Configuration of the proposed DIAMOND superconducting dipole magnet

Whist the majority of the dipole magnets in the proposed UK synchrotron source DIAMOND will be of conventional design, the option of including a small number of superconducting magnets, to provide hard radiation, is currently under consideration. The required field strength of 4.35 T is modest, but the large horizontal aperture and the short magnetic length place unusual demands on the design. To meet these, a number of possible configurations have been examined. These include a straight cylindrical arrangement, with cosine theta coil distribution and cold iron, and a rectangular coil configuration, with warm iron. The reported work is not a full design exercise, but rather a preliminary investigation to identify the most suitable configuration and for use in a more detailed study in the future.