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Recently proposed novel idea of "crabbed waist" beam-beam collisions will betested at DAFNE during the collider run for the Siddharta experiment. In orderto achieve the goal luminosity, large dynamic aperture is a matter of primaryimportance. A new method of a dynamic aperture optimization based onstep-by-step chromaticity compensation with choosing the "best" sextupole pairat each step was applied to the DAFNE upgrade lattice. Several tune points wereconsidered taking into account both high luminosity and large dynamic aperture.Algorithm and results of optimization will be presented.

Dynamic Aperture Optimization for the DAFNE Upgrade