Fabrication and Assembly of the Nb₃Sn Dipole Magnet FRESCA2

The FRESCA2 Dipole Magnet is developed within the framework of a collaboration between CEA Saclay and CERN, in the continuity of the European project EuCARD. The goal is to manufacture a dipole magnet providing a 13 T magnetic field in a 100 mm aperture for a superconducting cable test station at CERN. The magnet is composed of four double-layer Nb₃Sn coils, arranged in a block-type configuration, with flared ends. Four Nb₃Sn coils have been fabricated at CEA Saclay and CERN. This paper reports on the coil fabrication, describing the process, the issues encountered, and the solutions implemented. A series of geometrical and electrical characterizations were also performed on the coils in order to validate their quality. The coils are finally validated and ready to be assembled at CERN to form the magnet. The magnet assembly process is also described: the coils are assembled to form a coil pack, the coil pack is inserted in a shell-based support structure and pre-loaded at room temperature. The margins, expected in the different operation cases, are finally presented. (authors)