Modification and optimization of the storage ring lattice of the High Energy Photon Source

Purpose For the High Energy Photon Source (HEPS), a green-field fourth-generation storage ring light source, the preliminary design report (PDR) was completed in 2018, when the accelerator physics design had been basically finished. During the subsequent hardware and engineering design of the HEPS storage ring based on the PDR design, a few problems and challenges emerged, calling for modifications of the lattice. Method In this paper, we will introduce the background and reasons for the modifications and present the linear optics and simulation results for the nonlinear performance of the modified lattice of the HEPS storage ring. Result and conclusion The modified lattice satisfies the requirements from hardware and engineering design.