CBM at FAIR

Walter F.J. Müller, GSI

5th BMBF-JINR Workshop, 17-19 January 2005

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

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Probing matter at high densities

Trajectories calculated by a 3-fluid hydrodynamics modelToneev & Ivanov

30 AGeV trajectory close to critical endpoint

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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)

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Phase diagram of strongly interacting matter

CERN-SPS, RHIC, LHC: high temperature, low baryon densityGSI SIS300: moderate temperature, high baryon density

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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 ?

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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 !

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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

17-19 January 2005 5th BMBF-JINR Workshop, Walter F.J. Müller, GSI 14

CBM Technical Status Report

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

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CBM & Дубна

From first page

of CBM

Collaboration List

4 Labs38 Persons

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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-

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Pion misidentification

a)0% b)0.01%

c)0.1% d)1%

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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

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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

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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

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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

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CBM DAQ and Online Event Selection

Data flow:

~ 1 TB/sec

1st levelselection:

~ 1 Pops

Data flow:

~ 1 GB/sec

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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

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CBM – Magnet Design (LHE)

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CBM – Fast Detectors (LHE)

Joint test beamat GSI in July '04

2 chambers from Dubna

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CBM – Straw based TRD (LPP)

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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

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