DIAMOND: a UK national light source project

Modifications to the original racetrack lattice concept as used in the feasibility study of the DIAMOND light source project are presented. Double bend achromat structures with both 16 and 20 cells are described, with 4 fold superperiodicity. The production of higher brightness beams through lower emittance is achieved by optics solutions having finite dispersion in the long straights. The implications of insertion device minimum gaps and of the beam energy spread are discussed with reference to the specification of the radiation spectrum required by users.