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A promising direction for fourth-generation light sources is the integration of a free-electron laser (FEL) oscillator to achieve higher spectral brightness. This approach imposes stringent requirements not only on the FEL oscillator parameters but also on the storage ring's performance. Preliminary studies at the Southern Advanced Photon Source (SAPS) indicate that the optimal gain for an oscillator occurs when the vertical dispersion in a long straight section is approximately 1 cm. To realize this condition, we explore methods to introduce a local vertical dispersion in the SAPS storage ring lattice. Several approaches are under consideration, such as applying a bending angle to a longitudinal gradient dipole within a DBA-like cell to generate the desired vertical dispersion, with subsequent correction using a dipole in the next cell. This paper discusses the principles for generating such local vertical dispersion and evaluates its potential impact on the overall ring performance.
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