  The stress-management cos-theta (SMCT) coil is a new concept which has been
proposed and is being developed at Fermilab in the framework of US Magnet
Development Program (US-MDP) for high-field and/or large-aperture accelerator
magnets based on low-temperature and high-temperature superconductors. The SMCT
structure is used to reduce large coil deformations under the Lorentz forces
and, thus, the excessively large strains and stresses in the coil. A
large-aperture Nb3Sn SMCT dipole coil has been developed and fabricated at
Fermilab to demonstrate and test the SMCT concept including coil design,
fabrication technology and performance. The first SMCT coil has been assembled
with 60-mm aperture Nb3Sn coil inside a dipole mirror configuration and will be
tested separately and in series with the insert coil. This paper summarizes the
large-aperture SMCT coil design and parameters and reports the coil fabrication
steps and its assembly in dipole mirror configuration.
