Characterizing and studying the nonlinear beam dynamics performance of Iranian Light Source Facility storage ring

In this paper, we will investigate the nonlinear beam dynamics issues (performance and optimization) of Iranian Light Source Facility storage ring. The strong sextupole fields together with the imperfections in a low emittance machine will result in the large detuning effects and driving the different order of the resonance lines. We have used most recently achievement for the nonlinear optimization of the storage ring. We have optimized the nonlinearity of the lattice by analyzing the resonance driving terms, direct dynamic aperture tracking and frequency map analysis calculations. We have evaluated the performance of the lattice against different imperfections such as magnet misalignments, multipole harmonics, fringe field of the quadrupoles and insertion devices. Furthermore, the effect of the lattice imperfections on the off-momentum particles dynamics has been studied through momentum acceptance and lifetime calculations.