The Compressed Baryonic Matter Experiment at the Future Facility for Antiproton and Ion Research (FAIR) utline: FAIR: future center for nuclear and hadron physics Compressed Baryonic Matter: physics and observabl Technical challenges, time lines ... Peter Senger
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The Compressed Baryonic Matter Experiment at the Future Facility for Antiproton and Ion Research (FAIR)
The Compressed Baryonic Matter Experiment at the Future Facility for Antiproton and Ion Research (FAIR) . Peter Senger. Outline: FAIR: future center for nuclear and hadron physics in Europe Compressed Baryonic Matter: physics and observables Technical challenges, time lines . - PowerPoint PPT Presentation
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The Compressed Baryonic Matter Experimentat the Future Facility for Antiproton and Ion Research (FAIR)
Outline:
FAIR: future center for nuclear and hadron physics in Europe Compressed Baryonic Matter: physics and observables Technical challenges, time lines ...
Peter Senger
SIS 100 TmSIS 300 TmU: 35 AGeV p: 90 GeV
Structure of Nuclei far from Stability
Cooled antiproton beams up to 15 GeV:Charmonium Spectroscopy,Search for glueballs and hybrids,Hypernuclear physics, ...
Compressed Baryonic Matter
The FAIR layout
Key features:Generation of intense, high-quality secondary beams of rare isotopes and antiprotons.Two rings: simultaneous beams.
Ion and Laser Induced Plasmas: High Energy Density in Matter
Exploring the phase diagram of strongly interacting matter
CERN-SPS, RHIC, LHC: high temperature, low baryon densityGSI SIS300: moderate temperature, high baryon density
The critical end point
Ejiri et al.Fodor-Katz
Cross over
1st order transition
Mapping the QCD phase diagram with heavy-ion collisions
CBM physics:exploring the high density regionof the QCD phase diagram.
Search for• restoration of chiral symmetry• partonic matter at large μB • critical endpoint
Dense baryon-dominated matter
Meson-dominatedmatter
B 3-80 , T 130 MeV
Fundamental questions:
Equation-of-state at high densities: supernova dynamics, stability of neutron stars
In-medium hadron properties: chiral symmetry restoration, origin of hadron masses?
deconfinement
Diagnostic probes
CBM physics topics and observables 1. In-medium modifications of hadrons onset of chiral symmetry restoration at high B
measure: , , e+e- open charm (D mesons) 2. Strangeness in matter (strange matter?) enhanced strangeness production ? measure: K, , , , 3. Indications for deconfinement at high B anomalous charmonium suppression ? measure: J/, D softening of EOS measure flow excitation function 4. Critical point event-by-event fluctuations 5. Color superconductivity precursor effects ?
pn
++
K
e+
e-
p
Looking into the fireball …
… using penetrating probes:
short-lived vector mesons decaying into electron-positron pairs
Invariant mass of electron-positron pairs from Pb+Au at 40 AGeVCERES Collaboration S. Damjanovic and K. Filimonov, nucl-ex/0109017
≈185 pairs!
Statistical hadron gas modelP. Braun-Munzinger et al.
Nucl. Phys. A 697 (2002) 902
Experimental situation : Strangeness enhancement ?Experimental situation : Strangeness production
in central Au+Au and Pb+Pb collisions
New results from NA49 (CERN Courier Oct. 2003) SIS100300
Measure displaced vertex with resolution of 30 μm !
Experimental challenges
107 Au+Au reactions/sec (beam intensities up to 109 ions/sec, 1 % interaction 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 400 -
400 + 44 K+ 13 K-
The CBM Experiment
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: electromagn. calorimeter (ECAL) High speed data acquisition and trigger system
CBM Collaboration : 39 institutions, 14 countriesCroatia: RBI, Zagreb
Russia:CKBM, St. PetersburgIHEP ProtvinoINR TroitzkITEP MoscowKRI, St. PetersburgKurchatov Inst., MoscowLHE, JINR DubnaLPP, JINR DubnaLIT, JINR DubnaObninsk State Univ.PNPI GatchinaSINP, Moscow State Univ. St. Petersburg Polytec. U.
Spain: Santiago de Compostela Univ. Ukraine: Shevshenko Univ. , KievUniv. of Kharkov
Civil Construction Production and Installation *SIS200 installation during SIS100 shut down
MIMOSA IV
IReS / LEPSI Strasbourg
Design of a Silicon Pixel detector
Design goals: • low materal budget: d < 200 μm • single hit resolution < 20 μm• radiation hard (dose 1015 neq/cm2)• fast read out
Silicon Tracking System: 7 planar layers of pixels/strips.Vertex tracking by two first pixel layers at 5 cm and 10 cm downstream target
Roadmap:R&D on Monolithic Active Pixel Sensors (MAPS)• pitch 20 μm• thickness below 100 μm • single hit resolution : 3 μm• Problem: radiation hardness and readout speed
Fallback solution: Hybrid detectors
Hit rates for 107 minimum bias Au+Au collisions at 25 AGeV:
Experimental conditions
Rates of > 10 kHz/cm2 in large part of detectors ! main thrust of our detector design studies
Design of a high rate RPCDesign goals: • Time resolution ≤ 80 ps• High rate capability up to 25 kHz/cm2• Efficiency > 95 %• Large area 150 m2• Long term stability
Prototype test:detector with plastic electrodes(resistivity 109 Ohm cm.)P. Fonte, Coimbra
“Trajectories” (3 fluid hydro)
Hadron gas EOS
Ivanov & Toneev
Calculations reproduce freeze-out conditions
30 AGeV trajectoryclose to the critical endpoint
Mapping the QCD phase diagram with heavy-ion collisions