Lattice studies for a high-brightness light source

A number of lattices have been studied for use in a high-brightness Canadian synchrotron light source. In particular we have investigated some designs similar to the proposed 1.5-2.1 GeV Swiss Light Source, which incorporates superconducting dipoles in multi-bend achromats, but providing 8 or 10 rather than the original 6 straight sections. Similar emittances to those of the original (1.6 nm-rad at 1.5 GeV) can be obtained, but to achieve similar dynamic apertures great care has to be taken in placing the chromaticity- and resonance-correcting sextupoles, because of their unusual strength. A scheme is described which allows the dynamic apertures to be more than doubled to ~100 mm-mrad in both planes