Speaker
Description
Recent upgrades of synchrotron light sources aim to achieve ultralow emittances, requiring strong magnet strengths that inevitably lead to severe nonlinear effects. Consequently, securing a sufficient Touschek lifetime has become a critical challenge for storage rings, including the Korea-4GSR. In this study, we performed systematic scans of tune and chromaticity to identify optimal working points and characterize lattice properties in the presence of nonlinearities and errors. Through these scans, we observed a distinct dependency of the Touschek lifetime on chromaticity settings. We explain the reason for the optimal chromaticity range by analyzing Momentum-Dependent Tune Shift (MDTS) curves and higher-order chromaticity effects.
Nonetheless, directly optimizing the lifetime is computationally intensive because it requires calculating the momentum aperture along the entire ring. Hence, to overcome this challenge, we propose an efficient indirect optimization method based on the analysis of W-function fluctuations.
| Paper status | Resubmitted proceeding files received and assigned to an editor. Accepted. |
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