17-19 January 2005 5th BMBF-JINR Workshop, Walter F.J. Müller, GSI 2
Outline
Physics physics case observables
Experiment requirements challenges
17-19 January 2005 5th BMBF-JINR Workshop, Walter F.J. Müller, GSI 3
States of strongly interacting matter
Compression + heating = quark-gluon plasma (pion production)
baryons hadrons partons
Neutron stars Early universe
17-19 January 2005 5th BMBF-JINR Workshop, Walter F.J. Müller, GSI 4
Phase diagram of strongly interacting matter
Freeze-out points calculated from measured particle ratios using the statistical model
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.
dilute: B 0.04 fm-3 0.24 0
dense: B 1.0 fm-3 6.2 0
17-19 January 2005 5th BMBF-JINR Workshop, Walter F.J. Müller, GSI 5
Probing matter at high densities
Trajectories calculated by a 3-fluid hydrodynamics modelToneev & Ivanov
30 AGeV trajectory close to critical endpoint
17-19 January 2005 5th BMBF-JINR Workshop, Walter F.J. Müller, GSI
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SIS 100 Tm
SIS 300 Tm
U: 35 AGeV
p: 90 GeV
Compressed Baryonic Matter
The future Facility for Antiproton an Ion Research (FAIR)
17-19 January 2005 5th BMBF-JINR Workshop, Walter F.J. Müller, GSI 7
Phase diagram of strongly interacting matter
CERN-SPS, RHIC, LHC: high temperature, low baryon densityGSI SIS300: moderate temperature, high baryon density
17-19 January 2005 5th BMBF-JINR Workshop, Walter F.J. Müller, GSI
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States of strongly interacting matter
“Strangeness" of dense matter ?In-medium properties of hadrons ?Compressibility of nuclear matter?
Deconfinement at high baryon densities ?
17-19 January 2005 5th BMBF-JINR Workshop, Walter F.J. Müller, GSI 9
CBM Physics Topics and Observables In-medium modifications of hadrons
onset of chiral symmetry restoration at high ρB
measure: , , e+e- open charm (D mesons)
Strangeness in matter enhanced strangeness production measure: K, , , ,
Indications for deconfinement at high ρB
anomalous charmonium suppression ? measure: J/, D
Critical point event-by-event fluctuations
Color superconductivity precursor effects ?
17-19 January 2005 5th BMBF-JINR Workshop, Walter F.J. Müller, GSI 10
Low-mass dileptons: Pb+Au@40 AGeVCERES Collaboration S. Damjanovic and K. Filimonov, nucl-ex/0109017
17-19 January 2005 5th BMBF-JINR Workshop, Walter F.J. Müller, GSI 11
Meson production in central Au+Au
SIS18 SIS100/ 300
W. Cassing, E. Bratkovskaya, A. Sibirtsev, Nucl. Phys. A 691 (2001) 745
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Open Charm detectionD meson production in pN collisions
Some hadronic decay modes
D (c = 317 m):D+ K0+ (2.90.26%)
D+ K-++ (9 0.6%)
D0 (c = 124.4 m):D0 K-+ (3.9 0.09%)
D0 K-+ + - (7.6 0.4%)
Measure displaced vertex with resolution of 30 μm !
17-19 January 2005 5th BMBF-JINR Workshop, Walter F.J. Müller, GSI 13
CBM Setup
Radiation hard Silicon pixel/strip detectors in a magnetic dipole field
Electron detectors: RICH & TRD & ECAL: pion suppression up to 105
Hadron identification: RPC, RICH
Measurement of photons, π0, η, and muons: ECAL
CBM Collaboration : 42 institutions, 14 countriesCroatia: RBI, Zagreb
Cyprus: Nikosia Univ. Czech Republic:Czech Acad. Science, RezTechn. Univ. Prague France: IReS Strasbourg
Germany: Univ. Heidelberg, Phys. Inst.Univ. HD, Kirchhoff Inst. Univ. FrankfurtUniv. KaiserslauternUniv. Mannheim Univ. MarburgUniv. MünsterFZ RossendorfGSI Darmstadt
Russia:CKBM, St. PetersburgIHEP ProtvinoINR TroitzkITEP MoscowKRI, St. PetersburgKurchatov Inst., MoscowLHE, JINR DubnaLPP, JINR DubnaLIT, JINR DubnaLTP, JINR DubnaMEPhi, MoskauObninsk State Univ.PNPI GatchinaSINP, Moscow State Univ. St. Petersburg Polytec. U.Spain: Santiago de Compostela Univ. Ukraine: Shevshenko Univ. , KievUniv. of Kharkov
Hungaria:KFKI BudapestEötvös Univ. Budapest
Korea:Korea Univ. SeoulPusan National Univ.
Norway:Univ. Bergen
Poland:Krakow Univ.Warsaw Univ.Silesia Univ. Katowice Portugal: LIP Coimbra
Romania: NIPNE Bucharest
17-19 January 2005 5th BMBF-JINR Workshop, Walter F.J. Müller, GSI 16
CBM & Дубна
From first page
of CBM
Collaboration List
4 Labs38 Persons
17-19 January 2005 5th BMBF-JINR Workshop, Walter F.J. Müller, GSI 17
Experimental Challenges
107 Au+Au reactions/sec (beam intensities up to 109 ions/sec, 1 % target)
determination of (displaced) vertices with high resolution ( 30 m)
identification of electrons and hadrons
Central Au+Au collision at 25 AGeV:URQMD + GEANT4
160 p 360 - 330 + 360 0 41 K+ 13 K-
17-19 January 2005 5th BMBF-JINR Workshop, Walter F.J. Müller, GSI 18
Pion misidentification
a)0% b)0.01%
c)0.1% d)1%
17-19 January 2005 5th BMBF-JINR Workshop, Walter F.J. Müller, GSI 19
Experimental Conditions
Hit rates for 107 minimum bias Au+Au collisions at 25 AGeV:
Rates of > 10 kHz/cm2 in large part of detectors ! main thrust of our detector design studies
17-19 January 2005 5th BMBF-JINR Workshop, Walter F.J. Müller, GSI 20
CBM DAQ Requirements Profile
D and J/Ψ signal drives the rate capability requirements D signal drives FEE and DAQ/Trigger requirements
Problem similar to B detection, see BTeV, LHCb Adopted approach:
displaced vertex 'trigger' in first level, like in BTeV Additional Problem:
DC beam → interactions at random times
→ time stamps with ns precision needed
→ explicit event association needed Current design for FEE and DAQ/Trigger:
Self-triggered FEE: All hits shipped with time stamp Data-push architecture: L1 trigger throughput limited but
not latency limited
Quitedifferentfrom the
usualLHC style
electronics
Substantial R&D
needed
17-19 January 2005 5th BMBF-JINR Workshop, Walter F.J. Müller, GSI 21
Conventional FEE-DAQ-Trigger Layout Detector
Cave
Shack
FEE
Buffer
L2 Trigger L1 Trigger
DAQ
L1 A
ccep
t
L0 Trigger
fbunch
Archive
Trigger
Primitives
Especially
instrumented
detectors
Dedicated
connections
Specialized
trigger
hardware
Limited
capacity
Limited
L1 trigger
latency
Modest
bandwidth
Standard
hardware
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L1 SelectFPGA andCPU mix
High
bandwidth
The way out: use Data Push Architecture Detector
Cave
Shack
FEE
DAQ
fclock
L2 Select
Self-triggered front-end
Autonomous hit detection
No dedicated trigger connectivity
All detectors can contribute to L1
Large buffer depth available
System is throughput-limited
and not latency-limitedModular design:
Few multi-purpose rather
many special-purpose
modules
17-19 January 2005 5th BMBF-JINR Workshop, Walter F.J. Müller, GSI 23
Toward Multi-Purpose FEE Chain
PreAmpPreAmp preFilter
preFilter ADCADC Hit
Finder
Hit
Finderdigital
Filter
digital
FilterBackend
& Driver
Backend
& Driver
Si Strip Pad GEM's PMT APD's
Anti-Aliasing
Filter
Sample rate:
10-100 MHz
Dyn. range:
8...>12 bit
'Shaping'
1/t Tailcancellation
Baselinerestorer
Hit
parameter
estimators:
Amplitude
Time
Clustering
Buffering
Link protocol
All potentially in one mixed-signal chip
17-19 January 2005 5th BMBF-JINR Workshop, Walter F.J. Müller, GSI 24
CBM DAQ and Online Event Selection
Data flow:
~ 1 TB/sec
1st levelselection:
~ 1 Pops
Data flow:
~ 1 GB/sec
17-19 January 2005 5th BMBF-JINR Workshop, Walter F.J. Müller, GSI
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CBM R&D working packages Feasibility studies Simulations
D Kπ(π)GSI Darmstadt, Czech Acad. Sci., RezTechn. Univ. Prague
,ω, e+e-
Univ. KrakowJINR-LHE Dubna
J/ψ e+e-
INR MoscowGSI
π, K, p ID Heidelberg Univ,Warsaw Univ.Kiev Univ. NIPNE BucharestINR Moscow
FrameworkGSI
TrackingKIP Univ. HeidelbergUniv. MannheimJINR-LHE DubnaJINR-LIT Dubna
Design & constructionof detectors
Silicon PixelIReS StrasbourgFrankfurt Univ.,GSI Darmstadt,RBI Zagreb,Univ. Krakow
Silicon Strip Moscow State UnivCKBM St. PetersburgKRI St. PetersburgUniv. Obninsk
RPC-TOFLIP Coimbra, Univ. Santiago Univ. Heidelberg,GSI Darmstadt,Warsaw Univ.NIPNE BucharestINR MoscowFZ RossendorfIHEP ProtvinoITEP MoscowRBI ZagrebUniv. Marburg
MWPC TRDJINR-LHE, DubnaGSI Darmstadt,Univ. MünsterNIPNE Bucharest
Straw TRDJINR-LPP, DubnaFZ RossendorfFZ JülichTech. Univ. Warsaw
ECAL ITEP Moscow GSI DarmstadtUniv. Krakow
RICH IHEP Protvino GSI Darmstadt
KIP Univ. HeidelbergUniv. MannheimGSI DarmstadtJINR-LIT, DubnaUniv. BergenKFKI BudapestSilesia Univ. KatowiceWarsaw Univ.
MagnetJINR-LHE, DubnaGSI Darmstadt
FEE,DAQ,Online Event Selection,Computing
J/ψ μ+μ-
PNPi St. PetersburgSPU St. Petersburg
Λ, Ξ,Ω PNPi St. PetersburgSPU St. Petersburg
Ring finder JINR-LIT, Dubna
Theory:JINR-LTP, Dubna
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CBM – Event Reconstruction & Analysis
• Track finding•Hough transform•Cellular automaton•Conformal mapping•3D track following
• Track fitting•Kalman filter•Kalman filter (projections)•Parabolic approximation•Polynomial approximation•Orthogonal polynomial set
• Primary vertex fitting•Minimization of impact parameters•Geometrical Kalman filter
• Secondary vertex fitting•Geometrical Kalman filter•Mass and topological constrained fit
• RICH ring finding•Track extrapolation•Hough transform•Elastic net•Robust fitter
LHELIT
LITLHELITLIT
LHE
LITLIT
LIT
• Analysis•.......•Λ-Analysis•low-mass dileptons•.......
LHELHE
17-19 January 2005 5th BMBF-JINR Workshop, Walter F.J. Müller, GSI 28
CBM – Fast Detectors (LHE)
Joint test beamat GSI in July '04
2 chambers from Dubna
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Observables:Penetrating probes: , , , J/ (vector mesons)Strangeness: K, , , , , Open charm: Do, D
Hadrons ( p, π), exotica
Experimental program of CBM:
Systematic investigations:A+A collisions from 8 to 45 (35) AGeV, Z/A=0.5 (0.4) p+A collisions from 8 to 90 GeVp+p collisions from 8 to 90 GeVBeam energies up to 8 AGeV: HADES
Large integrated luminosity:High beam intensity and duty cycle,Available for several month per year
Detector requirementsLarge geometrical acceptance good hadron and electron identificationexcellent vertex resolutionhigh rate capability of detectors, FEE and DAQ
e+e- ?
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Stay tuned for
Part II
by
Prof. A. Malakhov