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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 introduce a local vertical dispersion scheme in the SAPS storage ring lattice. This is achieved by applying a bending angle to a longitudinal gradient dipole within a DBA-like cell, generating the desired vertical dispersion, which is subsequently corrected by a dipole in the subsequent cell. This paper details the generation of this local vertical dispersion and evaluates its impact on the overall ring performance.
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