CSN1 Frascati 25 /6/ 2002Clara Matteuzzi Stato del rivelatore RICH di LHCb CNS1 Roma giugno 2002

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi The LHCb detector Forward single-arm spectrometer  Acceptance: mrad (bending plane) mrad (non-bending plane)  p-p collisions 14 TeV at LHC

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi The RICH of LHCb RICH 1 RICH 2 5 cm aerogel 4 m 3 C 4 F m 3 CF 4

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi The RICH of LHCb Characteristics of the detectors: Radiators properties Cherenkov Angle precision Photoelectron yield RICH 2 RICH 1

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi RICH “light” RICH2: EDR in march 2002: magnetic shield (MILANO) PD support plates (GENOVA) X 0 : 12.4% (TDR) 13.9%(EDR) increased X 0 in exit window closer to pre-shower

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi RICH2 Engineering

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi RICH2 Engineering entry window low mass beam pipe envelope supported by windows spherical mirrors on supporting planes exit window low mass photodetectors with individual magnetic shields magnetic shield box & backward lid (4 tons) to shield against magnetic stray field of ~150 Gauss frame plane mirrors 13.9% X 0

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi RICH2 Engineering Genova design PD housing

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi RICH2 Engineering Magnetic shield Milano design

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi RICH2 Mechanics and optics Top view of one half of RICH2 HPD mounting

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi RICH “light” RICH1: Reduction in material (X 0,, I ) crucial for tracking X 0 : 14% (TDR) 8.5% Removal of RICH1 entrance window and beam-pipe flange/seal Reduced material in spherical mirrors Reduced material in spherical mirror supports (Cherenkov radiators contribute 3.3% + 2.5%)

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi RICH “light” RICH1: L1 trigger requires B-field (0 < z < 2200mm) HPD magnetic shielding requirements Vertical RICH1 design

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi Field Along Beampipe - all designs z y

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi ST1-ST3:identical design as T6-T9 TT1:same position as T2, two technology options are considered IT(Si) + OT(straw) or full Si cost vs robustness, resolution, … possibly split TT1 to two half-stations.

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi RICH1 - Mechanics and Optics Top view Side view (TDR design)

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi Flat mirror The 3D Model R.Forty Optics, S.Jolly Shielding PD plane

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi The RICH of LHCb The PhotoDetectors requirements:  cover an area 2.6 m 2  single photoelectron sensitivity  Q uantum E fficiency > 20% 200 – 600 nm  visible and UV sensitivity  granularity 2.5 x 2.5 mm 2  large active area 75%  LHC speed read-out 40 MHz (25 ns time resolution) Baseline: H ybrid P hoto D iodes ( HPD ) Backup: Multianode PM (MaPMT)

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi  Photocathode diameter 75 mm  Overall 83 mm diameter  PC voltage -20 KV 5000 e signal at Si anode  Electron optics: cross-focussed demagnification 5  Anode: Si pixel detector, bump bonded to pixel readout chip pixel= 50  m x 500  m (320x32 matrix) pixel size at photocathode 2.5 x 2.5 mm pixel The HybridPhotoDiodes Pixel-HPD (DEP) 82% active area 168 HPDs in RICH1 262 HPDs in RICH2 340K electronic channels

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi Pixel HPD Prototype 80mm HPD 3 equipped with 61-pixel anode 1 equipped with phosphor + CCD anode Final Anode assembly Ceramic PGA carrier Silicon sensor, bump bonded to pixel chip and wire-bonded to carrier

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi The RICH photon detector choice Milestones for final decision: (delayed to June 2002) 1.Operation of tube with encapsulated ALICE_LHCb chip (10MHz) Implying > 95% pixels operational, Photo-electron Det eff. > 85%, Signal/Threshold > 2.5, Threshold/Noise > 6 2.Operation of LHCb pixel chip at 40MHz Implying threshold and noise performance as above 3.Magnetic Field tests at 30G to demonstrate shielding of axial and transverse fields Signal loss < 10% (including loss due to electron optics and due to shadowing by shield) Continue MaPMT readout development to maintain MaPMT as a viable backup

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi RICH2 – on schedule RICH1 – delayed – LHCb-lite studies Milestone missed – review in June month delay LHC start-up delayed by 21 months LHCC (November 2000) RICH milestones

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi AEROGEL Source of radiation: 60 Co E  = 1.3 MeV, 1.7 MeV Source of radiation: Proton beam 24 GeV 10 year LHCb operation

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi Sector #4 Sector #8 Ring region Out of ring sect 4 sect 8 Test beam results Test beam results 9 Gev/c π ¯ beam 4 cm aerogel Novosibirsk noise/pad < 2 ‰

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi AEROGEL Test Beam

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi Novosibirsk No filterFilter D263 4 cm 8.3 ± ± ± ± cm 10.7 ± ± ± ± 1.0 Photoelectron yield Contributions to total error: background subtraction (±1σ): ~ 5% inefficient or noisy pads : ~ 4% definition of ‘active region’ (±1mm): 2% separation of on-ring/off-ring (±2mm): 3% signal losses outside ADC thresholds (±1σ): 3% Data MC results are normalised to 2π acceptance off-ring Npe 4 cm (off-ring) 1.00 ± ± ± ± cm (off-ring) 1.10 ± ± ± ± 0.10 results are in units of 10 ¯ ² /cm ² on-ring

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi Ring reconstruction Thickness No filterFilter D263Glass R σ R 4 cm cm cm cm Data MC Data Novosibirsk Matsushita rad Study resolution as a function of - filter type - aerogel thickness - aerogel type single photoelectron Results per single photoelectron are (mrad): -- Data -- Monte Carlo 4cm Novosibirsk (no filter) θcθc

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi Ring reconstruction Contribution to angular resolution is determined with the simulation : Resolution is expected to scale as A/√N + k (in the 3σ ring region) Sourceσ (mrad) Pixelling1.3 Chromaticity2.5 Point spread func. + Emission point 1.1 Beam divergence0.7 Allignement2.2 TOTAL Fit to data Resolutions differ by ~20-40% in MC with respect to the Data. Still under investigation.

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi  / p separation at 8 GeV 6 GeV 10 GeV rad SINGLE ph.e. 6.1  4.8  3.1  θ PID performance

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi Evaluate separations N σ = Δθ/σ θ, scaling with the N pe and extrapolate to the total acceptance Energyθpθp θπθπ NσNσ 6 GeV194.0± ± GeV216.4± ± GeV224.8± ± π-ring p-ring Clear π/p separation For 4 cm aerogel + filter: PID performance

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi Specchi compositi costruiti a Milano (tecnica della Sanita’ segnalataci da Carlo Bosio) Da aprile: prepiegatura delle lastre di plexiglass a Milano “sandwich” composto nel forno al CERN (per polimerizzazione dell’araldite)

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi Specchi compositi Il forno (prestito dell’I.S.Sanita’) installato nel laboratorio LHCb a Milano

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi Specchi compositi Lo stampo

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi Gli specchi

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi Specchi compositi Prototipi fatti a Milano

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi Specchi compositi Prototipi fatti a Milano

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi Specchi compositi (Milano)

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi Specchi compositi (Milano)

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi CMA composite prototype We We want 95% of light within diameter of 2.5mm

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi Tests in TA2 optical lab D 0 = 1.2  1.3 mm CMA mirror

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi ?  CMA (USA) Composite Mirror Applications 2mmComposite: Carbon+Epoxy < 10.4?INFN10 mm Composite: Plexi+Epoxy  Russia6mm could be thinner Be + 0.3mm glass  IMMA Turnov (Cz.R) 6mm TDR: Glass X0%X0% % Mech spec Opt spec Manufacturer Cost kCHF Only spherical mirrors inside spectrometer acceptance 2.Second (plane) mirror can be thick glass 3.Mirror technologies RICH-1 Mirrors: the options Technology 1000 ? 50  thick

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi Gli impegni italiani RICH2 : Piani di supporto dei PD (GENOVA) da finalizzare secondo PD Schermo magnetico (MILANO ) disegno finale pronto per gare RICH1 : Radiatore Aerogel (MILANO) Specchi compositi (MILANO ) nelle specifiche ottiche test di stabilita’

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi Gli impegni italiani Nell’ambito dell’attivita DAQ, GENOVA si occupa della scheda di interfaccia Glue-Card, tra Credit Card-PC e scheda di elettronica.

ECS Compiti del Gruppo di Genova Il gruppo di Genova deve realizzare la scheda di interfaccia, denominata Glue-Card, fra Credit Card-PC e generica scheda di elettronica curandone anche la programmazione. Sono già stati svolti degli studi preliminari in merito e la specifica definitiva sarà emanata nel corrente mese di Giugno in collaborazione con il gruppo CERN coinvolto in questa attività. Il lavoro effettivo consisterà nella realizzazione: 1.di alcune schede prototipo complete e funzionanti corredate della relativa documentazione (schematica e descrizione) in modo che essa possa essere “clonata” nel numero di esemplari necessari dai gruppi “utenti” ed installata opportunamente sulle relative schede. 2.di una “evaluation board” per il sistema Credit-Card-PC + Glue-Card che possa essere utile per sviluppo del software di sistema e per la soluzione di problemi generali di diagnostica e/o fault repair che possano presentarsi nel tempo per tutta la durata dell’esperimento.

Glue Card : Costi e tempi di realizzazione Realizzazione prototipo definitivo : giugno 2003 Costi di sviluppo complessivo : (su esercizi finanziari 2002 e 2003) qMateriale Consumo : 16 kEuro qMissioni estere : 16 kEuro (4 m.u. di missione al CERN per attività tecnica in diretta collaborazione con gruppo on line LHCb) Per l’ anno in corso 2002 si chiedono quindi ad integrazione del bilancio già approvato: qMateriale Consumo : 8 kEuro qMissioni estere : 8 kEuro

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi Richieste di Milano in corso 2002 Consumi euro Trasporti 2500 euro Conguaglio ME 7000 euro (4.3 f.e. Invece di 3.6) Slocco s.j. per spettrofotometro (12 Keuro)

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi Richieste in corso 2002 (Milano consumi) Honeycombe : D D Carbon mat 700 Plexyglass 800 Colla 100 Materiale vario Totale euro

CSN1 Frascati 25 /6/ 2002Clara Matteuzzi Richieste in corso 2002 (Milano trasporti o ME??) 6 viaggi per trasporto lastre plexyglass e stampo (furgoncino a nolo) circa 2500 euro presi da m.e.