System for the magnetic spark spectrometer (MIS JINR) data processing

Software for the event geometrical reconstruction and their kinematic analysis being a part of an on-line system for the magnetic spark spectrometer data processing is described. When reconstructing the space picture the distortions of spark chamber glasses are taken into account, as well as track fractures during paritcle rescattering in chambers. Simultaneously kinematic fit and vertex determination which essentially decreases the track angular errors at their extrapolating into vertex is made. Efficiency of automatic processing for three-track events amounts to 92% that for five-track events is 62%. The accuracy over transverse momentum is 17 MeV/c, over the mass of three-pion events - 26-34 MeV/c2. A high accuracy of event reconstruction permits to obtain principally new results when studying the pion diffraction on nuclei