Magnetic-field calculations of the superconducting dipole magnets for the high-energy storage ring at fair

For the high-energy storage ring (HESR) to be established at the FAIR facility at GSI in Darmstadt, Germany, magnetic field calculations have been carried out for the layout of the superconducting dipole magnets. Four configurations have been considered for the 3 m long magnets: straight ones and bent ones with a bending radius of 15.279 m, respectively, both for the cos(thetas)-layout and for the double-helix dipole (DHD) layout. This contribution will focus on the advantages and disadvantages of the individual configurations in terms of field quality in the dipole regions.