei via direct single photons and
  diphotons,
• -jet-quenching as a probe of deconfinement,
  studied via high pT ? and p0,
• -signals of chiral-symmetry restoration.
• Technical data
• 17920 lead-tungstate
  crystals(PWO)
• -distance to IP
  4400mm
  
• -coverage in pseudorapidity
  -0.120.12
• -coverage in azimuthal angle 100o
• -crystal size
  22x22x180 mm3
• -depth in radiation length 20
  
• -modularity
  5 modules
• -total area
  8m2
• -total crystal weight
  12.5 t
• -operating temperature -25
  oC
• -photoreadout
  APD

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PHOS general structure
Crystal detector unit
PHOS module Working temperature -25 oC

• Modular structure
• 5 independent modules each of 3584 crystal
  detector units
• PWO crystal APD preamp.

Strip unit of 16 detector units
PHOS Cradle
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PHOS module

• 3584 crystal detection units (64?56)
• Dimensions 1734?1590?757 mm3
• Total crystal area 1.73 m2
• Total weight 4.1 t

• The crystal detection units are kept at
  temperature of -25oC
• thermo-insulating body
• cold volume ? crystal array
• warm volume ? FEE
• thermo-insulating shield between cold and
  warm volumes
• cooling beams and panels with channels for
  coolant in the cold volume
• tubes for water cooling in the warm volume

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2004 BEAM TEST results
?? 12C ? ?0 X ? 2? X
2004
2003
?(?0)8.4 MeV
?(?0)4.7 MeV
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?0 reconstruction in PHOS

• Central Pb-Pb collision
• 100 reconstructed particles
• of which 50 identified as photons
• Mixed event method
• ? WA98

gg
ggmix
p0?
Central Pb-Pb collisions, pT1 GeV/c
agg/ggmix
p0!
gg-aggmix
s(p0)
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CSPs for the 1st PHOS module from Japan

• discussed in July 04, based on the successful PS
  and SPS tests in 03
• sample evaluation in Sept/Oct 04 at CERN
• production started on 25 Oct. 04 in Japan
• 4,500 CSPs now delivered at CERN

The baseline design for this Charge Sensitive
Preamplifier was developed in Bergen
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Embedded FEE electronics

• FEE readout and TRU trigger cards are packed
  below cold zone
• Both cards are mounted inside water-cooled
  cassettes

PWO Xtal strips _at_ -25 C
APD CSP _at_ -25 C Total 215 W
T-card
Intermediate PCB (IPCB)
FEE card 32 ch. _at_ 25 C Total 580 Watt
(inside copper Envelope)
Water cooling pipes
TRU Trigger card (L-0,L-1) Total 280 Watt
Total power 1 kWatt
Electronics 1 PHOS module 112FEE / 8TRU /
3584 CSPAPD
H. Muller, ALICE Forum 13 Oct 05
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FEE cards

• FEE card hardware properties
• 32 ch. dual gain shapers t 1 or 2us
• RMS noise 2 us 615 e- ( 3.1 MeV)
• 14 bit dyn range 5 MeV 80 GeV
• 32 APD bias regulators -0.1V
• Fast OR (22 Xtals) for trigger
• Board controller FPGA (PCM)
• USB controller
• TPC-like readout and control bus
• DAQ and DCS via RCU
• 5.5 Watt, 349 210 mm2

• RD CERN April-June 04
• Cadence Schematics CERN June 04
• 10 layer Layout mounting Wuhan August/Sept
  04
• Prototypes in Testbeam October 04
• Evaluation CERN Nov-Dec 04
• Revision Jan 05
• Review and final testing Mai-Sept 05
• 130 card production Wuhan by end 2005

H. Muller, ALICE Forum 13 Oct 05
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Photo test setup
Status GTL bus production awaited from
Norway 24 PHOS RCUs tested by TPC one PHOS
crate shipped to Wuhan Front Connectors and
cables all ordered
Connectors to CSP cables
Readout Control Unit (RCU) bus master for 214
FEE cards
GTL readout and control bus for 14 FEE cards 60
cm PCB strip, 40 cm cable
Card spacing and height exactly fits
crystals 216 Xtals per FEE card
H. Muller, ALICE Forum 13 Oct 05
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PHOS - Participating institutes

• - CERN
• - China, Beijing, China Institute of Atomic
  Energy
• - China, Wuhan, Central China Normal University
  (CCNU)
• - China, Wuhan, Huazhong University for
  Science and Technology (HUST)
• - Czech Republic, Prague, Academy of Science of
  the Czech Republic, Institute of Physics
• - Germany, Münster, Westfälische Wilhelms
  Universität, Institute für Kernphysik
• - France, Nantes, Laboratoire de Physique
  Subatomic et des Technologies Associées
• - Japan, Hiroshima, Hiroshima University
• - Norway, Bergen, University of Bergen,
  Department of Physics
• - Norway, Oslo, University of Oslo, Department
  of Physics
• - Poland, Warsaw, Soltan Institute for Nuclear
  Studies
• - Russia, Moscow, Russian Research Center
  Kurchatov Institute
• - Russia, Protvino, Institute for High Energy
  Physics
• - Russia, Sarov, Russian Federal Nuclear Center
  VNIIEF
• - Russia, Dubna, Joint Institute for Nuclear
  Research

However, the PHOS detector is still only
partially funded in 2005!
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High Level Trigger
Following HLT presentation by M. Richter

• Trigger
• Accept/reject events
• Select
• Select regions of interest within an event
• Compress
• Reduce the amount of data required to encode the
  event as far as possible without loosing physics
  information
• Provide HLT-ESDs for online monitoring
• Access to the results of the event reconstruction

• Physics Applications
• Online
• Architecture
• Communication Framework
• Interfaces
• Prototypes
• Milestones

Dieter Roehrich UiB
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ALICE Magnet field mapping
Muon Filter
Field mapping device
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PHOS
Control assembly of the module in Moscow
The PHOS cradle at CERN
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Status on the eve on the next period

• The Norwegian contribution to ALICE is
  significant and visible
• The ALICE project, together with the parallell
  Heavy Ion experimental programme (BRAHMS), have
  given the High Energy Nuclear Physics in Norway a
  strong momentum, both in terms of physics and
  detector instrumentation