the project nica/mpd at jinr (dubna) search for the mixed phase of strongly interacting matter at...

The Project NICAMPD at JINR (Dubna)

Search for the Mixed Phase of Strongly Interacting Matter at

NNuclotron-based uclotron-based IIon on CCollider ollider FFAAcilitycility

(115)1027Average luminosity L [cm-2s-1]

21027Peak luminosity L [cm-2s-1]

0009Beam-beam parameter

00044Laslett tune shift Q

200RF voltage URF [kV]

05Beta function at interaction points m

100IBS life time [sec]

0001Momentum spread pp

07Horizontal emittance [ mm mrad]

20Bunch number nbunch

20109Particle number per bunch Nionbunch

135Ion kinetic energy E [GeVu] minmax

2512Ring circumference m

Collider parameters

The Joint Institute for Nuclear Research (JINR) in Dubna is an international research organization established in accordance with the intergovernmental agreement of 11 countries in 1956 At the present time eighteen countries are the JINR Member States JINR has an extensive and fruitful collaboration with Germany Hungary Italy and the Republic of South Africa having an Observer status at JINR and contributing their resources to projects of mutual interest After 50 years of scientific activity the Institute plays a world leading role in a number of branches of fundamental physics Long-term scientific cooperation is established with CERN and the main Laboratories of France the USA (Fermilab BNL TJNL LBL) and many other countries The largest number of collaborative investigations are carried out with Russian research centers

The JINR research program in high energy particle and nuclear physics is carried out mainly at the accelerator facilities of other Laboratories IHEP (Protvino) INR RAS (Troitsk) ITEP (Moscow) PI RAS (Moscow) BINP (Novosibirsk) Russian Research Center ldquoKurchatov Instituterdquo SINP MSU (Moscow) PNPI RAS (Gatchina) CERN FNAL and BNL (USA) GSI and DESY (Germany) and others The JINR basic facility for high-energy physics research is represented by the 6 AGeV Nuclotron which has replaced the old weak focusing 10 GeV proton accelerator Synchrophasotron The first relativistic nuclear beams with an energy of 42 AGeV were obtained at the Synchrophasotron in 1971 Since that time the study of relativistic heavy ion physics problems has been one of the main directions of the JINR research program

2 x 41010 ions of 238U92+

t

35 GeVu500 MeVu5 MeVu300 keVu20 keVu

electroncooling5 cycles

of injection

2x20 cycles of injection

KRION RFQ LINAC Booster Nuclotron Collider

EionA

Time Table of The Storage Process

8s 01s 1s 2s 2 min

MPD for the Mixed Phase experiment The experimental set-up of proposed MPD has to perform tracking of high multiplicity events and particle identification The tracking system both the vertex tracker based on silicon strip detectors and Central Tracking System based on gaseous tracking devices These detectors are optimized for determination of the primary and secondary vertices and for precise tracking of low-momentum particles All tracking detectors (SVS CTS and FTS) are situated in the magnetic field of 1 T which is parallel to a beam direction The detectors record the tracks of charged particles measure their momenta and identify particles by measuring their ionization energy loss (dEdx) with a good resolution The Time Projection Chamber is an appropriate detector for reconstruction of events with high density tracks For identification of secondary particles it is proposed to use Time of Flight Detectors The Time of Flight array provides pion kaon and proton identification

350 cm

25 cm

TOF Start

TOF RPC Stop

TOF Start

Tracker

SVT 4 planes

ECal

Interaction region ~50 cm

Forward ECAL

30 cm

ZDC

200 cm

200 cm

Scheme of MPD detector

Beam Beam

Superconducting coil

Accelerator quad

Accelerator quad

Some basic parameters of MPD detector

bull Interaction rate of Pb+Pb events at beams luminosity 1027 cm-2s-1 is 10 kHz Interaction rate of central events is 500 s It is assumed that DAC system is capable to readout and store this data

bull The accuracy of vertex positioning by means of silicon vertexdetector is better then 02 mm

bull The TPC produces 30 hits on track and provides momentum measurement accuracy 1 in the range p = 02 ndash 2 GeVc

bull RPC time of flight system has time resolution 80 ps and provides π-К separation with probability 5 for p lt 2 GeVc At low momenta p lt 07 GeVc all particle identification is achieved by ionization measurement in TPC

The detector architecture is typical for collidersbull The nearest to the beam device is vertex silicon strip detector with pitch 02 mm bull The barrel detector is TPC Version of the drift tubes tracker is also consideredbull There are barrel TOF RPC systembull There are barrel and two end cup EM calorimetersbull Magnetic field 05 T parallel to the beam axis is provided by two superconducting coilsbull Two near the beam sets of scintillator counters used as start devices for TOF measurements and on-line vertex positioningbull There are two ZDC calorimeters

Superconducting Proton Synchrotron ldquoNuclotronrdquobullThe Nuclotron 6 AmiddotGeV synchrotron based on unique fast-cycling superferric magnets was designed and constructed at JINR (1987-1992) and commissioned in March 1993 The annual running time of 2000 hours is provided during the last years

bullIon beams up to krypton and polarized deuterons have been accelerated and extracted from the accelerator

bullUnique technology of highly charged state ion sources (KRION-type) based on ionization by electron impact is developed The ions up to Au have been obtained at the test bench

The Project MilestonesStage 1 years 2007 ndash 2008 - Development of the Nuclotron facility - Preparation of Technical Design Report - Start prototyping of the MPD and NICA elementsStage 2 years 2008 ndash 2011 - Design and Construction of NICA and MPD detector Stage 3 years 2011 ndash 2012 - AssemblingStage 4 year 2013 - Commissioning

Preinjector + Linac in collaboration with IHEP (Protvino)

TOF

Initial colliding nuclei Interaction Freeze-out

Basement of Synchrophasotron

Booster

BoosterDipole magnet

NICA scheme

Booster (30 Tm)5 single-turn injections

storage of 8times109 at electron cooling

bunching amp accelerationup to 590 MeVu

Nuclotron (45) Tm)injection of one bunch

of 3times109 ionsacceleration up to

35 GeVu max

Collider (37 45 Tm)Storage of

20 bunches 25109 ions per ring at 35 GeVu max

electron andor stochastic cooling

Injector 2times109 ionspulse of 238U30+ at energy 5 MeVu

IP-1 IP-2

Stripping (eff 40) 238U32+ 238U92+

Two collider rings

2x20 injection cycles

A N Sisakian for NICA collaboration

NICA Layout

MPD

Phase trajectories in the phase diagram calculated within the 3-fluid hydrodynamic model for central Au+Au collisions at different energies (Yu Ivanov VN Russkikh VD Toneev 2005 AN Sissakian AS Sorin MK Suleymanov VD Toneev GM Zinovjev 2005 2006) Freeze-out curve is shown by dots the shaded region is a mixed phase for baryon and strange conserved charges For Elab = 30 AGeV (sNN = 8 GeV) the trajectory goes near

the critical end-point Points with numbers indicate the time of the system evolution (1 fmc ~ 33middot10-24 sec)

NICA