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A lattice for the future project of VUV and soft X-ray high brilliant light source

We present a lattice for a third generation VUV and soft X-ray light source, which is a future project of the Institute for Solid State Physics (ISSP) of the University of Tokyo and is being designed in close collaboration with the Photon Factory of KEK. The storage ring has an energy of 2 GeV, a circumference of about 400 m, an emittance of less than 5 nm rad, four 13 m long straight sections and twelve 7 m semi-long straight sections. We first present the lattice design of the ring, the chromaticity correction and the dynamic aperture, and then present a new lattice which is now under study to improve the performance.