Fabrication and test of a LHC NbTi dipole model magnet with a split collar system

A model magnet having the full cross section of the twin-aperture dipole studied for the LHC (Large Hadron Collider) has been fabricated. To investigate various techniques, some special features have been developed for the magnet. The design details are discussed as well as the manufacturing and test of the magnet. The fabrication methods have shown to be feasible in an industrial manner. The highly compacted twin-aperture dipole reached 9.05 T at 2 K. This value corresponds to 92% of the short sample limit. At 4.2 K, the short sample limit of 9.7 T was obtained.>