Speaker
Description
This paper presents a new method for nonlinear optics correction of storage ring lattices, which is based on locally generated orbit bumps and the corresponding response matrices. This method is conceptually similar to nonlinear optics from off-energy closed orbits (NOECO), but can be applied to the situation with harmonic sextupoles. Instead of off-energy closed orbits, it exploits the feed-down effects of sextupoles with generated local bumps to directly probe the sextupole components of a lattice. A second-order bump response matrix is constructed from the difference between orbit response matrices measured with positive and negative local bumps. A least-squares fitting procedure is then applied to minimize the difference between measured and model second-order bump response matrices, from which sextupole strength correction can be obtained. Preliminary simulations on the Hefei Advanced Light Source lattice demonstrate the theoretical viability of the method, though high sensitivity to realistic residual errors poses practical challenges that require further investigation.
| Paper status | Resubmitted proceeding files received and assigned to an editor. Accepted by Submitter. |
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