29/ Jens Jørgen Gaardhøje, NBI, 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)

29/ Jens Jørgen Gaardhøje, NBI, ALICE Forward Detectors oFMD (Forward Multiplicity Detector) NBI+INR o5 Si-strip Ring counters with 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

29/ Jens Jørgen Gaardhøje, NBI, 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

29/ Jens Jørgen Gaardhøje, NBI, The FMD in ALICE

29/ Jens Jørgen Gaardhøje, NBI, 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<  < INNER rings: 20φ, 512 strips 2 OUTER rings: 40φ,256 strips TOTAL: ch

29/ Jens Jørgen Gaardhøje, NBI, Low Occupancy, Precise multiplicity 2 Occupancy: < 3 for all collisions <1 for most =>Energy and counting mode Precise multiplicity reconstruction 1

29/ Jens Jørgen Gaardhøje, NBI, Background, Fluctuations Background from secondaries from other ALICE detectors Background from secondaries: Determines the ability to study fluctuations

29/ Jens Jørgen Gaardhøje, NBI, 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 Inner Outer 6”

29/ Jens Jørgen Gaardhøje, NBI, Ring and sensor assembly

29/ Jens Jørgen Gaardhøje, NBI, Ring mounting on RB26 Displacement < 50 μ

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

29/ Jens Jørgen Gaardhøje, NBI, 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

29/ Jens Jørgen Gaardhøje, NBI, FMD ReadOut Electronics Scheme

29/ Jens Jørgen Gaardhøje, NBI, 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

29/ Jens Jørgen Gaardhøje, NBI, FMD electronics total Segments (wafers) Phi sectors Radial strips FE channels VA chips (128 ch/chip) ALTRO chips FMD Digitizers FMD RCU FMD3 inner , FMD3 outer , FMD2 inner , FMD2 outer , or 2 FMD , Total system , or 3

29/ Jens Jørgen Gaardhøje, NBI, Integration in ALICE- RB26 1:1 scale model to study mechanics and cabling.

29/ Jens Jørgen Gaardhøje, NBI, Integration in ALICE- RB24

29/ Jens Jørgen Gaardhøje, NBI, FMD Timescale OK System Cost: 800 kCHF

29/ Jens Jørgen Gaardhøje, NBI, Spares

29/ Jens Jørgen Gaardhøje, NBI, 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

29/ Jens Jørgen Gaardhøje, NBI, RO electronics

29/ Jens Jørgen Gaardhøje, NBI, FMD digitizer