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Three storage ring lattices have been designed as options for a futureupgrade of the Stanford synchrotron radiation lightsource (SSRL). The threeoptions differ in circumference and targeted future site, with one to be builtin the tunnel of the present SPEAR3 ring, one as a green field ring on the SLACcampus, and the third in the tunnel of the decommissioned PEP-II ring. Thelattices are based on the newly proposed hybrid 6-bend achromat (H6BA) latticecells, which is ideal for pushing the photon beam brightness while achievingexcellent nonlinear dynamics performance. The transparent matching conditionsare enforced to minimize the negative impact of the loss of periodicity due toinsertion of various long straight sections. Numerical optimization isperformed to further improve the nonlinear dynamics. In addition to reachingvery low emittances, the lattices can accommodate traditional off-axisinjection and achieve beam lifetimes similar to or exceeding that of typicalthird generation rings.

Advanced storage ring lattice options based on hybrid six-bend achromat for Stanford Synchrotron Radiation Lightsource upgrade