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

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


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


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).



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



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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



8

2004 BEAM TEST results

2004 2003

(0)=4.7 MeV (0)=8.4 MeV

+ 12C 0 + X 2 + X



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



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


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



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




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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!

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


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

Documents

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