11/9 2001 Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk 1

ALICE FMDAGENDA

Approval of agenda and minutes of last meeting Integration. L. Leistam (09.10-09.25) FMD design overview. JJG (09.25-09.50) Si-FMD Background simul. A. Maievskaia (09.50-

10.15) Si-FMD FE and RO electronics. B.S.Nielsen (10.15-

10.40) Coffee break Si Prototype. A. Angelis/NN (11.00-11.25) T0 status. V.Grigoriev/ H. Trzaska (11.25-11.50) V0 status J.Y.Grossiord/L. Montano (11.50-12.15) PMD news. Y. Viyogi (?) (12.15-12.30)

Summary-Conclusions-Actions, Formation of TDR writing group. JJG+All (12.30-13.00) AOB

11/9 2001 Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk 2

ALICE FMDMain issues

Si-FMD Freeze inner radius?

Freeze general geometry.

Integration with ITS and other FD

Define Services (cables, cooling, etc.)

Define Responsibilities, timetable

Go to bids. Commence Prototyping.

T0 Define final geometry

(L,R) Trigger Timetable Go to prototyping

V0 Design status Integration, trigger Prototyping.

Organization Responsibilities TDR writing group

formation

11/9 2001 Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk 3

ALICE FMDOverall Geometry

-5.4< <-1.6 3 < < 1.6

eta vs distance for various R

0

1

2

3

4

5

6

7

0 200 400 600 800

d (cm)

eta

eta15

eta3

eta6

eta9

eta12

Radius vs eta at various distances from IR

0,0

5,0

10,0

15,0

20,0

25,0

30,0

35,0

40,0

0 2 4 6 8

eta

R(c

m)

d=90

d=180

d=270

d=360

d=450

d=540

d=630

Si 4 Si3(moved)

Si2 Si1

11/9 2001 Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk 4

ALICE FMDIntegration in ALICE

Si-1Si-2

Si-3

V0-R

T0-R

11/9 2001 Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk 5

ALICE FMDSi1 with 6” Wafers

2 Rings

Si 1 inner

Si 1 outer

11/9 2001 Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk 6

ALICE FMDSi1 with 6” Wafers

R=5.3cmR=17.1cm

R=28.8cm

R=39.9cm

R=35.1cm

R=22.1cm

24

24

16

8

2 Rings

Inner Ring

Outer Ring

11/9 2001 Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk 7

ALICE FMDRing geometry

W afer Ø Solution #Rings #W afers Eta coverage

6" 6b 3 8 3.2 - 2.016 2.3 - 1.824 1.8 - 1.5

48

6c 2 8 3.2 - 2.024 2.0 - 1.632

4" 4b 4 8 3.2 - 2.3162432

80

4c 3 8 3.2 - 2.324 2.3 -1.936 1.9 - 1.6568

!!30 cm vertex shift: 1.2

11/9 2001 Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk 8

ALICE FMDBackground and acceptance

Pseudorapidity coverage

Si1 & Si2 (inner and outer)

d(IR)=62.8 and 75.8 cm: 1.51 <||< 1.94 2.03 <||< 3.58

Si3: d(IR)345cm -5.28 << -3.71

Vertex shift (30cm): |d| 0.3

11/9 2001 Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk 9

ALICE FMDBackground simulations

Alla Maevskaia

11/9 2001 Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk 10

ALICE FMDBackground simulations

Alla Maevskaia

11/9 2001 Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk 11

ALICE FMDBackground simulations

Alla Maevskaia

11/9 2001 Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk 12

ALICE FMDBackground simulations

Alla Maevskaia

11/9 2001 Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk 13

ALICE FMDRHIC vs. LHC

RHIC (s=130 AGeV): -5 << 5 Plateau: –2 << 2 (40% of range) dN/d(=0)=550.

(s=200 AGeV): -6 << 6

dN/d(=0)=610. Nch =5100

LHC (s=5800 AGeV): -9 << 9

BRAHMS @ RHIC 200

BRAHMS 200AGEV

11/9 2001 Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk 14

ALICE FMDLimiting particle

prod. in fragmentation region

RHIC: saturation of particle production in fragmentation region is already achieved at SPS.

Width of Frag. Region is 3.

LHC: = (–9,+9) RHIC200: = (–6,+6). May expect that

central region at LHC extends to –(6,+6).

Si-FMD and V0 detectors cover (-1.5,5.3), i.e. interesting region.BRAHMS. Subm. to Phys Lett. B. 2001

SPS

BRAHMS: RHIC 200. Prelim

11/9 2001 Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk 15

ALICE FMDSi-FMD Role in Trigger

Physics and rates Central Pb+Pb : Nch(Si) 15.000-20.000 p+p Nch(Si) 50-100

Pb+Pb 8kHz. (1kHz central)

Average event spacing >100s

p+p up to 1 coll/bunch crossing

Average event spacing 25 ns

WHO does it? LVL0 Timing: T0 Vertex ( 1-2 cm) T0 Vertex ( 0.1-0.2 cm) TPC Rough on-line Centrality

cut on dE V0 p+p trigger V0 Timing+vertex(p+p) T0,V0

Precise centrality Si Fluctuations Si Azimuthal distribution Si Off-Line PID (dE) Si Level 0 T0,V0 Off-line, Higher level Si

11/9 2001 Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk 16

ALICE FMDElectronics overview

Assume 128 strips/wafer Assume 32 channels/chip Assume 8 chips/RO card

Wafers Phi sectors Strips/wafer Channels FE Chips Chips/card FE Cards

Si 1 inner ring 8 16 128 2048 64 8 8

Si 1 outer ring 24 24 128 3072 96 8 12

Si 2 inner ring 8 16 128 2048 64 8 8

Si 2 outer ring 24 24 128 3072 96 8 12

Si 3 8 16 128 2048 64 8 8

Si 4 8 16 128 2048 64 8 8

Total inner 48 48 6144 192 24

Total outer 32 64 8192 256 32

Total system 80 112 14336 448 56

11/9 2001 Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk 17

ALICE FMDCost Estimate

Item Units Unit price Total Summed

Si-wafers

Proto 1 25 50000

Proto 2 25 50000

Production 1 25 25000

Production 2 25 25000

Misc. 20000

Si total 170000

Electronics

Chips 448 100 44800

FE cards 56 300 16800

Hybrids 112 100 11200

Misc. 20000

FE total 92800

Construction

Assembly/bond 50000

Mechanical 50000

Test 70000

Assembly total 170000

Transportation 20000

Installation 20000

Receiver 100000

DAQ 50000

Grand total 582800

VERY uncertain and preliminary estimate

in CHF. 6ӯ:

still experimental Test production

batch: 16-25 wafers

11/9 2001 Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk 18

ALICE FMDSi-FMD Timetable

. Item Status Est. completion date Comments

Overall system design Ongoing July 2001  

Choice of RO electronics Ongoing September 2001  exploration

Procure Test wafers October 2001 

 

Needs industry survey

Procure test RO electr.   October 2001  

Mechanical design and integration in ALICE

Ongoing December 2001  

Assembly test detector   March 2002  

Tests with sources/beam   March 2003  

Final design   June 2003  

Procure full Si and FE   June 2003  

Manufacture mechanics   December 2003  

Delivery   February 2004  

Assembly full system   October 2004  

Installation in ALICE   June 2005  

First p+p runs   August 2006  

First A+A runs   Spring 2007  

11/9 2001 Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk 19

ALICE FMDResponsibilities Si-FMD

TASKS Update geometry and

integration drawings Update simulations of

background, resolution and performance

Choice of electronics Tender and order

prototype 6” wafers Construct and test

FE+RO system Test DAQ and integrate

with DAQ Update prelim-TDR-

started PPR- needs to develop

WHO? NBI

INR

NBI NBI

NBI + ?

?

NBI, INR, Athens, ?

11/9 2001 Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk 20

ALICE FMDResponsibilities T0 &

V0

TASK T0 Tech. Design study T0- technology decision

and funding T0 prototyping

V0 TDR Prototyping

Who? MEPHI and Jyvaskyla

”

”

Lyon and Mexico

11/9 2001 Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk 21

ALICE FMDEndorsed

Recommendation to ALICE Forum,TB,MB,CB Si-FMD acceptance

downscoped to -5.28 < < -3.71

1.51 < < 3.58 Background from beam

pipe important-> redesign needs to be pursued

Si-FMD not present in trigger at LVL0. Analog sum trigger for LVL1 seems possible but not likely.

FEE /(ampl. Chip. Hybrid, ADC, receiver) can be developed together with IDEAS-Norway.

Revisit segmentation for flow analysis

T0 is main Alice timing trigger

Two arm necessary for good vertex also in absence of TPC and pixels

Radiator-PM is baseline design

Two-arm V0 for beam gas-rejection

V0 is main Alice centrality trigger

Integrate Si3, T0(L), V0(L) and PMD