Physics objectives

1
MultiPurpose Detector MPD Status Report
NICA Round Table III Dubna, 5-6 November
2008 V.Kekelidze

• Introduction
• Physics objectives
• First approach to MPD concept
• Progress in MPD project preparation
• - software environment MPDROOT
• - activity of physics groups
• - End-Cap concept development
• - progress in RD of detectors
• - IT infrastructure
• Plans for 2009
• Conclusions

2
Introduction

• The new JINR accelerator facility NICA will
  provide
• collisions of a variety of ions (from p to U92),
  
• with max energy ?SNN 9 GeV
• mean luminosity of L1027 cm-2s-1 (for UU
  collision)

• It will allow to study in-medium properties of
  hadrons and nuclear matter equation of state
  including a search for possible manifestation of
  de-confinement and/or chiral symmetry
  restoration, phase transition QCD critical
  end-point
• in the energy region of ?SNN 3-9 GeV

3
Introduction

• the Multi Purpose Detector MPD should be designed
  
• and constructed to carry out these relevant
  researches

• at the first stage of experiment it was proposed
  to study hadron productions in various ion
  interactions
• on energy centrality scanning

• leptonic probes - feasibility is under study
• probably requires a dedicated experiment

4
MPD experiment first stage objectives

• Event-by-event fluctuation in hadron productions
  
• (multiplicity, Pt etc.)
• HBT correlations indicating the space-time size
  of the systems involving p, K, p, ?
• (possible changes close to the de-confinement
  point)
• Multi-strange hyperon production
• yield spectra (the probes of nuclear media
  phases)
• Directed elliptic flows for various hadrons
• .

5
MPD Project Preparation

• The first LoI version is available

• MPD conceptual design is proposed with an
  acceptance close to 4p
• Alternative solutions are indicated for some of
  the subdetectors taking into account possible
  sharing of commitments by potential collaborators
• organization of the corresponding Collaboration
  is in progress

• The MPD Collaboration
• Joint Institute for Nuclear Research
• Institute for Nuclear Research, RAS, RF
• Bogolyubov Institute for Theoretical
• Physics, NAS, Ukraine
• Nuclear Physics Institute of MSU, RF
• Institute of Applied Physics, AS, Moldova
• new members are welcome to join

A consortium was organized involving GSI, JINR
other centers, for the IT module development
6
MPD conceptual design
General View

• 0.5T solenoid with closed yoke
• Major tracker - TPC
• Inner Tracker - silicon strips
• for tracking close to the interaction region
• Outer Tracker
• straw barrel (optional)
• Time Of Flight RPC
• ( start/stop sys.)
• for charged particle ID
• ECAL shashlyk type
• for e, ?, ?0 reconstruction
• End Cap Tracker
• to cover enlarged ? region
• - challenging task
• for tracking in solenoid field

7
Further Progress in Project Preparation
directions of activity

• development of theoretical models corresponding
  generators
• A.Sorin, V.Skokov, V.Toneev, K.Gudima,I.Mandjavidz
  e, J.Musulmanbekov et al.

• maintenance development of software environment
  - MPDROOT
• group of O.Rogachevsky

• Detector concept optimization for various physics
  tasks
• charged hadron production- D.Arkhipkin
  et al.
• ?, ?0 and hyperon production A.Kechechyan,
  M.Tokarev et al.
• leptonic observables A.Olchevsky, I.Tyapkin
  et. al.
• other groups leaders to be
  identified

• End-Cap concept development
• O.Rogachevsky, V.Golovatyuk, A.Zinchenko,
  D.Arkhipkin,
• V.Peshekhonov, Yu.Kiryushin et al.

8
Further Progress in Project Preparation
directions of activity

• detector RD progressing in many groups

• beam test facility preparation plans
  under discussion
• E.Strokovsky, G.Trubnikov, A.Kovalenko

• IT infrastructure development Yu.
  Potrebenikov et al.
• management program corresponding software
  preparation
• Yu.Potrebenikov, D.Madigozhin, N.Molokanova

• MPD allocation ( cost estimates), engineering
  harness designs
• Russian State Specialized Design Institute
  (Rossatom, Moscow)
• N.Agapov, A.Shabunov,V.Borisov

9
Progress in MPD Project Preparation

• Development of the MPDROOT software
• - general framework
• GEANT-4 based simulation
• detector geometry
• track reconstruction

O.Rogachevskys group
10
TPC
Detector geometry in MPDROOT
TOF (RPS based)
11
Event display (geometry selected tracks)
12
Physic tasks first steps
Lambda reconstruction A.
Kechechyan et al. generated reconstructed 1000
decays in AuAu at ?SNN 9 GeV
mass resolution spectra
? 11 MeV/c2
13
Physic tasks first steps
charged hadron production K/? ratio
D. Arkhipkin et al.
yields particle ratios reference points
14
Physic tasks first steps
Electromagnetic observables A.Olchevsky,
I.Tyapkin, etc.
15
First estimation of lepton background
V.M.Golovatyuk, S.P.Lobastov et al.
electron / positron production by URQMD
MPDROOT 1000 interactions of Au Au
origin of vertices (MC) of all produced e? with
p gt 200 MeV/c
15
16
Progress in TPC design
Yu.Zanevskys group
?lt1 0.1GeV/c lt Pt lt 3GeV/c B0.5T Br/Bz
10-4 Ar/CH4 90/10
first stage goal - pad structure optimization
design geometry description simulation of
electron clusters along the track
electron drifts in the TPC gas volume gas
amplification induced charge on the pads pad
signal readout
17
Pad Structure
Progress in TPC design
Yu.Zanevskys group
18
Progress in TPC design
AuAu collision (1100 tracks)
all pad signals in the event
(cm)
?mplitude
(cm)
(cm)
(cm)
(cm)
Signals on pads for different ADC samples
5th sample
905th sample
?mplitude
?mplitude
(cm)
(cm)
(cm)
(cm)
19
Typical track reconstruction efficiency
ECT complementary toTPC to extend pseudorapidity
range
20
MPD End-Cap conception development
21
MPD End-Cap conception development
straw wheels
occupancy /straw lt 15
occupancy per channel could be reduced by
implementing sampled straw
22
End-Cap concept development
Straw Wheels geometry in MPDROOT
ECT - Straw Wheel each consecutive layer is
rotated with respect to the previous one to cover
all gaps and to provide necessary hits (60
layers in total)
23
End-Cap concept development ECT
A.Zinchenko

• to enlarge the acceptance over pseudo rapidity
  region End-Cap elements have been added
• - ECT (Straw Wheels)
• TOF (RPS chambers)

Requires further development probably 1 2
extra planes with high granularity
24
End-Cap concept development
to improve tracking vertex reconstruction
efficiency additional2 CPC for ECT 3 disks
of SSD for ITare proposed
25
RD progress in RPC modules for TOF
V.Golovatyuks group
10-gap RPC module prototype assembling
installation of the fish-line coiling on the
external readout board
fish-line is using as a spacer
installation of the glass electrode with the
conductive paint
assembled prototype with the fast preamp
developed by ALICE on the base of NINO chip
26
RD progress in Shashlyk ECal
A.Olchevsky, I.Tyapkin, etc.
ECal module with 9 avalanche PD
27
RD progress in Shashlyk ECal
Sampling ADC front-end electronics (50 MHz)
constructed by the group of Dr. S.Basylev
28
RD progress in Shashlyk ECal
A.Olchevsky, I.Tyapkin, etc.
Energy resolution data and simulation

• New type of calorimeter using avalanche photo
  detectors,
• has been successfully tested for the first time
• It was shown a wide dynamic range high energy
  resolution
• expected for such calorimeters
• First estimations indicate potential possibility
• to reach 100 ps level in time resolution

29
ECAL (shashlyk) potential possibilities
A.Olchevsky, I.Tyapkin, etc.
Energy resolution 2.5 /vE ? good p
identification Time resolution 80ps /vE ?
TOF for charged particle id ? suppression of
pile-up electronic noise
30
RD progress in Segmented Straw
to provide achieve low occupancy safe
operation in harsh environments
V.Peshekhonovs group

• a prototype is developed for the beam testing
  with
• double Layer Detector
• (anode high-voltage)
• FEE (low-noise amplifiers)
• DAQ (interface PCI-Express
• 64-channels TDC)

Double Layer Detector contains 2x48 straws (?
4 mm L 40cm) 400 segments (L
10cm/segment) FEE density FEE is 1 ch. / 1mm
31
End Cap Wheel prototyping
V.Peshekhonovs group
Segmented prototype for EC 35o sector 6 layers
(R, 7o, -7o, R, 7o, -7o) Rin 300 mm, Ro1300
mm 192 straws ? 4 mm, L 1000mm
fragment of 4 layer wheel tracker
The first prototype should be ready for tests in
2009
32
RD progress in IT
Yu.Murin, V.Nikitin, et al.
Consortium GSI, JINR, INP MSU, SESRTIIE
(Kharkov), IHEP, Saint-Petersburg Uni.,
Saint-Petersburg Radium Inst., ITEP
Double side silicon micro strip sensor
(15x15mm2, 50um strips, 285 um thickness, 256
channels) mounted on a base plate with super low
mass cables for PS readout
33
Zero Degree Calorimeter
A.Kurepin et al. INR
34
Development of IT Infrastructure
Group of Yu.Potrebenikov
34
35
Plans for 2009

• Completion of general MPD conceptual design
• preparation the corresponding document MPD CDR
• Continuation of RD for all subsystems
• in cooperation with (potential) collaborators
• Design and construction of prototypes for
• TPC module
• RPC based TOF supermodule
• Straw wheel segment
• ..
• Test beam facility preparation

36
Conclusions

• MPD LoI with first approach to the conceptual
  design
• is available since the beginning of 2008
• The next stage is - preparation of MPD
  CDR
• taking into account End Cap tracking
• particle ID performances
• RDs are well advanced in various subsystems
• A formation of appropriate groups is going on and
  
• the reparation of MPD project in general is
  progressing

37
Conclusions

• Further development of the MPD project
• requires acceleration of the appropriate
  Collaboration
• formation
• General Agreements on Cooperation are signed
  between the JINR and GSI, Helmholtz acc., INFN
• cooperative works in this field of research
• are carried out together with many Russian
• world centers
• the collaboration is growing

38
Thank you
39
spare
40
Conclusions

• Further development of the MPD project
• requires the enlargement of MPD Collaboration
• New SPD project preparation has started
• General Agreements on Cooperation are signed
  between the JINR and GSI, Helmholtz acc., INFN
• cooperative works in this field of research
• are carried out together with many Russian
• world centers
• the collaboration is growing

41
Evolution diagram
Hadronisation, hadronic phase chemical
freeze-out
QGP formation hydrodynamic expansion
Hadronic phase kinetic freeze-out
Start of the collision
pre-equilibrium
Chemical freeze-out finish of inelastic
interactions Kinetic freeze-out finish of
elastic interactions. ____________________________
_______ ) freeze-out here means to get
rid
42
1. Search for mixed phase of strongly interacting
matter
What to look for ?
Elliptic flow of central fireball matter
One has to measure the ellipticity parameter
?(Etotal) ?ps?/?py?
42
43
Introduction

• New strategic course of the JINR in relativistic
  heavy ions is proclaimed
• to study of various phases of strongly
  interacting matter
• It is based on
• development of the home accelerator facility
• from Nuclotron to NICA

Relativistic Heavy Ion Physics is a high priority
task in many scientific centers (BNL, CERN, GSI,
JINR,..) since last few decades
Theoretical motivation of relativistic heavy ion
study at JINR is well founded in the works
of A.Sissakian, A.Sorin, V.Toneev, G.Zinoviev et
al.
44
TPC geometry (MPDROOT)
45
TOF (RPC based) geometry (MPDROOT)
46
ZDC geometry (MPDROOT)
47
Event display (geometry) under MPDROOT
48
End-Cap concept development ECT

• Comparison of two versions of End-Cap tracking
• TPC alone
• TPC ECT (Straw Wheels) ETOF
• at various limits on momentum resolution

49
ECT straw wheel
Stereo wheel construction each stereo wheel
contains 4 layers of radial straws with different
orientation
50
MPD conceptual design
Towards 4p acceptance to cover a wide
pseudorapidity range
51
DAQ Computing

• events 2 10 10
• disk space 10 000 TB
• PCs 1800

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Physics Objectives
FAZA at Nuclotron
S.Avdeev, V.Karnaukhov effects of phase
transition in thermal multifragmentation
HADES CBM A.Malakhov,
Yu.Zanevsky, Yu.Murin at SIS 18, 100/300 GSI
NA49 -gt NA61 at SPS CERN
G.Melkumov STAR at RHIC BNL
R.Lednicky, Yu.Panebratcev ALICE at LHC CERN
A.Vodopianov
53
?????? ??????????? ?? ????? ?????????? PS (?????
T9)
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