Manufacturing of high (10 tesla) twin aperture superconducting dipole magnet for LHC

Details of the manufacturing process, electrical and mechanical measurements performed during fabrication, and test results are reported for a model of the 10-T twin aperture superconducting dipole magnet for the Large Hadron Collider (LHC). The model magnet uses NbTi superconducting cables at 1.8 K, and has a length of one meter with the cross section of full-scale superconducting dipoles for LHC. The coils are wound with insulated superconducting cables and cured under pressure for polymerization. Collaring is achieved with stamped aluminum alloy collars. The magnetic circuit consists of two half yokes of laminated iron. A shrunk-fit cylinder is the external structural element. This cylinder, which is made of aluminum alloy, is assembled after heating and then closed with an electron-beam welded flange. At 2 K the twin aperture magnet attained 8.9 T in seven quenches (88% of the short sample limit). At that field the stored energy is 542 kJ