Silicon Tracking System in CBM experiment
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Silicon Tracking System in CBM experiment
Paweł StaszelJagiellonian University
Physics motivation Detector concept STS Plans
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8-40 GeV/n
Paweł Staszel NA61/SHINE collaboration meeting, Zagreb 12.10.2011 4
CBM (Compressed Baryonic Matter)
net-baryon density created in central Au+Au
How to explore interesting regions of the QCD Phase Diagram
Lattice QCD calculations:Fedor & Katz, Ejiri et al.
Freeze-out phase can be studied by measurement of „soft” hadrons production (bulk observables)
Information about earlier phases is carried by rare probes:
• High pT particles
• Particles decaying into leptons• Particles build up of heavy quarks (J/ψ, D, Λ
c ....)
and by collective motion (flow) of the created soft medium. (e .g. v
2 is
sensitive to the quanta interaction just after the medium formation)
How to explore interesting regions of the QCD Phase Diagram
Lattice QCD calculations:Fedor & Katz, Ejiri et al.
Freeze-out phase can be studied by measurement of „soft” hadrons production (bulk observables)
Information about earlier phases is carried by rare probes:
• High pT particles
• Particles decaying into leptons• Particles build up of heavy quarks (J/ψ, D, Λ
c ....)
and by collective motion (flow) of the created soft medium. (e .g. v
2 is
sensitive to the quanta interaction just after the medium formation)
large advantage from simultaneous measurement of “ordinary” hadrons and rare probes
⇒ probing medium with known overall characteristics
Projects to explore phase diagram at large mB
RHIC energy-scan ................................ bulk observablesNA61@SPS ......................................... bulk observables
MPD@NICA ........................................ bulk observables
CBM@FAIR ........................................ bulk and rare observables
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Dipolmagnet
Ring ImagingCherenkovDetector
Transition Radiation Detectors
Resistive Plate Chambers (TOF)
Electro-magneticCalorimeter
SiliconTrackingStations
Projectile SpectatorDetector(Calorimeter)
VertexDetector
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CBM Detector (->+-)
beam
ABSORBER(1,5 m)
TRDs(4,6,8 m)
TOF(10 m)
ECAL(12 m)
STS ( 5 – 100 cm)
magnet
PSD(~15 m)
CBM Target region
STS: 8 detectors stations in thermal enclosure
Silicon Tracking System, Micro Vertex Detector, Target, Beam pipe, Superconducting Dipole Magnet
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MVD: 2 detectors stations vacuum vessel
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Silicon Tracking System – heart of CBM
Challenge: high track density: 600 charged particles in 25o @10MHz
Tasks:• track reconstruction: 0.1 GeV/c < p 10-12 GeV/c, p/p ~ 1% (p=1 GeV/c)• primary and secondary vertex reconstruction (resolution 50 m)
V0 track pattern recognition
c = 312 m
radiation hard and fast silicon pixel and strip detectors
self triggered FEE
high speed DAQ and trigger
online track reconstruction!
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Silicon Tracking Performance
momentum resolution1.3%
(tracks pointing to primary vertex)
[%
]
p [GeV/c]
central Au+Au 25 AGeV (UrQMD)
700 reconstructed tracks
X-Z view
Y-X view
<1 % ghost tracks
96%
[%
]
p [GeV/c]
reconstruction efficiency
momentum resolution
Cellular Automaton and Kalman Filter,
50 ms on Pentium 4
A. Bubak, 19:40 on Wednesday
Hyperons: PID from decay topology in STS
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ρ,ω,φ
ρ, ω, φ J/ψ, ψ'
Signal and background yields from physics event generators (HSD, UrQMD) Full event reconstruction based on realistic detector layout and response
Feasibility studies for dilepton measurements
Electron id:RICH and TRD
Muon id:segmented hadron absorber+ tracking system
125(225) cm iron,15(18) det. layers
π suppression:
factor 104
dominant background: e from π0 Dalitz
125 cm Fe: 0.25 ident. /event
dominant background: μ from π, K decay (0.13/event)
J/ψ200k events 4 1010 events
4 108 events 3.8 1010 events
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STS: 8 stations double-sided Silicon micro-strip sensors (8 0.4% X0)
MVD: 2 stations MAPS pixel sensors (0.3% X0, 0.5% X
0) at z = 5cm and 10cm
no K and π identification, proton rejection via TOF
10 weeks data taking reduced interaction
rate 105/s:
Open charm measurement
D → K π π, cτ= 317 μm
109 centr. ev.
eff = 2.6%
S/B = 2.4 (D-) 1.1 (D+)
D0 → K π, cτ= 123 μm
1010 centr. ev.
eff = 4.4%
S/B = 6.4 (D0) 2.1 (D0)
_
and
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Performance summary
Maximum beam intensity: 109 ions/s10 weeks of Au-beam at 25 AGeV beam energy
• Minimum bias collisions can be recorded with 25kHz→ unlimited statistics for bulk observables (K, L)→ 106 , , r w f mesons, 108 X, 106 W (spectra, flow, correlations, fluctuations)
• Open charm trigger will allow for 100kHz → 104 open charm hadrons• Charmonium trigger with max. beam intensity: 10MHz→ 106 J/Y• (charm production, spectra, flow measurement)
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STS Layout
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~1m
Silicon Tracking System
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Mechanics & Cooling
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more then 4 000 bonds
more then 12 000 bonds
Demonstrator modules
Single-detector module (CBM03-ISTC)
Triple-detector module (CBM03-ISTC)
Assembled at SE SRTIIE, Kharkov, Ukraine
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Plans
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• R&D: 2011 – 8/2013
• Production: 2013 – 6/2017
• Pre-production: 2013 – 3/2015
- Pre-production at GSI
- Pre-production at AGH
- Pre-production at PIT - Tübingen
- Pre-production at JINR - Dubna
- Pre-production at JU
◊ Production Readiness Report: 1.8.2013
• Series production: 2015 – 6/2017
STS project time line
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PlansIn order to integrate partial STS R&D, and to prepare for production phase PIT, AGA and JU prepared application (submitted to NupNET - failed)
The application addresses: -> modules assembly, -> series production quality assurance, -> mass testing and -> the development of radiation hard front-end ASICs.
The goal is to make a first prototype STS module and make a full characterization using dedicated FEE and R/O.
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BACKUP SLIDES
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Paweł Staszel NA61/SHINE collaboration meeting, Zagreb 12.10.2011 28
Kaon spectra versus hadronic models
UrQMD and HSD models can describe p+p and light Ion data (C+C).
Description of kaon spectra in central Au+Au and Pb+Pb requires contribution from strong parton-parton interactions in the early phase
E. Bratkovskaya et al. PRL 92, 032302 (2004)
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CBM CollaborationChina:Tsinghua Univ., BeijingCCNU WuhanUSTC Hefei
Croatia:
University of SplitRBI, Zagreb
Portugal: LIP Coimbra
Romania: NIPNE BucharestBucharest University
Poland:Krakow Univ.Warsaw Univ.Silesia Univ. KatowiceKraków AGH(Inst. Nucl. Phys. Krakow)
LIT, JINR DubnaMEPHI MoscowObninsk State Univ.PNPI GatchinaSINP, Moscow State Univ. St. Petersburg Polytec. U.
Ukraine: INR, KievShevchenko Univ. , Kiev
Univ. MannheimUniv. MünsterFZ RossendorfGSI Darmstadt
Czech Republic:CAS, RezTechn. Univ. Prague
France: IPHC StrasbourgGermany: Univ. Heidelberg, Phys. Inst.Univ. HD, Kirchhoff Inst. Univ. Frankfurt
Hungaria:KFKI BudapestEötvös Univ. BudapestIndia:Aligarh Muslim Univ., AligarhIOP BhubaneswarPanjab Univ., ChandigarhGauhati Univ., Guwahati Univ. Rajasthan, JaipurUniv. Jammu, JammuIIT KharagpurSAHA KolkataUniv Calcutta, KolkataVECC Kolkata
Univ. Kashmir, SrinagarBanaras Hindu Univ., Varanasi
Korea:Korea Univ. SeoulPusan National Univ.Norway:Univ. Bergen
Kurchatov Inst. MoscowLHE, JINR DubnaLPP, JINR DubnaCyprus:
Nikosia Univ.
55 institutions, > 400 members
Dubna, Oct 2008
Russia:IHEP ProtvinoINR TroitzkITEP MoscowKRI, St. Petersburg
Paweł Staszel NA61/SHINE collaboration meeting, Zagreb 12.10.2011 30
In parallel, in time steps of 10-100s in SIS100/300 proton/heavy ion beams are accelerated to high energy: 90GeV – protons, 45GeV – heavy ions
High energy proton and heavy ion beam are gradually extracted for HADES+ and CBM experiments
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Mapping the QCD phase diagram with heavy-ion collisions
net baryon density: B 4 ( mT/2h2c2)3/2 x [exp((B-m)/T) - exp((-B-m)/T)] baryons - antibaryons
Lattice QCD calculations:Fedor & Katz,Ejiri et al.
SIS300