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