SPS-II machine imperfections and optimization

SPS-II was designed for low emittance storage ring with compact Double-Triple Bend Achromat (DTBA) cell. To ensure sufficient machine performance, realistic machine imperfections were simulated and incorporated into the optimization process.Thus the lattice solutions were made robust against imperfections, thereby reducing the machine’s sensitivity. The solution with sufficient dynamic aperture and lifetime can be found in the presence of imperfections. The simulation steps and optimization will be discussed in this work.