Design of a 6 TeV muon collider

A preliminary lattice design of a muon collider ring with the center-of-mass (CM) energy of 6 TeV is presented. The ring circumference is 6.3 km, and the beta function at collision point is β^* = 1 cm in each plane. The ring linear optics, a local non-linear chromaticity compensation in the Interaction Region (IR), additional IR non-linear correction knobs, and the effects of non-linear fringe field are discussed. Magnet specifications are based on the maximum pole-tip field of 20 T in dipoles and 15 T in quadrupoles. Careful compensation of the non-linear chromatic and amplitude dependent effects provides a sufficiently large dynamic aperture for the momentum range of up to ± 0.5% without considering magnet errors.