Effect of stray field, exhaust target and multiple scattering on a gas on parameters of the beam extracted out of the JINR phasotron

The results of calculations of proton beam emittances for (664±3.2) MeV energies is described. Magnet stray field dispersion of the phasotron, Coulomb scattering at exhaust Al targetr and at ionization chamber having 500 mkm full thickness (aluminium) and drift-space 4.5 m long are taken into consideration. It is shown that the effective horizontal and vertical emittances of extracted beam will decrease 1.6 and 1.5 times in the focus point in the beam was transported in vacuum ion chamber from the accelerator to the target