Mechanical and Magnetic Design of the Superferric Dipoles for the Super-FRS of the FAIR Project

The Superconducting FRagment Separator (SuperFRS) is a part of the Facility for Antiproton and Ion Research, a new international accelerator facility for the research with antiprotons and ions to be built in Darmstadt, Germany. The Super-FRS is a two-stage fragment separator consisting of a PreSeparator and a Main-Separator, which includes 24 superferric H-type dipole magnets with trapezoidal structure and large aperture. The dipole magnets of the separator will have a deflection radius of 12.5 m, a magnetic field of up to 1.6 T, and an effective length of more than 2 m to bend ion beams with a rigidity from 2 T · m up to 20 T · m. Two trapezoidal-shaped Nb-Ti coils will be located inside a cryostat cooled with liquid helium, but the dipole will have a warm iron yoke with a wide air trim slot. This air trim slot and four chamfered removable poles are designed to meet the required field homogeneity. This paper reports on the current status of the mechanical and magnetic design of such a dipole. The structural stability of the coil case based on 3-D finite-element analysis and the magnetic field simulations of the magnet are presented in detail.