ALICE Si-FMD,T0,V0 25/11 2002Jens Jørgen Gaardhøje, NBI, [email protected] Forward detector...

25/11 2002

Jens Jørgen Gaardhøje, NBI, [email protected] 1

ALICE Si-FMD,T0,V0Forward detector overview

Si-FMD (Forward Multiplicity Detector) NBI+INRo Si-strip Ring counters (5) with >50.000 channels o -5.1< < -1.7; 1.7< < 3.4o Precise off-line charged particle multiplicity for A+A, p+p o Fluctuations event-by-event, flow analysis

T0 (Beam-Beam Detector) Jyvæskyla + MEPhI, INR, Budker, Kurchatov

o 2 arrays of 12 Cerenkov radiators + PM tubeso -5< < -4.5; 2.9< < 3.3o Fast timing LVL0 signal (=50ps), online vertex determinationo Main time reference and backup for MinBias trigger

V0 (Centrality and collision vertex) Lyon+Mexicoo 2 arrays of plastic scintillator tiles w. fiber+PMTo -5.1< < -2.5; 1.7< < 3.8o Main LVL0 MinBias for p+p and A+A and centrality trigger A+Ao Background rejection

25/11 2002


ALICE Si-FMD,T0,V0Forward detectors

T0R 2.9 < || < 3.3

T0 for the TOF (< 50 ps time res.) Two arrays of 12 quartz counters. Also backup to V0

SI-FMD Multiplicity and dn/d 1.7 < < 3.4 and -5.1 < < -1.7 Silicon pad detector disks (slow readout)

V0 1.7 < |< 3.8 and –5.1 < | | < -2.5

Interaction trigger, centrality trigger and beam-gas rejection. Two arrays of 72 scintillator tiles readout via fibers

T0L

PMD pre-shower det.

25/11 2002


ALICE Si-FMD,T0,V0Integration in ALICE

Si-1Si-2

Si-3

V0-R

T0-R

25/11 2002


ALICE Si-FMD,T0,V0FWD detectors

25/11 2002


ALICE Si-FMD,T0,V0CERN Maquette 1:1

Si1 (inner)Si1(outer)

V0-R T0-R

Absorber

ITS-pixels

25/11 2002


ALICE Si-FMD,T0,V0Si-FMD Overall Geometry

-5.1< <-1.7 3.4 < < 1.7

Si3 Si2Si1

25/11 2002


ALICE Si-FMD,T0,V0Si rings

manufactured of 6” wafers

256

Inner:

Rin=4.2 cm

Rout=17.2 cm

Outer:

Rin=15.4 cm

Rout=28.4 cm

10x2x256=5120

20x2x128=5120

128

25/11 2002


ALICE Si-FMD,T0,V0Coverage in pseudorapidity

Constraints:

Vacuum tube outer envelope: 42 mm,

Outer radius, ITS, Absorber, cables

Background from secondaries(small angles)

Design criteria:

Largest possible coverage

Largest symmetry left and right

Overlap between systems

Si1:

Out: 1.70< <2.29 In: 2.01< <3.40

Si2:

Out: -2.29<<-1.7 In: -3.68< <-2.28

Si3:

In: -5.09< <-3.68

Vertex shift (10cm): |d| 0.1

25/11 2002


ALICE Si-FMD,T0,V0Charged particle

occupancy including secondaries

20 sectors

256 strips each

5120 channels

20 sectors

256 strips each

5120 channels

40 sectors

128 strips each

5120 channelsMay increase number of strips by factor of 2 or 3 using ’128 ch VA-prime’

PA chip at same cost !

25/11 2002


ALICE Si-FMD,T0,V0Multiplicity resolution

25/11 2002


ALICE Si-FMD,T0,V0Hybrid with Viking PA chips

VA preamp+shaper: 128 ch

Connector(s) forpower, control, read-out

Other components

Other components

Hybrid cards contain: FE–Preampl. chips Bias voltages distribution Gate/strobe distribution Read-out clock distribution Detector bias connection

Si detector

25/11 2002


ALICE Si-FMD,T0,V0Front end electronics

REQUIREMENTS: Adapted for 5-25pF

capacitance(300m Si, 0.5 cm2: 25pF,

1MIP: 22.400 e-)Dynamic range: 0-20 MIPSRadiation hardness:

>200kRadPeaking time: 1-2 sLow noise (good S/N)High integrationSample/hold and serial read-

out, 10 MHz clockModerate power consumptionSimple slow controls and

power reg.Affordable cost

VA1 prime 2 (Viking-IDEAS):Input capacitance: < 30 pF

0-20 MIPs>1MRad (0.35 m tech.)1-3 s475 e- at 25 pF => S/N 20:112810 Mhz clock

1.3 mW/chTest system available

OK

25/11 2002


ALICE Si-FMD,T0,V0FMD RO strategy

FMD Segment

ON DETECTOR

Digital serial links

(15-20 m)

Digital serial links

(15-20 m)

Trigger & Slow Ctrl

Trigger & Slow Ctrl

IN CAVERN INCOUNTING

ROOM

Slow control& Trigger

Slow control& Trigger

Detector Data Link(50-60 m)

Detector Data Link(50-60 m)

FMD RCU

VA

1 ring: 10/20 segments 2 Digitizers 1 RCU per side 1 DDL per sideFull FMD: 70 segments 10 Digitizers 2 RCU’s 2 DDL’s

FMD Read-Out and Control Electronics

Analog serial link(10 MHz) 0.5 m

Analog serial link(10 MHz) 0.5 m

VA read-outcontrol

VA read-outcontrol

Loc

al

Con

trol

ler

DD

L - IN

TSlow

-Control

Interface

TTC-RX

BOARDCTRL

Datareceiver

FMD Digitizer

ALTROALTRO

ALTROALTRO

ALTROALTRO

CTRLCTRL

Read-out CTRLRead-out CTRL

CTRLCTRL

CTRLCTRL

BSN, 21 Nov 2002

25/11 2002


ALICE Si-FMD,T0,V0FMD FEE test setup

BSN, 21 Nov 2002

FMD FEE test

CTRLCTRL

PowerBiasesPowerBiases

Clock10 MHzClock10 MHz

Trig in

ALTRO tester

ALTROALTRO

CTRLCTRL

Ext clock

Ext trigger

Sidetector

VA

Labview

DAQ

25/11 2002


ALICE Si-FMD,T0,V0Si-FMD timetable (1)

A FRONT END (FE) READ OUT ELECTRONICS Completed

1 Demonstrate functionality of conceptual layout of FEE(Viking PA chip, control system, interface to ALTRO test board)

April 1 2003

2 Final choice of VA pre-ampl. chip. RO test June 1, 2003

3 Test FEE system coupled to sample Si detector. Source and electron beam tests.

June 1, 2003

4 Design, construction and test of prototype FMD digitizer card (FMDD), RO test with ’mini’ FMD-RCU

October 1, 2003

5 Full Si detector element + electronics chain RO with realistic RCU and DDL link to DAQ.

June 1 , 2004

B MECHANICS AND INTEGRATION Completed

1 Full scale model manufactured (Si1) February 1, 2003

2 Cabling and Cooling issues resolved April 1, 2003

3 Full integration sequence decided June 1, 2003

25/11 2002


ALICE Si-FMD,T0,V0Si-FMD timetable (2)

C. SILICON DETECTOR Completed by

1 Complete market survey February 1, 2003

2 Define final specs March 1, 2003

3 Place order for prototype with industry April 1, 2003

4 Delivery Si-wafer prototype June 1, 2003

5 Start production of Si-hybrid FEE card June 1, 2003

6 Delivery prototype hybrid August 1, 2003

7 Si prototype test with FEE and BEE test RO setup December 1, 2003

8 Place final order for Si with industry April1, 2004

25/11 2002


ALICE Si-FMD,T0,V0V0 detector

Two segmented scintillator hodoscopes on either side of IP

• Minimum bias trigger: p-p and Pb-Pb

• Main on-line LVL0 centrality trigger: Pb-Pb

• Background filter for the dimuon spectrometer

• Two arm for beam-gas rejection

• Luminosity control• Multiplicity

measurement (high occupancy)

V0-R

Absorber

25/11 2002


ALICE Si-FMD,T0,V0V0 Segmentation

V0-L and V0-R: 5 rings each

Rings 1-4: 30° sectors (12) Ring 5: 15° sectors (24)

Rings 1-3 are in the dimuon arm acceptance

Ring

V0L V0R

ηmax/ηmin max/min ηmax/ηmin max/min

1-5.1/-4.6

-0.7/-1.2

3.8/3.4 2.6/3.8

2 -4.6/4.2-1.2/-1.7

3.4/2.9 3.8/6.3

3-4.2/-3.7

-1.7/-2.8

2.9/2.5 6.3/9.4

4-3.7/-3.2

-2.8/-4.7

2.5/2.1 9.4/14.0

5-3.2/-2.8

-4.7/-7.0

2.1/1.7 14.0/20.7

25/11 2002


ALICE Si-FMD,T0,V0V0 Ligth collection test

For 1 MIP: Setup A: light yield: 12 p.e. ; time resolution (): 1.6 ns Setup B Light yield: 33 p.e.; time resolution(): 1.2 ns

25/11 2002


ALICE Si-FMD,T0,V0V0 Triggering

LVL 0 triggering with fast electronics (25 ns)

Dynamic range: 1- 300 MIP’s

1 MIP efficiency > 97% Three trigger signals to the

CTP corresponding to 3 sum energy levels:

Low:MB for pp and Pb-Pb (low)

High: central and Medium: semi-central Pb-

Pb Simulations: AliRoot w/ PYTHIA 6.15 in pp at 7 TeVL and R single efficiencies: 85%L*R : 79%Eff. of Inelastic component: 100%HIJING in Pb-Pb at 5.5 ATeV (to be explored)

25/11 2002


ALICE Si-FMD,T0,V0V0 Timetable

Construction in 2004/2005V0L by MexicoV0R by LyonElectronics by Lyon

Final system Commissionning → middle 2005

Ongoing work

•Light optimization → geometry of the counter/fiber elements with beam tests -> end 2002 (OK)

•Electronics specification ongoing,

•PM test and choice in Lyon

Tests of full quadrant w. Beam

-> end 2003 (delayed from october 2002)

25/11 2002


ALICE Si-FMD,T0,V0T0 Beam-Beam counter

Precise event timing (=50ps)

Start detector for ALICE-TOF

Main LVL0 event trigger Pre-trigger for TRD Rough on-line vertex

determination <1.5 cm Beam-gas suppression

Output Signals: T0 = (tr+tl)/2+td

T0v = tr-tl

T0-L, T0-R, Coinc Time and energies 3 levels of sum energy

(low, medium, high)

25/11 2002


ALICE Si-FMD,T0,V0T0 Full scale model

25/11 2002


ALICE Si-FMD,T0,V0T0 elements and beam test

PM tubes: fine mesh Hamamatsu R3432-01 (26

mm Ø) or FEU-187 (30 mm Ø)

30 mm thick radiator (Lucite)

Time resolution with broad 1.28GeV/c pion beam measured to 55ps.

Set threshold at 200 photons

(1 MIP gives 600 Photons)

Photons in T0-R

Photons in T0-L

25/11 2002


ALICE Si-FMD,T0,V0T0 efficiency

ALIROOT and Pythia simulations for MB p+p

200 photon threshold applied

Coinc. eff (L*R) = 83% Left array: =71 and 87 % Right array: =78 and 94

%

T0-R * T0-L

T0-R T0-L

94% 87%

83%

25/11 2002


ALICE Si-FMD,T0,V0T0 timetable

R&D of Cerenkov detector units-HV divider – 2 prototypes ready, 3rd under const. (OK) -Quartz radiators – waiting for final dimensions (no concern) R&D of fast electronics unit-R&D trigger generation unit (CAMAC prototype ready)-prototype I of CFD (failed, high cross-talk but problem solved)-prototype II of CFD (ready, very good test results)-prototype III of CFD (ready, very good test results)-prototype IV of CFD (DTD) (theo.stud.)-time meaner (2 options) (1 prototype

ready)

Responsibilities: Jyvæskylæ, MEPhI, INR, Budker, Kurchatov.

•R&D: laser calibration system•Market survey and purchase (manufacturer located but the purchase is delayed to assure the best configuration)•Development of the calibration system (still in study)•R&D: DAQ and trigger electronics•Collaboration with TOF to guarantee the required performance (TOF is only sub-detector requiring high-precision off-line T0)•Athens has expressed the wish to join. Funding situation should be clear within a few months.•Mechanical construction•1:1 prototype – ready•TDR – progressing as planned

25/11 2002


ALICE Si-FMD,T0,V0Summary

FWD detectors baseline defined

Physics role defined FWD detectors will supply

basic day 1 physics (LVL0 trigger, global reaction information)

Main detector parameters specified

Concrete prototyping and industrial bids started

Projects on track Aim at TDR by mid-2002

Main open issues: integration and installation procedures, materials budget (bgd), cooling, Back End Electronics and DAQ integration, analysis software

Si-FMDSi-FMD

T0T0

V0V0

ALICE Si-FMD,T0,V0 25/11 2002Jens Jørgen Gaardhøje, NBI, [email protected] Forward detector...

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