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PETRA III is a low emittance storage ring dedicated to synchrotron radiation. Twenty damping wigglers with a total length of 80 m are used to reduce horizontal emittance to 1 nm rad. For efficient injection in so called top-up mode, the dynamic aperture should be larger than 30 mm·mrad in horizontal plane. This paper presents the beam dynamics study for the damping wigglers, the choice of suitable tunes of machine, and the optimization of sextupoles configuration. The simulation results including magnetic errors and misalignment will be given.
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