Theoretical minimum emittance lattice for an electron storage ring

A theoretical minimum emittance lattice for an electron storage ring is derived, where the dispersion function at the entrance to the dipole is varied to minimize the function in the dipole. The achievable minimum emittance is about 1/3 that of the equivalent Chasman-Green lattice. The interesting aspect is that the optimal minimum beta * value in the minimum emittance lattice is 4/3 times larger than that of the corresponding Chasman-Green lattice. Therefore, it may be easier to achieve the minimum emittance with this lattice. However, the theoretical minimum emittance lattice does not have a zero dispersion straight section.<>