2026-10-14T12:46:41Z https://www.scidb.cn/oai

10.57760/sciencedb.j00186.00147 2024-05-22T12:39:55Z

2024-05-22 Highly coupled off-resonance lattice design in diffraction-limited light sources doi:10.57760/sciencedb.j00186.00147 en The round-beam operation presents many benefits for scientific experiments regarding synchrotron radiation and the weakening influences of intra-beam scattering in diffraction-limited synchrotron light sources. A round beam generation method basedon theglobal settingof skewquadrupoles andthe applicationof a non-dominated sorting genetic algorithm was proposed in this study. Two schemes, including large-emittance coupling introduced via betatron coupling and vertical dispersion, were explored in a candidate lattice for an upgrade-proposal of the Shanghai Synchrotron Radiation Facility. Emittance variations with lattice imperfections and their influence on the beam dynamics of beam optic distortions were investigated. The results demonstrated that a precise coupling control ranging from 10% to 100% was achieved under low optical distortion, whereas full-coupling generation and its robustness were achieved by our proposed method by adjusting the skew quadrupole components located in the dispersion-free sections. The Touschek lifetime increased by a factor of 2 to 2.5. Diffraction-Limited Storage Ring (DLSR); Shanghai Synchrotron Radiation Facility Upgrade (SSRF-U); Round beam; Off-resonance coupling Yi-Hao Gong Shun-Qiang Tian PUBLIC https://creativecommons.org/publicdomain/zero/1.0/ dataset http://www.doi.org/10.1007/s41365-024-01511-4 Science Data Bank