Study of Upgrade Scenarios for the SOLEIL Storage Ring

The SOLEIL storage ring, commissioned in 2006, is a 2.75GeV third generation synchrotron light source with a horizontal emittance of 3.9nm·rad for a circumference of 354m. Within the scope of a future major upgrade towards a Diffraction Limited Storage Ring (DLSR), the present paper presents and discusses lattice design and magnet lattice arrangement, under the constraint of making the upgradein the same existing machine tunnel. Two scenarios were presented earlier in this context, which both preserved all the existing24straightsectionshostinginsertiondevices, injection and RF-cavities, though the bending magnet positions were not strictly conserved. The purpose of the extended studies is to explore, in particular, the range of horizontal emittance that can be reached.The dependence of the nonlinear propertiesof the magnet lattice on the linear optics is simultaneously investigated.