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29/09 2004Jens Jørgen Gaardhøje, NBI, Forward Detectors TDR FMD, T0, V0 Editorial team: I.G. Bearden (NBI) H. Bøggild (NBI) C.Holm (NBI)

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Presentation on theme: "29/09 2004Jens Jørgen Gaardhøje, NBI, Forward Detectors TDR FMD, T0, V0 Editorial team: I.G. Bearden (NBI) H. Bøggild (NBI) C.Holm (NBI)"— Presentation transcript:

1 29/09 2004Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk1 Forward Detectors TDR FMD, T0, V0 Editorial team: I.G. Bearden (NBI) H. Bøggild (NBI) C.Holm (NBI) J.J. Gaardhøje (NBI) J.Y. Grossiord (Lyon) T. Malkiewicz (Jyvaesk.) B.S. Nielsen (NBI) G. Paic (Mexico) W. Trzaska (Jyvaeskyla)

2 29/09 2004Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk2 ALICE Forward Detectors oFMD (Forward Multiplicity Detector) NBI+INR o5 Si-strip Ring counters with 51.200 channels o1.7<  < 5.0; -1.7<  <-3.4 oPrecise off-line charged particle multiplicity for A+A, p+p oFluctuations event-by-event, flow analysis oV0 (Centrality and collision vertex) Lyon+Mexico o2 arrays of 32 plastic scintillator tiles w. fiber+PMT o2.8<  < 5.1; -1.7<  < -3.7 oMain L0 MinBias for p+p and A+A and centrality trigger A+A oBackground (Beam-Gas) rejection, TRD wakeup oT0 (Beam-Beam Detector) Jyvæskyla+MEPhI,INR,Budker,Kurchatov o2 arrays of 12 Cerenkov radiators + PM tubes o4.5<  < 5.0; -2.9<  < -3.3 oFast timing L0 signal (  =50ps), online vertex determination oMain time reference, TRD wakeup, backup for MinBias trigger

3 29/09 2004Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk3 Forward Multiplicity Detector (FMD) FMD (Forward Multiplicity Detector) for ALICE oPhysics Goals oSystem Overview and Geometry oSimulated Performance oSilicon strip detectors: oSensors, modules, rings oReadout electronics: oPreamplifier, digitizer, readout/control oIntegration in ALICE oTimescale/Milestones

4 29/09 2004Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk4 The FMD in ALICE

5 29/09 2004Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk5 Rapidity Coverage FMD3: Outer: -2.29<  <-1.70 Inner: -3.40<  <-2.01 FMD2: Outer : 1.70<  <2.29 Inner : 2.28<  <3.68 FMD1: Inner: 3.68<  <5.03 3 INNER rings: 20φ, 512 strips 2 OUTER rings: 40φ,256 strips TOTAL: 51200 ch

6 29/09 2004Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk6 Low Occupancy, Precise multiplicity 2 Occupancy: < 3 for all collisions <1 for most =>Energy and counting mode Precise multiplicity reconstruction 1

7 29/09 2004Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk7 Background, Fluctuations Background from secondaries from other ALICE detectors Background from secondaries: Determines the ability to study fluctuations

8 29/09 2004Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk8 Si sensors from 6 ” wafers Si-Sensors: 300 μm Si wafer, 2 φ sectors of 512 (256) strips each. Contract awarded to Hamamatsu First prototype to be delivered in December 2004. Inner Outer 6”

9 29/09 2004Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk9 Ring and sensor assembly

10 29/09 2004Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk10 Ring mounting on RB26 Displacement < 50 μ

11 29/09 2004Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk11 Pre amplifier and hybrids Pre-amplifier chip: ’VA1-Alice’ from IDEAS. 128 ch, RadHard (0.35μ tech), dynamic range 20 MIP, Low noise, <25pF

12 29/09 2004Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk12 Pre amplifier chip production completed Production of 500 chips completed. First lab. tests: Noise: 185 e - => S/N=125 Good linearity, peaking time 1.2 – 1.7 μsec. 1.2 μs

13 29/09 2004Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk13 FMD ReadOut Electronics Scheme

14 29/09 2004Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk14 VA-ALICE-ALTRO compatibility demonstrated Digitizer board with 3 ALTRO chips is under design & construction at NBI. RCU identical to TPC, PHOS DAQ and DCS is similar to other systems

15 29/09 2004Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk15 FMD electronics total Segments (wafers) Phi sectors Radial strips FE channels VA chips (128 ch/chip) ALTRO chips FMD Digitizers FMD RCU FMD3 inner 102051210,24080621 FMD3 outer 204025610,2408062 FMD2 inner 102051210,2408062 FMD2 outer 204025610,24080621 or 2 FMD1102051210,2408062 Total system 7014051,20040030102 or 3

16 29/09 2004Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk16 Integration in ALICE- RB26 1:1 scale model to study mechanics and cabling.

17 29/09 2004Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk17 Integration in ALICE- RB24

18 29/09 2004Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk18 FMD Timescale OK System Cost: 800 kCHF

19 29/09 2004Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk19 Spares

20 29/09 2004Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk20 Breakdown of FMD cost Silicon strip detectors345 kCHF Front End (Chips and hybrids)240 kCHF Back End (Digitizer, RCU, DAQ)70 kCHF Mechanics(Cones, Supports, transport) 55 kCHF Power supplies and cables, contingency 90 kCHF Total system cost800 kCHF

21 29/09 2004Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk21 RO electronics

22 29/09 2004Jens Jørgen Gaardhøje, NBI, gardhoje@nbi.dk22 FMD digitizer

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