2 nd 2 nd Super-B Factory Workshop Super-B Factory Workshop April 20-22, 2005 April 20-22, 2005 Hawaii Hawaii The status of LHCb Construction The status of LHCb Construction R. Le Gac R. Le Gac on behalf of the LHCb Collaboration on behalf of the LHCb Collaboration CPPM, Marseille CPPM, Marseille 1
LHC Environment LHC Environment LHC: LHC: Proton-proton collision Proton-proton collision pp interaction/crossing s = 14 TeV inel = 80mb Bunch crossing rate 40 MHz Bunch crossing rate 40 MHz Luminosity: Luminosity: (first two years) 33 cm − 2 s − 1 (first two years) 1 − 2 × 10 34 cm − 2 s − 1 (nominal) 10 (nominal) At high luminosity, pile-up of pp At high luminosity, pile-up of pp interactions per bunch crossing: interactions per bunch crossing: 32 cm − 2 s − 1 LHCb chooses LHCb chooses 2 × 10 Should be available from day one Should be available from day one 2fb 2fb -1 -1 per year ( per year (10 10 7 7 second) second) LHC machine had a problem with cryogenic plumbing, now resolved. LHC machine had a problem with cryogenic plumbing, now resolved. First beam expected in 2007. First beam expected in 2007. 2
b-production b-production Pair of quarks are mostly produced Pair of quarks are mostly produced bb in the forward/backward direction: in the forward/backward direction: bb = 500 b 12 bb 10 produced per year produced per year LHCb is a forward spectrometer: LHCb is a forward spectrometer: Acceptance 10-300 mrad Acceptance 10-300 mrad Efficient B Efficient B-mesons -mesons trigger trigger Good Kaon/pion identification Good Kaon/pion identification Good invariant mass resolution Good invariant mass resolution Good proper time resolution Good proper time resolution 3
LHCb LHCb 4
UX85 UX85 ... ... The UX85 cavern mid April '05 5
Magnet Warm magnet Coil shape follows acceptance ∫Bdl = 4 Tm Power 4.2 MW Iron yoke 1500 Tons Nominal current Nov 'O4 6
Beam Pipe Beam Pipe Located in the high rapidity region Located in the high rapidity region Main source of secondary particles ! Main source of secondary particles ! where particle density is high. where particle density is high. Minimize the amount of material using Be. Minimize the amount of material using Be. 7
Status of the Beam Pipe Status of the Beam Pipe Al window Al bellows (prototype) (prototype) UX85/1 In production. In production. Installation in UX85 in Q2 '06 Installation in UX85 in Q2 '06 8
Vertex locator... Vertex locator... Key element surrounding the IP: Key element surrounding the IP: Measure the position of the primary Measure the position of the primary and the B and the B d,s d,s vertexes vertexes Used in L1 trigger. Used in L1 trigger. 9
Overview of the vertex locator Overview of the vertex locator 21 pairs of silicon strip detectors 21 pairs of silicon strip detectors arrange in two retractable halves: arrange in two retractable halves: Strips with an R- Strips with an R-φ φ geometry: geometry: — R strip pitch: 40-102 µm R strip pitch: 40-102 µm — φ φ strip pitch: 36-97 µm strip pitch: 36-97 µm 172k channels. 172k channels. Operated: Operated: In vacuum In vacuum separated from beam vacuum by an Al foil separated from beam vacuum by an Al foil Close to the beam line (7 mm) Close to the beam line (7 mm) Radiation ≤ Radiation ≤ 1.5 1.5× ×10 10 14 14 n n eq eq /cm² per year /cm² per year Cooled at -5 °C Cooled at -5 °C 10
Status of the vertex locator Status of the vertex locator Many others pieces in production. Many others pieces in production. Installation in UX85: November '05 Installation in UX85: November '05 11
Sensors Sensors Characteristics: Characteristics: n+n type n+n type Double metal layers Double metal layers thickness 300 µm thickness 300 µm Laser cut Laser cut Front-end electronics (beetle chip) Front-end electronics (beetle chip) mount on a thin kapton sheet mount on a thin kapton sheet connected to the sensor via pitch connected to the sensor via pitch adapters adapters Alignment of complete half detectors in Alignment of complete half detectors in test beam in June ’06 test beam in June ’06 12
Tracking... Tracking... Key elements to find tracks and to measure Key elements to find tracks and to measure their momentum. their momentum. 13
Overview of the tracking system Overview of the tracking system Trigger Tracker: Trigger Tracker: — Microstrip silicon detector Microstrip silicon detector — 144k channels 144k channels Outer Inner Three T stations: Three T stations: Inner tracker: Inner tracker: — Microstrip Silicon detector Microstrip Silicon detector — 130k channels 130k channels Outer tracker: Outer tracker: — Straw tube (5 mm) Straw tube (5 mm) — 56k channels 56k channels T Stations Trigger Tracker 14
Trigger Tracker Trigger Tracker 1.4 m 1.2 m 0° layer Microstrips silicon detector Microstrips silicon detector Two groups of two layers Two groups of two layers (0°, +5°, -5°, 0°) separated by 30 cm (0°, +5°, -5°, 0°) separated by 30 cm Strip pitch 198 µm Strip pitch 198 µm Strip length 11, 22 and 33 cm Strip length 11, 22 and 33 cm Radiation ≤ Radiation ≤ 9 9× ×10 10 12 12 n n eq eq /cm² over 10 years /cm² over 10 years Cooled at -5 °C Cooled at -5 °C Installation in UX85: July '06 Installation in UX85: July '06 15
T Station: inner tracker part T Station: inner tracker part 0.4 m 1.2 m Microstrips silicon detector: Microstrips silicon detector: Same sensors as Trigger Tracker Same sensors as Trigger Tracker Four layers (0°, +5°, -5°, 0°) Four layers (0°, +5°, -5°, 0°) Strip length 11, 22 cm Strip length 11, 22 cm Radiation Radiation ≤ ≤ 9 9× ×10 10 12 12 n n eq eq /cm² over 10 years /cm² over 10 years Cooled -5 °C Cooled -5 °C Installation in UX85 June '06 Installation in UX85 June '06 16
T station: outer tracker part T station: outer tracker part 5 m Straw tubes: Straw tubes: Four double layers (0°,+5°,-5°,0°) Four double layers (0°,+5°,-5°,0°) Staw length 5 m read on both sides Staw length 5 m read on both sides Ar/CF Ar/CF 4 4 /CO /CO 2 2 Installation in UX85 start November '05 Installation in UX85 start November '05 17
Tracking performances for long tracks Tracking performances for long tracks <Efficiency>: 94% <δp/p>: 0.37% <Ghost rate>: 3% B-decay spectrum 18
RICH... RICH... Key elements to identify pion and kaon in Key elements to identify pion and kaon in the momentum range the momentum range p ∈[ 2,100 ] GeV / c 19
Overview of the RICH Overview of the RICH RICH system divided in two detectors equipped RICH system divided in two detectors equipped with 3 radiators to cover the full acceptance and momentum range: with 3 radiators to cover the full acceptance and momentum range: RICH1: RICH1: — Acceptance: Acceptance: V 2 − 250 mrad p 2 − 60 GeV / c — Aerogel + C Aerogel + C 4 F 10 radiators 4 F 10 radiators — 200k channels 200k channels RICH2: RICH2: — Acceptance: Acceptance: V 15 − 100 mrad p 17 − 100 GeV / c — CF CF 4 4 radiator radiator — 295k channels 295k channels 20
RICH1 RICH1 RICH1 in production RICH1 in production Installation in UX85 start end April '05 Installation in UX85 start end April '05 21
RICH2 RICH2 7 m Transport and installation in July '05 Transport and installation in July '05 22
Photon detector HPD Photon detector HPD Novel photodetector: Novel photodetector: 32 32× ×32 pixel sensor array (500 32 pixel sensor array (500× ×500 µm²) 500 µm²) 20 kV operation voltage 20 kV operation voltage Demagnification factor ~5 Demagnification factor ~5 Production of ~500 tubes started. Production of ~500 tubes started. N 2 radiator 23
Particle Identification Particle Identification Kaon identification efficiency: <K Efficiency>: 88% <π misidentification> 3% 24
Calorimeters... Calorimeters... Key element to identify , Key element to identify , 0 0 and to measure their energy. and to measure their energy. Used in L0 trigger. Used in L0 trigger. 25
Overview of the Calorimeters Overview of the Calorimeters System subdivided in 3 parts: System subdivided in 3 parts: Scintillating Pad Detector (SPD) Scintillating Pad Detector (SPD) and Preshower: and Preshower: — Two plans of scintillator pads Two plans of scintillator pads separated by a 1.5cm lead separated by a 1.5cm lead converter converter Electromagnetic Calorimeter (ECAL): Electromagnetic Calorimeter (ECAL): — Shashlik types, Shashlik types, — Lead+ scintillator tiles Lead+ scintillator tiles — 25 X 25 X 0 0 particles Hadronic calorimeter (HCAL): Hadronic calorimeter (HCAL): scintillators — Iron + scintillator tiles Iron + scintillator tiles — 5.6 5.6 λ λ I I fibers A total of 19k channels readout by A total of 19k channels readout by Wave Length Shifter fibres connected Wave Length Shifter fibres connected to PMs or MaPMTs. to PMs or MaPMTs. PMT 26
Status of the Calorimeters Status of the Calorimeters ~13 m Installation is going on in UX85 Installation is going on in UX85 27
11 April 2005 28
Reconstruction efficiency for Reconstruction efficiency for 0 0 Merged Resolved 29
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