A SEVEN-BEND-ACHROMAT LATTICE AS A POTENTIAL UPGRADE FOR THE ADVANCED PHOTON SOURCE

The Advanced Photon Source (APS) is a 7-GeV storage ring light source that has been in operation since 1996. In that time, the emittance has dropped from 8 nm to 3 nm. The increasing feasibility of multi-bend-achromat lattices (e.g., the MAX-IV project) promises the possibility of a much greater reduction in emittance. In this paper, we show the design of a symmetric seven-bend-achromat lattice, including linear optics, nonlinear dynamics optimization, magnet requirements, and performance with errors.