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We developed a low emittance electron storage ring with large 6D dynamicaperture. Contrary to the traditional approach using strong focusing magneticcells with optimized (and large) horizontal phase advance, which yields hugenatural chromaticity, we employed a relatively weak focusing lattice with lowchromaticity per cell and, consequently, wide on- and off-momentum dynamicaperture. Inevitable for weak focusing emittance growth, we compensated byslicing the lattice into many short, with small bending angle, elementaryperiodic cells. To reduce the size, we superimposed focusing gradient andchromaticity compensating sextupole components over the dipole field utilizingsuperconducting magnets based on the Canted Cosine Theta (CCT) windingtechnology. The result is a model lattice with 50 pm horizontal emittance at 3GeV beam energy, with 400-500 m circumference and large 6D aperture.

Weak focusing low emittance storage ring with large 6d dynamic aperture based on canted cosine theta magnet technology