Design of a Compact 16 T Common-Coil Dipole for Future Colliders

Abstract

High magnetic field dipole magnets are the enabling technology for future colliders surpassing the energy reach of LHC. The effectiveness of the common-coil layout, featuring flat racetrack coils shared between the two magnetic apertures, is investigated here. Potential advantages include the use of flat cables and larger bending radius at the coil ends. However, the vertical arrangement of the two apertures is less efficient than the traditional case with the two apertures placed side by side, from both the magnetic and mechanical standpoint. In this study, we attempt to address these challenges and provide an attractive and compact common-coil design in the field and aperture range of interest. The design choices aim at achieving a limited number of turns and layers, good quench protection performance, and low operating voltage. Key performance parameters such as maximum field as a function of superconductor volume and overall magnet size, field quality, Lorentz forces acting on the coils, and quench protection in the accelerator will be discussed.