Design, fabrication variants and results of LHC twin-aperture models

In the framework of the R&D program for the development of high-field superconducting magnets suitable for LHC (Large Hadron Collider), four twin-aperture, 1 m long, dipole models have been contracted to industry. The magnets are working at superfluid helium temperature below 2 K. The value of the maximum central magnetic field at the short sample limit is 10 T. The main design characteristics and principles of construction are recalled. The four models have technical variants which are described. Superconducting cables of 17 mm width have been developed in collaboration with industry. The measured critical current densities on cables and results of magnet tests are reported