1. 24 May 2008V.Kekelidze, CC NICA/MPD1  Collider versus Fixed Target  Towards 4  acceptance  Working groups - EC  TPC - EC tracking (examples)  Plans MultiPurpose Detector (project status) V. Kekelidze

2. 24 May 2008V.Kekelidze, CC NICA/MPD2 Collider versus Fixed target  Direct photons & e+e- observables - no thick-target effects could be crucial for some observables  Energy scanning - smooth acceptance variation - no track/cluster density saturation due to limited separation/resolution feasibility  Hadronic observables - 4  geometry  extended  - reliable observable-spectator separation -  & centrality online definition for trigger reasons and …

3. 24 May 2008V.Kekelidze, CC NICA/MPD3  longitudinal (z-axis) space limited by ~ 800 cm between the collider optics  radial scale limited by engineering problems & cost (R < 200 cm) Initial constrains: MPD – conceptual design Solution:  compact solenoid with the major parts of detector located in the magnetic field  design of superconducting magnet with closed yoke geometry to provide homogeneous magnetic field

4. 24 May 2008V.Kekelidze, CC NICA/MPD4 General View MPD – conceptual design

5. 24 May 2008V.Kekelidze, CC NICA/MPD5  Au + Au collisions with max. total energy of 4.5 + 4.5 GeV/u  Central interaction within b: 0 – 3 fm  Minimum bias within b: 0 – 15.8 fm  Collision rate at L=10 27 cm -2 s -1 : ~ 6 kHz Simulation First stage of simulation based on UrQMD & GEANT4 in the framework of the MPD-Root shell:

6. 24 May 2008V.Kekelidze, CC NICA/MPD6 Charged particles Multiplicity Observables

7. 24 May 2008V.Kekelidze, CC NICA/MPD7 Pseudorapidity spectra Observables

8. 24 May 2008V.Kekelidze, CC NICA/MPD8 Observables Fig.6 Pulse spectra of pions, kaons and protons in different regions of the pseudorapidity of MPD detector. Spectrum of the primary protons is presented for demonstration that the low energy peak on the spectrum of all protons is due to secondary protons created in the matter before TOF in both Barrel and End cap regions. Charged particles momenta

9. 24 May 2008V.Kekelidze, CC NICA/MPD9 to cover a wider pseudorapidity range Very EndCap Barrel EndCap Very Forward Towards 4  acceptance

10. 24 May 2008V.Kekelidze, CC NICA/MPD10 Working groups IT Yu.Murin, V.Nikitin TPC Yu.Zanevsky TOF V.Golovatyuk ECT -V.Peshekhonov -Yu.Kiryshin Magnet V.Borisov Engineering A.Shabunov ZDC A.Kurepin, INR EMC I.Tyapkin Direct  e+e- LNP BBC, Stop-Start tracking A.Zinchenko Soft support O.Rogachevsky MC geometry MC structure EC Weekly meetings Consortium CBM June meeting in Protvino

11. 24 May 2008V.Kekelidze, CC NICA/MPD11 HV-electrode ~20 KV 12 Readout chambers Field cage ~80 000 readout channels beam 24 μs E TPC – construction design

12. 24 May 2008V.Kekelidze, CC NICA/MPD12 TPC – simulation structure |ŋ|<1 0.1GeV/c < P t <3GeV/c B=0.5T B r / B z ≤ 10 -4 Ar / CH4 90 / 10 Drift velocity 5.5cm/µs longitudinal diffusion ~ 320 µm/cm 1/2 transverse diffusion ~ 185µm/cm 1/2

13. 24 May 2008V.Kekelidze, CC NICA/MPD13 EndCap

14. 24 May 2008V.Kekelidze, CC NICA/MPD14  End Cap Tracker Straw Wheels (stereo radial) MPD MPD End-Cap parts for tracking & momentum reconstruction + particle ID at 1< |  |< 2.65  Time Of Flight RPC (+ start/stop sys.) for charged particle ID  Electromagnetic Calorimeter crystal / shashlyk - for e, ,  0 reconstruction

15. 24 May 2008V.Kekelidze, CC NICA/MPD15 ECT straw wheel Number of track hits = f(R) is related to reconstruction efficiency Pseudorapidity correlation with track hit numbers Multiplex solution: set of wheels each rotated by extra  to fill the circle 

16. 24 May 2008V.Kekelidze, CC NICA/MPD16 RPC EndCap η< 2.00 η > 1.1 η< 2.65 occupancy /straw < 15 %

17. 24 May 2008V.Kekelidze, CC NICA/MPD17  = 1.1 acceptance

18. 24 May 2008V.Kekelidze, CC NICA/MPD18 1.1 % 1.7 % Resolution improvement

19. 24 May 2008V.Kekelidze, CC NICA/MPD19 Time of Flight barrel region charged particle mass reconstruction EndCap region

20. 24 May 2008V.Kekelidze, CC NICA/MPD20 MPD Collaboration Joint Institute for Nuclear Research Institute for Nuclear Research, RAS Nuclear Physics Institute of MSU Bogolyubov Institute for Theoretical Physics, NAS, Ukraine Institute for Applied Physics, AS of Moldova

21. 24 May 2008V.Kekelidze, CC NICA/MPD21 Plans  Extension of the partnership - MoU’s in preparation: JINR-GSI JINR-FAIR JINR-Frankfurt University  Strengthening the MPD collaboration -final cost estimation -definition of proper responsibilities  Detail planning preparation - development of the manager software - coordination with the accelerator plans  Extensive R&D in 2008 -2009 - the final MPD configuration with possible staging - towards the MPD TDR  Spin Physics Detector (at second interaction point) - LoI in preparation - A.Nagaitsev, O.Shevchenko

22. 24 May 2008V.Kekelidze, CC NICA/MPD22 Spare

23. 24 May 2008V.Kekelidze, CC NICA/MPD23 Electromagnetic Calorimeter 500 < p < 1000 MeV/c  = 1.0%/  E  = 2.5%/  E  = 5.0%/  E  = 10.0%/  E 0 200 400 600 120 130 140 150 M(  ), MeV/c 2 Requirements for  0 reconstruction

24. 24 May 2008V.Kekelidze, CC NICA/MPD24 ECT straw wheel Stereo wheel construction: each stereo wheel contains 4 layers of radial straws with different orientation P = 1.5 GeV/c,  =1.5  =2.2 %  = 1.00 - 2.65

25. 24 May 2008V.Kekelidze, CC NICA/MPD25 Track reconstruction efficiency TPC ECT ECT complements TPC to extend pseudorapidity range