Engineering Design of a Large Aperture 15 T Cable Test Facility Dipole Magnet

The Nb3Sn based test facility dipole magnet (TFD), with a rectangular aperture of 100 x 150 mm, and an operation target bore field of 15Tat 1.9 K, is designed to provide a background dipole field for cables and inserts. The design of the magnet is based on four double-layer coils and an aluminum shell-based structure, using key-and-bladder technology, with axial pre-load. The status of the magnet design, and optimization analyses, are here presented. The results of the initial prototyping, initialwinding tests, characterization of cable hard-way bend curvature, and layer jump prototype test are also discussed.