**A MAPS based Inner Tracking System of the Multi-Purpose Detector at the NICA collider**
Yu.A.Murin, A.D.Sheremetev, A.I.Zinchenko (JINR,Dubna,Russia),
S.N.Igolkin,V.P.Kondratev (SPbSU,St.Petersburg,Russia),
Yaping Wang (CCNU, Wuhan, China)
(For the MPD Collaboration)
The Multi-Purpose Detector (MPD) is being constructed to study the properties
of extremely dense nuclear matter formed in relativistic nucleus-nucleus collisions
at NICA energies. The yields of strange and charmed particles are the important
observables sensitive to critical phenomena in phase transitions of the QGP-
matter at high net-baryon density. Highly efficient registration of such short-lived
products of nuclear interactions using vertex silicon detectors will play a key role
in the analysis of the possible onset of deconfinement in nuclear matter.
An Inner Tracking System (ITS) based on the Monolithic Active Pixel Sensors
(MAPS) is under design by the emerging MPD ITS collaboration in Dubna and Wuhan.
The ultra-light carbon fiber structure carries five layers of CMOS ALPIDE sensors
recently elaborated by the ALICE collaboration. The two layers of the Outer
Barrel (OB) are built out of 42 staves developed for the new ALICE ITS to be installed
at CERN next year. The MPD ITS mainframe mechanics and the OB installation is
planned to be completed in 2023. The Inner Barrel (IB) will use novel MAPS sensors
of enlarged area and reduced thickness to be developed together with the ALICE
collaboration within 2020-2025 and installed after the reduction of the diameter
of the MPD beam pipe to optimal value of 38 mm will become possible.
The poster presents the main details of the MPD ITS layout, computer simulations
of the pointing resolution gained with the system, as well as a quality assessment
of the MPD tracking system including ITS and Time Projection Chamber used for
the reconstruction of the multi-strange hyperons and the D-mesons produced in the
central Au-Au collisions at \sqrt(s_NN) = 9 GeV.