A.Litvinenko VBLHEP JINR 1 The Current status of the MPD@NICA Project at JINR A.Litvinenko for MPD@NICA collaboration [email protected]

A.Litvinenko VBLHEP JINR

1

The Current status of the MPD@NICA Project

at JINR

A.Litvinenko for MPD@NICA collaboration

[email protected]


2

MPD@NICA Project

(

The Multi Purpose Detector(MPD) is designed to studyHeavy Ion collisions at the Nuclotron-based heavy IonCollider fAcility(NICA) at JINR, Dubna.


3

MotivationObservablesDetector conceptionSimulation of some tasksConclusionsConclusions

OutlineOutline


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MPD@NICA Project

(

The Multi Purpose Detector(MPD) is designed to studyHeavy Ion collisions at the Nuclotron-based heavy IonCollider fAcility(NICA) at JINR, Dubna.

Colliding nuclei up to the Au

Energy

Luminosity

GeV 11÷ 4 = SNN

-1-227 s cm 10= L(AuAu)


5

http://nica.jinr.ru/

http://nica.jinr.ru/files/CDR_MPD/MPD_CDR_en.pdf

http://nica.jinr.ru/files/WhitePaper.pdf


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NICASYNCHROPHASOTRON

NUCLOTRONFix. Targ.

Experiments

MPD


7

MPD general view


8

Some historyE

nerg

y

Time

;GeV=S;AGS NN 5

GeV=S;SPS NN 17

GeV=S;RHIC NN 200

TeV 2.76=SLHC;NN

NA-49NA-61

NICA

PHENIX

STAR

CBMGeV 11÷ 4 SNN =


9

Why the initial energy ?GeV 11÷ 4 = SNN

Parameter of Fireball (Parameters of exited hadronic matter)

1. Baryon density

2. Energy density (Bjorken equation)

3 GeV/fm=ε;GeV=S;Au+Au:AGSBjNN 1.5 5

3 GeV/fm 2.9 17 =ε;GeV=S;Pb+Pb:SPSBjNN

3 5.4 200 fm/GeV=ε;GeV=S;Au+Au:RHICBjNN

Energy density increases with increasing initial energyBaryon density decreases with increasing initial energy

dy

dE

Sτ=

Sdy

mdN=)τ(ε T

.Form

T.FormBj

1


10

dy

dE

SSdy

mdNT

Form

TFormBj

..

1)(

PHOBOS DATA

Energy densitydensity of charged hadrons


11

Baryon charge of fireball can be obtained from net-proton distribution

Net protons = ∑ )p-(p

By the way, is often used Stopping power

and


12

Lattice QCD

GeV17.0Tc

F. Karsch, Lecture Notes in Physics 583 (2002) 209.

RHIC Energy

Small baryon density


13

Rough estimation – ideal mass less gas

Bosons -- 1- degree of freedom:

423

02

4B T

301)T/exp(d

1).Fm(

8

7T

301)T/exp(d

1).Fm( 4

23

02

4F

Fermions -- 1- degree of freedom:

2 quarks

3 quarks


14

42

42

3037

30}82

87

3222{ TTcscqsfSB

42

42

305.47

30}82

87

3223{ TTcscqsfSB

For

GeVTc 17.0

3/ 26.12 fmGeVN SBf 3/ 6.13 fmGeVN SBf


15

Creation of the deconfirment QGP state in heavy-ion collisions,

Kind of transition depends on the net baryon density

high baryon density first order transition to QGP


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The horn in strangeness yield NA-49 data


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There is experimental indication on singularity at NICA energy The initial energy scan is necessary for determination of EoS parameters It is interesting to know where is critical point The first order transition can give many interesting signals including signals from mixed phase.

Conclusions I


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Nuclei collisions complicated process. To study it we need a lot of observables.

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Space-time structure of heavy ions collisions

kinetic freeze-out(no collisions)

Chemical freeze-out(no particles production)

Parton-parton interaction

Initial inelastic collisionsworld line


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Observables

Particles ratios temperature and chemical potential at Chemical Freezeout


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Observables

Particle spectra temperature and expansion velosityat Kinematic Freezeout


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elliptic flowelliptic flow

Coordinate space asymmetry momentum space anisotropy

22x

22x

2 y

y

pp

ppv

Space eccentricity Elliptic flow

...)2cos2cos21(2

121

vv

d

dN

22

22

yy

xx

Observables

Flows equilibrium time, EoS ….


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Observables

No hard collisions at small energy

Fluctuations: Multiplicities, Particle Ratios, mean pT …

Fluctuations from 1st order transition have to be more strong


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General view of the MPD

CD-central parts, (FS-A, FS-B) - two forward spectrometers (optional).Superconductor solenoid (SC Coil) and magnet yoke, inner detector (IT), straw-tube tracker

(ECT), time-projection chamber (TPC), time-of-flight stop counters (TOF), electromagnetic calorimeter (ECal), fast forward detectors (FFD), beam-beam counter (BBC), and zero degree

calorimeter(ZDC).


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Central Detector of MPD with based dimensions


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MPD pseudorapidity coverage.

The barrel part

21.|η| The endcaps

221 |η|.(FS-A and FS-B) 32 |η|


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Magnet of MPD

Distribution of the magnetic induction

T .Bz 50

The field inhomogeneity in the tracker area of the detector is about 0.1%.


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Detector simulation software packagesThe software framework for the MPD experiment (MpdRoot) is based on the object oriented framework FairRoot and provides a powerful tool for detector performance studies, development of algorithms for reconstruction and physics analysis of the data.

http://mpd.jinr.ru


29

Time projection chamber (TPC)

Schematic view

(tracking, PID)


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Simulation view of TPC in the MpdRoot.


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Tracks reconstruction

Charge particle tracks in the TPC volume for a central Au + Au collisionUrQMD 2.3


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Particle identification

Separation of particles in the TPC by ionization loss 21.|η|


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Inner Tracker System

(vertex reconstruction, secondary vertex reconstruction)


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Hyperons identification

Inner Tracker System

-- K

TPCTPC + ITS


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Time of Flight System (ToF)

PID (0.1–2 GeV/c) – ToF + TPC

Multigap Resistive Plate Counters (MRPC)

Barrel of TOF system

Distribution of RPC elements in the barrel


36

Time of Flight System (ToF)

PID with TOF and TPC


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Electromagnetic calorimeter

The “shashlyk” type calorimeter

Detector sector

sampling Pb(0.5 mm) + Sc(1.5 mm) (170 layers)

ECAL detector.

) (0.8 X Iλ016

the “shashlyk” calorimeter module


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Electromagnetic probes provide information about:

Early stage of collision

Temperature evolution of the system from its formation to thermal

freez-out

Comparison of resonanses properties as seen in dielectron

and hadronic decay channels in Au+Au collisions


39


40


41

The importance of the centrality classification

elliptic flow scaling with space eccentricity short equlibration time

Space eccentricityElliptic flow

...)+φcos+φcos+(π

=φd

dN2221

2

121 vv

ε=A 2

2

v

Nuclear Physics A V757, No. 1-2 , p.184,2005


42

LAQGSM, Sqrt(S)=5 GeV

Total kinetic energy of all nucleonsand fragments directed to ZDC

URQMD, Sqrt(S)=5 GeV


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The centrality determination: ZDC + number tracks in TPC

GeV 9 =SNN GeV 5 SNN =

Reaction plane peconstruction 44

Position of extZDC within MPD set-up

extZDC


Methods of reaction plane reconstruction

ixi

iyinuclR pw

pw

,

,, arctan

Method 1:

it

iyi

ii

iinuclR p

p

w

w

,

,, sin;cos

sinarctan

Method 2:

• Using 1-st Fourier harmonics → directed flow in a collision in Lab frame:

22

22

)(1)(1

)()()(

RnuclR

RRnuclR

nuclR

R

→ combine measurements for η<0 and η>0 to improve precision, study as a function of impact parameter b

→ Optimize weight wi to increase sensitivity to RP

b

φR


Directed Flow v1 vs Rapidity y

UrQMD QGSM

nucleons π-mesons


Extended ZDC detector

Simulation of extended ZDC within mpdroot:

• L = 120 (60, 40) cm

• 5 < R < 61 cm, z0=270 cm, 1<θ<12.5o (2.2<η<4.8)

• dcell = 5x5,10x10 cm

• wi=Σ Evis in active layers of 1 module → use methods 1 and 2 for RP reconstruction

• No π vs p/ion identification

• Geant 4 , QGSP_BIC physics model

dcell = 5x5 cm, 420 cells in each side of MPD

dcell = 10x10 cm, 121 cells in each side of MPD

Reaction plane reconstruction 48

Resolution δφRP and <cos δφRP> vs b

Effects of ZDC cell size and length, beam energy and interaction model


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Polarization observables at MPD. one example

Analyzing powers Ayy of the reactions:

D = + ↑p

↑n

S wave D wave

p

n

X A

XA

D

p


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Experimental data

C.E.Allgower et al., Phys.Rev. D 65 ,092008, (2002) Simulation for MPD


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Experimental data

C.E.Allgower et al., Phys.Rev. D 65 ,092008, (2002)(22 GeV)

Simulation for MPD

D.L. Adams et al., Phys. Lett. B 264, 462 (1991)200 GeV


52

MPD Collaboration

Joint Institute for Nuclear ResearchKh.U.Abraamyan, S.V.Afanasiev, V.S.Alfeev, N.Anfimov, D.Arkhipkin, P.Zh.Aslanyan, A.V.Averyanov, V.A.Babkin, S.N.Bazylev, D.Blaschke, D.N.Bogoslovsky, I.V.Boguslavski, A.V.Butenko, V.V.Chalyshev, S.P.Chernenko, Vl.F.Chepurnov, l.F.Chepurnov, G.A.Cheremukhina, I.E.Chirikov-Zorin, D.E.Donetz, K.Davkov, V.Davkov, D.K.Dryablov, D.Drnojan, V.B.Dunin, L.G.Efimov, A.A.Efremov, E.Egorov, D.D.Emelyanov, O.V.Fateev, Yu.I.Fedotov, A.V.Friesen, O.P.Gavrischuk, K.V.Gertsenberger, V.M.Golovatyuk, I.N.Goncharov, N.V.Gorbunov, Yu.A.Gornushkin, N.Grigalashvili, A.V.Guskov, A.Yu.Isupov, V.N.Jejer, M.G.Kadykov, M.Kapishin, A.O.Kechechyan, V.D.Kekelidze, G.D.Kekelidze, H.G.Khodzhibagiyan, Yu.T.Kiryushin, V.I.Kolesnikov, A.M.Korotkova, A.D.Kovalenko, N.D.Krahotin, Z.V.Krumshtein, N.A.Kuz’min, R.Lednicky, A.G.Litvinenko, E.I.Litvinenko, Yu.Yu.Lobanov, S.P.Lobastov, V.M.Lysan, L.Lytkin, J.Lukstins, V.M.Lucenko, D.T.Madigozhin, A.I.Malakhov, I.N.Meshkov, V.V.Mialkovski, I.I.Migulina, N.A.Molokanova, S.A.Movchan, Yu.A.Murin, G.J.Musulmanbekov, D.Nikitin, V.A.Nikitin, A.G.Olshevski, V.F.Peresedov, D.V.Peshekhonov, V.D.Peshekhonov, I.A.Polenkevich, Yu.K.Potrebenikov, V.S.Pronskikh, A.M.Raportirenko, S.V.Razin, O.V.Rogachevsky, A.B.Sadovsky, Z.Sadygov, R.A.Salmin, A.A.Savenkov,W.Scheinast, S.V.Sergeev, B.G.Shchinov, A.V.Shabunov, A.O.Sidorin, I.V.Slepnev, V.M.Slepnev, I.P.Slepov, A.S.Sorin, O.V.Teryaev, V.V.Tichomirov, V.D.Toneev, N.D.Topilin, G.V.Trubnikov, I.A.Tyapkin, N.M.Vladimirova, A.S.Vodop’yanov, S.V.Volgin, A.S.Yukaev, V.I.Yurevich, Yu.V.Zanevsky, A.I.Zinchenko, V.N.Zrjuev, Yu.R.Zulkarneeva


53

MPD Collaboration

Institute for Nuclear Research, RAS, RFV.A.Matveev, M.B.Golubeva, F.F.Guber, A.P.Ivashkin, L.V.Kravchuck, A.B.Kurepin, .L.Karavicheva, A.I.Maevskaya, A.I.Reshetin, E.A.Usenko

Skobeltsyn Institute of Nuclear Physics Moscow State UniversityE.E.Boos, V.L.Korotkikh, I.P.Lokhtin, L.V.Malinina, M.M.Merkin, S.V.Petrushanko, L.I.Sarycheva, A.M.Snigirev, A.G.Voronin

Institute for Theoretical Experimental Physics, Moscow, RussiaO.A.Denisovskaia, K.R.Mikhailov, P.A.Polozov, M.S.Prokudin, G.B.Sharkov, A.V.Stavinskiy, V.L.Stolin, S.S.Tolstoukhov

St.Petersburg State UniversityS.Igolkin, G.Feofilov, V.Zherebchevskiy, V.Lazarev

Institute for Nuclear Reseach & Nuclear Energy BAS, Sofia, BulgariaI.Stamenov, I.Geshkov

Institute for Scintillation Materials, Kharkov, UkraineD.A.Bliznyuk, B.V.Grinyov, P.N.Zhmurin


54

MPD Collaboration

State Enterprise Scientific & Technology Research Institute for Apparatusconstruction, Kharkov, Ukraine

V.N.Borshchov, O.M.Listratenko, M.A.Protsenko, I.T.Tymchuk

Particle Physics Center of Belarusian State UniversityN.M.Shumeiko, F.Zazulia

Department of Engineering Physics, Tsinghua University, Beijing, ChinaCheng Li, Hongfang Chen, Ming Shao, Xiaoliang Wang, Yongjie Sun, Zebo Tang

Physics Institute Az.AS, AzerbaidjanO.Abdinov, M.Suleimanov

”Neva-Magnet” S&E, ltd, St-Petersburg, RussiaT.K.Koshurnikov

"HORIA HULUBEI National Institute of R&D for Physics and Nuclear Engineering", IFIN-HH, Bucharest, ROMANIAM.Apostol, F.Constantin, I.Cruceru, M.Cruceru


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Conclusuions II

Simulations and R&D are in a progress There is a big collaboration around the MPD project ZDC, ECAL and ToF prototypes are ready for the beam test Welcome to MPD Collaboration


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Thank you


57

Backup slidesBackup slides


58


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A conceptual design of the Multi-Purpose Detector to be built for the heavy-ion experimental program at JINR (Dubna) has been briefly described. The MPD comprises a tracking system based on TPC and ITS built of double-sided silicon microstrip detectors. Identification of charged hadrons is performed by a time-of-flight system based on mRPC technology; electrons and gammas are detected by a shashlyk-type electromagnetic calorimeter.


60

NICA Physics. Electromagnetic probes (dileptons)

60

Changes of the particle properties (broadening of spectral functions)in hot and dense medium. NICA is well situated to study in-medium effects due to highest baryon densities.

3.0

2.5

2.0

1.5

1.0

0.5

0.0

Rat

io

0.0 0.2 0.4 0.6 0.8 1.0 mee (GeV/c2)

PLB 666 (2008) 425

HSD model : ratio of modified by medium to free di-electron spectra

Energy range (NICA): Onset of the low-mass pair enhancement. Study the effect under highest baryon density conditions


61

Lattice QCD

GeV17.0Tc

F. Karsch, Lecture Notes in Physics 583 (2002) 209.

RHIC Energy

Small baryon density


62

42

42

3037

30}82

87

3222{ TTcscqsfSB

42

42

305.47

30}82

87

3223{ TTcscqsfSB

For

GeVTc 17.0

3/ 26.12 fmGeVN SBf 3/ 6.13 fmGeVN SBf


63

Rough estimation – ideal mass less gas

Bosons -- 1- degree of freedom:

423

02

4B T

301)T/exp(d

1).Fm(

8

7T

301)T/exp(d

1).Fm( 4

23

02

4F

Fermions -- 1- degree of freedom:

2 quarks

3 quarks


64

Why the collisions of heavy nuclei are interesting?

Let us see on the space–time picture of collision

pre-collision QGP (?) and parton production

hadron production

hadron reinteraction

QCD phase diagram


65

Observables

Correlation Femtoscopy (HBT) space-time characteristics

Weak energy dependence centrality 0-5%


66

Observables

No hard collisions at small energy

Hard processes ( Jet Quenching, resonances melting)

Fluctuations: Multiplicities, Particle Ratios, mean pT …

Fluctuations from 1st order transition have to be more stronge


67


68


69


70

Centrality determination in some experiment

y=0 y=3y>6

STARPHENIXNA49

NA49 ZDC Only

STAR TPC only

PHENIX BBC & ZDC


71

Observables and space time structureObservables and space time structure of of Heavy ion collisionsHeavy ion collisions

Production of hard particles: jets heavy quarks direct photonsCalculable with the tools of perturbative QCD


72


Production of semi-hard particles: gluons, light quarks relatively small momentum: make up for most of the multilplicity

cGeVpT / 21


73


Thermalizationexperiment suggest a fast thermalization (remember elliptic flow)but this is still not undestood from QCD


74


Quark gluon plasma


75


Hot hadron gas


76

Particle ratio and sParticle ratio and statistical modelstatistical models

These models reproduce the ratios of particle yields with only two parameters

One assumes that particles are produced by a thermalized system with temperature T and baryon chemical potential

The number of particles of mass m per unit volume is :


77

TIME = 0 fm/c, 0.7


78

TIME = 1 fm/c, 0.6


79

TIME = 2 fm/c, 0.5


80

TIME = 3 fm/c, 0.3


81

Alexander Kozlov QM’05(For the PHENIX collaboration)

Comparison of Φ meson properties as seen in dielectron and hadronicdecay channels in Au+Au collisions by PHENIX at RHIC


82

Electron pairs.

82

PLB 666 (2008) 425


83

Electromagnetic calorimeter

Neutrons in addition to electrons and Photons

The efficiency of neutron registration as function

of neutron kinetic energy.Relative resolution for neutron momentum


84

Baryon charge of fireball can be obtained from net-proton distribution

Stopping power

Net protons ∑ )pp(=protonsnet --

Documents

A.Litvinenko VBLHEP JINR 1 The Current status of the MPD@NICA Project at JINR A.Litvinenko for MPD@NICA collaboration [email protected]