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The successful non-linear performance of 4th-generation light sources can be supported through a proper design of the linear lattice. However, important quantities like the injection efficiency and the beam lifetime depend on the optimization of non-linear magnetic fields like sextupoles, octupoles (and sometimes decapoles) in the lattice and therefore on numerical optimization. The underlying quantities to be maximized, are the limits of stable particle motion in the injection plane, the dynamic aperture, and the Touschek lifetime, i.e. the momentum acceptance of the ring. Commonly, multi-objective genetic algorithms are used for the optimization. Alternatively, the resonant driving terms can be minimized. Both approaches need to take the uncertainties introduced by manufacturing tolerances or jitters in the real machine, into account. Using the parameters of the BESSY III storage ring at HZB, Berlin, this paper compares both approaches and tries to develop an efficient optimization strategy for the upcoming technical design phase.
| In which format do you inted to submit your paper? | Word |
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