Design and development of Nb/sub 3/Sn single-layer common coil dipole magnet for VLHC

Common coil dipole magnets based on Nb/sub 3/Sn conductor and the react-and-wind technology are a promising option for the next generation of hadron colliders. The react-and-wind technology has potential cost benefits related to less expensive cable insulation, structural materials and magnet fabrication. A common coil design allows the use of a pre-reacted Nb/sub 3/Sn superconductor with low critical current degradation after bending. Fermilab in collaboration with LBNL is involved in the development of a single-layer common-coil dipole magnet with a maximum field of 11 T and 40-50 mm aperture for a future VLHC. This paper reports the current magnetic and mechanical designs of the dipole model, the magnet parameters and the status of the program.