Industrial development and engineering of a 1 meter twin-aperture superconducting dipole magnet for LHC

The authors discuss the technical solutions and experiences obtained related to the choice of construction materials and manufacturing procedures for a 1-m twin-aperture superconducting dipole magnet for the LHC (Large Hadron Collider). It is pointed out that the production development and engineering for a 10-T twin-aperture dipole magnet require sophisticated solutions for numerous problems. These problems concern the insulation and winding of the unsoldered superconducting cable, the application of wedges and spacers, the restraining of the coils, the mass insulation, the collars made of high strength aluminum alloy being non-magnetic and offering a high thermal contraction on cool-down, thus minimizing prestresses at room temperature, and the split iron yoke and the shrinking cylinder made from an aluminum-magnesium alloy having a higher thermal contraction to yield improved performance through reduced prestressing. After collaring of the superconducting coils had been completed, it was decided to investigate the effects of yoke and shrinking cylinder on the performance of the magnet by an interim cryogenic testing of the collared coils