Activity on the sextupole round coil superferric magnet prototype at LASA

The LASA Laboratory (INFN, Milan, Italy) is developing an unconventional type of superferric magnets suitable to arbitrary multipole order, which we refer to as round coil superferric magnets. This type of magnet is suitable for strain-sensitive superconductors because it uses round coils with large bending radius to create the magnetic field, while the round yoke with arbitrary multipoles is able to create the desired harmonic component for the magnet. The electromagnetic design of such magnet in sextupole configuration has been already presented. In this paper, we present the progresses in the construction of the prototype, the results of the test of the first coil produced at LASA with the MgB2 conductor, and the detailed design of the mechanical structure. This activity is part of a collaboration between INFN and CERN in the high luminosity LHC program.