On the possibility of performing twice polarized pion photoproduction experiments of the type G and H at Yerevan synchrotron

At Erevan synchrotron the performance of twice polarized-meson photoproduction experiments in the energy range of perturbation of nuclear resonances N is designed. In these experiments a beam of linearly polarized photons will be used polarized proton target (PPT) that can alter the direction of the proton polarization vector along three mutually perpendicular axes. The measurement technique of polarization parameters are described, peculiarities of the investigations by means of PPT, connected with the presence of magnetic field near the magnet, are considered. The influence of the PPT field on particle trajectories in the experiment with a magnetic spectrometer is investigated based on the Monte Carlo calculations. In the paper the setup parameter corrections for the spectrometer are defined