Speakers
Description
At GSI Darmstadt, the ESR storage ring is a fundamental device for atomic physics experiments. The operation of this storage ring requires precise control of the machine optics. However, the ESR has suffered from imprecise optics control, which yielded a mismatch of about $\sim0.1$ in the tune predicted by the MAD-X model.
In this work, we present a beam-based method to reduce these tune deviations by improving the linear optics model of the ESR. Using Differential Evolution (DE), a population-based derivative-free optimizer, we determine correction factors for the quadrupole families by minimizing the discrepancy between simulated and measured betatron tunes. The optimized lattice reduces the tune discrepancy of $\Delta Q$ to the level of $0.01$. The agreement in the beta functions and dispersion is preserved or slightly improved.
The resulting optics model provides a significantly more accurate representation of the ESR and offers a reliable basis for improved machine operation, future beam-based studies, and further nonlinear or global optics optimization.
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