Transcript Document

CBM and FRRC
Mikhail Ryzhinskiy, SPbSPU
(on behalf of Russian CBM branch)
1st FRRC International Seminar
Compressed Baryonic Matter experiment
SIS 300 → U92+ 15-35 GeV/nucleon with beam intensities up to 109/s
Z/A = 0.5 nuclei up to 45 GeV/nucleon
→ exploration of the
QCD phase diagram with
heavy-ion collisions!
→ investigation of nuclear
matter at highest baryon
densities but still
moderate temperatures in
A+A collisions
2
Fundamental Questions of QCD
 What is the equation-of-state of strongly interacting matter?
(core collapse supernovae, neutron stars, early universe)
 What is the structure of strongly interacting matter
as a function of T and ρB ? (hot and dense hadronic medium,
deconfined phase, phase transitions ?)
 What are the in-medium properties of hadrons as a function
of T and ρB ? (partial restoration of chiral symmetry ?)
compression
+
heating
=
QGP ?
3
The Compressed Baryonic Matter Experiment
Muon
Ring
Imaging
detection
Cherenkov
System
Detector
PNPI
IHEP,
PNPI
ECAL
ITEP,
IHEP
Transition
Tracking
Radiation
Detector
Detectors
JINR, PNPI
Silicon
Tracking
Station
MSU,
MEPHI,
JINR,
IHEP,
Khlopov,
CKBM
Resistive
Plate
Chambers
(TOF)
INR, IHEP
Dipol
magnet
JINR
4
List of candidates for FRRC grants from the Russian
Institutes
•
•
•
•
•
•
•
•
•
•
•
•
•
Sergei Belogurov (ITEP) PhD – Design and Integration of the CBM experiment
Mikhail Ryzhinskiy (SPbSPU) PhD – Advanced Digitization and Cluster Finding in
MUCH
Alexander Sadovsky (INR) PhD – Event-by-event Fluctuations at CBM Experiment
Andrei Chernogorov (ITEP) – Design Justification of ECAL
Olga Denisova (JINR) – Development of New Mathematical Methods for
Experimental
Data analysis
Alexander Dermenev (INR) – Study of Projectile Spectator Detector for Centrality
and
Reaction Plane Determination
Dmitry Golubkov (ITEP) Optimization of CBM ECAL for χc States
Production Studies
Alexander Klyuev (MEPhI) - Development or Data-driven, De-randomizing
Architecture and
Building Blocks for the CBM-XYTER
ASIC
Eugeny Kryshen (PNPI)
– MUCH Design and Construction, Software Development
Mikhail Prokudin (ITEP) - Development of CBM ECAL Software
Georgy Sharkov (ITEP)
- Comparison of ω and φ Meson Cross Sections, Measured
in
Different Decay Modes using CMMROOT
Simulations
Taras Vasiliev (JINR)
- Participation in the R&D of TRD and Development of
Software
for Selection of Strange Particles in NucleusNucleus Collisions
Vladislav Zryuev (JINR) - Research and Development of Fast and High Resolution
Gaseous
Detectors for CBM
5
Polarization in HI collisions as a new probe of the
phase-transition (T.Vasiliev, Dubna group)
A number of polarization observables have been proposed as a possible
signature of phase transition in heavy ion collisions:
• Decreasing of the Λ0 transverse polarization in central collisions
• Global hyperon polarization in non-central events
The study of the polarization effects at CBM requires good
definition of the reaction plane RP and collision centrality b.
Kinematical fit using ASME method for STS(Au+Au centr.
coll. 25 AGeV, via UrQMD, GEANT3 m.field) improves
accuracy of the primary vertex determination
spatial
approx. 20 microns
(P_V0, beta, tan(alpha)) : better than (1%,0.5 mrad, 0.3)
6
Research and development of fast gaseous detectors
for TRD CBM (V.Zryuev, LHEP JINR, Dubna)
Main requirements for TRD detectors
• High granularity
• High radiation hardness
• Spatial resolution < 300µm
• Minimum material budget
• High rate capability
• Optimal number of electronic channels
• high-speed detector (for the inner part of the detector planes)
The results obtained with GEM based detector
•
Spatial resolution is ~ 90 µm for 600µm strip pitch
• Good linearity ~ 1%
• Amplification factor ~ 2 x10³.
The results obtained with THGEM based detector
•
•
•
Spatial resolution is ~ 230 μm fot 1 stage THGEM detector
We are working on the technology for construction of THGEM
patterns (holes and rims) with a high precision.
FEE with n-Xyter chip is planning to use for further tests.
R&D work show that both GEM and THGEM detectors require
a lot of work to improve its reliability and stability to use them in a large system like
CBM.
7
The results obtained with MWPC based detector
Layout of the detector installation
on the beam line SYS-18 GSI
We have performed a systematic
study
of several types of gas MWPC
detectors
at high intensity beams at GSI .
The R&D of the MWPC detectors shows practically no degradation of the
signal amplitudes up to the rate of 360 kHz/cm2. Taking into account the
high spatial resolution (< 200 μm) and the operational stability of the MWPC
detector as well as the results obtained on its high rate capability in our
research we believe that this type of detector meets all requirements to TRD
of the CBM project.
8
 and ω resonance decay modes (G.Sharkov, ITEP)
If resonance decays before in dense barionic
matter 
Possible rescattering of hadronic daughters 
Reconstruction probability decrease for hadronic
mode
ω(782)  π+π-π0,  π+π-,  π0
(c = 23 fm)
φ(1020) 
(c = 44 fm)
K+K-,
 η, 
e+e-
e+
φ
eφ
η

K
e+e-
φ
η
+
K
+
-
K
φ
hadronization
β= 1/3
ω
l,fm
Kinetic freeze-out
Calorimeter simulation and  reconstruction
(M.Prokudin, ITEP)
Shower library
•Fits exactly to
the data
•Any incident
angle
•checking
analytical
approximation
quality
LHCb inner. 4mm
Near fibers
1cm
Gray – MC. Black – data. Scale!
1cm
Prototype. 0.5 mm
Near fibers
1cm
10
Advanced digitization and hit finding in MUCH
(M.Ryzhinskiy, SPbSPU)
11
On e/p identification: comparision of TRD prototype
measurements with GEANT simulation at p=1.5 GeV/c
(O.Denisova, JINR)
•One cannot get a maximal value of pion’s suppression when using the LFR test,
because the electron energy losses are described by a complex hypothesis – the
sum of two distributions.
•Using GEANT simulations were reproduced the results obtained on the basis of
real measurements, and there was demonstrated that the procedure of preparation
of data sets based on real measurements is a reason of getting erroneous,
12
overestimated results
Time schedule
Time schedule