The Norwegian ALICE project Bergen University College University of Bergen University of Oslo The Norwegian Research Council Project overview, Bergen, 19 October 2005 Presented by B. Skaali, University of Oslo

Meeting Norwegian Research Council, Bergen, 19 October 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 to 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 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 Now on par with ATLAS. –New member: Bergen University College

Meeting Norwegian Research Council, Bergen, 19 October ALICE Page 3 Funding and expenditures Total funding: 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 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

5 LHCC ALICE Comprehensive Review V, March 7-8, 2005 V.Manko 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 p T γ and π 0, -signals of chiral-symmetry restoration. Technical data: lead-tungstate crystals(PWO) -distance to IP 4400mm -coverage in pseudorapidity -0.12; coverage in azimuthal angle 100 o -crystal size 22x22x180 mm 3 -depth in radiation length 20 -modularity 5 modules -total area 8m 2 -total crystal weight 12.5 t -operating temperature -25 o C -photoreadout APD Electromagnetic Calorimeter PHOS. PHOS (PHOton Spectrometer) is a high resolution electromagnetic calorimeter consisting of detection channels based on lead-tungstate crystals(PWO).

6 LHCC ALICE Comprehensive Review V, March 7-8, 2005 V.Manko PHOS general structure Modular structure  5 independent modules each of 3584 crystal detector units: PWO crystal+ APD+ preamp. PHOS module Working temperature: -25 o C PHOS Cradle Crystal detector unit Strip unit of 16 detector units

7 LHCC ALICE Comprehensive Review V, March 7-8, 2005 V.Manko PHOS module 3584 crystal detection units (64  56) Dimensions: 1734  1590  757 mm 3 Total crystal area: 1.73 m 2 Total weight: 4.1 t The crystal detection units are kept at temperature of -25 o C  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

8 LHCC ALICE Comprehensive Review V, March 7-8, 2005 V.Manko 2004 BEAM TEST results  (  0 )=4.7 MeV  (  0 )=8.4 MeV   + 12 C   0 + X  2  + X

9 LHCC ALICE Comprehensive Review V, March 7-8, 2005 V.Manko  0 reconstruction in PHOS  mix a  mix  a  mix 0?0? 0!0! (0)(0) Central Pb-Pb collisions, p T =1 GeV/c  Central Pb-Pb collision: ~ 100 reconstructed particles of which ~ 50 identified as photons  Mixed event method  WA98

10 LHCC ALICE Comprehensive Review V, March 7-8, 2005 V.Manko CSP‘s for the 1 st 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. Schukraft 11 Embedded FEE electronics FEE readout and TRU trigger cards are packed below “cold zone” Both cards are mounted inside water-cooled cassettes PWO Xtal -25 C APD C Total: 215 W T-card Intermediate PCB (IPCB) Water cooling pipes TRU Trigger card (L-0,L-1) Total 280 Watt FEE card 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. Schukraft 12 FEE cards  R&D 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 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. Schukraft 13 Photo test setup 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 crystals 2*16 Xtals per FEE card Status: GTL bus production awaited from Norway 24 PHOS RCU’s tested by TPC one PHOS crate shipped to Wuhan Front Connectors and cables all ordered H. Muller, ALICE Forum 13 Oct ’05

14 LHCC ALICE Comprehensive Review V, March 7-8, 2005 V.Manko 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 (15-Sep-15) 15 High Level Trigger L0 L1 L2 HLT Dieter Roehrich UiB 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

ALICE dipole magnet D. Swoboda Oct 2005 ALICE Magnet field mapping Muon Filter Field mapping device

Meeting Norwegian Research Council, Bergen, 19 October ALICE 17 The PHOS cradle at CERN Control assembly of the module in Moscow PHOS

Meeting Norwegian Research Council, Bergen, 19 October 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