Abstract
In this note, we describe a design of lattice, which is by no means optimized for the ultimate performance, but these parameters can be used for the starting point of other design efforts. Assumptions and features used in this design are: (1) 32 periods which is reasonably high periodicity for chromaticity corrections. (2) Achromatic bending cell which enables us to make all straight sections to be dispersion free. (3) Twiss parameters at dispersion area are the same for all cells to make undulator straight section can be tuned to wiggler straight section a-id vice versa. (4) No attempt is made to extract the photon beam from bending magnets, and when this feature is added, the lattice design may have to be changed in order to provide-the photon beam channel. (5) Natural emittance in the horizontal plane is made as small as possible in the range of 10-8m radians. This value can be optimized later by judicious choice of the Twiss parameters through the bending magnets. (6) The bending magnet should have parallel edges in order to simplify its construction. This assumption implies that there is vertical focussing from the edge. (7) The beta functions at the straight section should be tunable so that various configurations of the insertion devices should be accommodated.
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