The Norwegian ALICE project 1998-2005Bergen University College
University of BergenUniversity of Oslo
The Norwegian Research Council
Project overview, Bergen, 19 October 2005Presented by B. Skaali, University of Oslo
Meeting Norwegian Research Council, Bergen, 19 October 2005 - ALICE Page 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
• R&D 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
Meeting Norwegian Research Council, Bergen, 19 October 2005 - ALICE Page 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
Meeting Norwegian Research Council, Bergen, 19 October 2005 - ALICE Page 4
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
LHCC ALICE Comprehensive Review V, March 7-8, 2005 V.Manko
ALICE-PHOSALICE-PHOS
5
• 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 γ and π0,
-signals of chiral-symmetry restoration.
Technical data: 17920 lead-tungstate crystals(PWO) -distance to IP 4400mm
-coverage in pseudorapidity -0.12;+0.12 -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
Electromagnetic Calorimeter PHOS.
PHOS (PHOton Spectrometer) is a high resolution electromagnetic calorimeter consisting of 17920 detection channels based on lead-tungstate crystals(PWO).
LHCC ALICE Comprehensive Review V, March 7-8, 2005 V.Manko
ALICE-PHOSALICE-PHOS
6
PHOS general structure
Modular structure 5 independent modules each of 3584 crystal detector units:PWO crystal+ APD+ preamp.
PHOS moduleWorking temperature: -25 oC
PHOS Cradle
Crystal detector unit
Strip unit of 16 detector units
LHCC ALICE Comprehensive Review V, March 7-8, 2005 V.Manko
ALICE-PHOSALICE-PHOS
7
PHOS module
• 3584 crystal detection units (6456)• Dimensions: 17341590757 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
LHCC ALICE Comprehensive Review V, March 7-8, 2005 V.Manko
ALICE-PHOSALICE-PHOS
8
2004 BEAM TEST results
2004 2003
(0)=4.7 MeV (0)=8.4 MeV
+ 12C 0 + X 2 + X
LHCC ALICE Comprehensive Review V, March 7-8, 2005 V.Manko
ALICE-PHOSALICE-PHOS
9
0 reconstruction in PHOS
mix
amix amix
0?
0!
(0)
Cen
tral
Pb-
Pb
coll
isio
ns, p
T=
1 G
eV/c Central Pb-Pb collision:
~ 100 reconstructed particlesof which ~ 50 identified as photons Mixed event method WA98
LHCC ALICE Comprehensive Review V, March 7-8, 2005 V.Manko
ALICE-PHOSALICE-PHOS
10
CSP‘s 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 CSP’s now delivered at CERN
The baseline design for this Charge Sensitive Preamplifier was developed in Bergen
2/2/2005 LHCC Status Report J. Schukraft11
Embedded FEE Embedded FEE electronicselectronics
FEE readout and TRU trigger cards are packed below “cold zone”
Both cards are mounted inside water-cooled cassettes
pipes for water cooling channel
2 * 1 6 P W O st rip u n its
A P D a n d p re a m plifie rs
-2 5 0 C
PWO Xtal strips @ -25 C
APD + CSP @ -25 C Total: 215 W
T-card
Intermediate PCB (IPCB)
Water cooling pipes
TRU Trigger card (L-0,L-1) Total 280 Watt
FEE card 32 ch. @ + 25 C Total 580 Watt (inside copper Envelope)
Electronics 1 PHOS module: 112*FEE / 8*TRU / 3584 CSP+APD
Total power: 1 kWatt
H. Muller, ALICE Forum 13 Oct ’05
2/2/2005 LHCC Status Report J. Schukraft12
FEE FEE cardscards
R&D CERN April-June 04Cadence Schematics: CERN June 0410 layer Layout & mounting : Wuhan
August/Sept 04 Prototypes in Testbeam: October 04
Evaluation: CERN Nov-Dec 04Revision: Jan 05
Review and final testing: Mai-Sept 05 130 card production Wuhan by end
2005
FEE card hardware properties• 32 ch. dual gain shapers = 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 (2*2 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
H. Muller, ALICE Forum 13 Oct ’05
2/2/2005 LHCC Status Report J. Schukraft13
Photo test Photo test setupsetup
GTL readout and control bus for 14 FEE cards
60 cm PCB strip, 40 cm cable
Readout Control Unit (RCU): bus master for 2*14 FEE cards
Connectors to CSP cables
Card spacing and height
exactly fits crystals2*16 Xtals per FEE card
Status: GTL bus production awaited from Norway
24 PHOS RCU’s tested by TPCone PHOS crate shipped to Wuhan
Front Connectors and cables all ordered
H. Muller, ALICE Forum 13 Oct ’05
LHCC ALICE Comprehensive Review V, March 7-8, 2005 V.Manko
ALICE-PHOSALICE-PHOS
14
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!
HLT Collaboration (19 Apr 2023) 15
High Level Trigger
L0L0L1L1L2L2HLTHLT
Dieter RoehrichUiB
• 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
Following HLT presentation by M. Richter
D. Swoboda
Oct 2005Oct 2005ALICE dipole magnetALICE dipole magnet
ALICE Magnet field mappingALICE Magnet field mapping
Muon Filter
Field mapping device
Meeting Norwegian Research Council, Bergen, 19 October 2005 - ALICE 17The PHOS cradle at CERN
Control assembly of the module in Moscow
PHOS
Meeting Norwegian Research Council, Bergen, 19 October 2005 - ALICE Page 18
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
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