Linear and Nonlinear Optimizations for the ESRF Upgrade Lattice

The ESRF storage ring will be replaced in 2020 by a new hybrid multi bend achromat lattice with 134 pm · rad equilibrium horizontal emittance. To determine the best working point, large scans of tunes and chromaticities have been performed, computing Touschek lifetime and dynamic aperture. From different working points, the multi-objective genetic algorithm NSGA-II has been used to optimize the nonlinear magnets values and some linear optics parameters. The analysis have been carried out on lattices with errors and corrections. The optimizations have produced lattices with longer lifetime and larger dynamic aperture for different working points with positive chromaticities.

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