Speaker
Description
The pursuit of diffraction-limited storage rings has driven emittance targets into the picometer regime. This paper presents a novel Single Hybrid Multi-Bend Achromat (SH-MBA) lattice design for the Southern Advanced Photon Source (SAPS), targeting an emittance at the 1 pm level. The compact SH‑16BA design, operating at 3.5 GeV with 36 periods and a 945 m circumference, employs high‑gradient quadrupoles, reverse bends, and longitudinal gradient bends. While collective effects such as Intra‑Beam Scattering allow the equilibrium emittance to reach the diffraction limit for hard X‑rays, the most critical challenge lies in nonlinear dynamics optimization. The required sextupole strengths are extremely high, generating nonlinear driving terms three orders of magnitude larger than in typical 4th‑generation sources and restricting the dynamic aperture to about 1 mm. This work demonstrates that achieving a reliable 1 pm-level design will require novel methods to suppress these severe nonlinearities.
| Paper status | Resubmitted proceeding files received and assigned to an editor. Accepted by Submitter. |
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