Accumulation of spatial charge in the time-projection chamber of the multipurpose detector

The article presents results of numerical simulation of spatial positive charge accumulation in the TPC of Multipurpose Detector at NICA, JINR. Based on the spatial distribution of the charges problem of calculating the electrostatic potential of field created by these charges is solved. The radial, angular and axial distortions of electrons movement from the point of ionization to readout planes are calculated