DEVELOPMENT OF AN EXPERIMENTAL 10 T NB3SN DIPOLE MAGNET FOR THE CERN LHC

An experimental 1 meter long twin aperture dipole magnet is developed using a high current density Nb3Sn conductor in order to attain a magnetic field well beyond 10 T at 4.2 K. The emphasis in this Nb3Sn project is on the highest possible field within the known LHC twin aperture configuration. A design target of 11.5 tesla was chosen, a value which can be achieved with the presently available Nb3Sn. Though the basic properties of this experimental magnet are the same as those of the reference design, a few new solutions are implemented. The arrangement of the conductors in the magnet cross section has been optimized in a different way also leading to new dimensions of the conductors. The collaring part of the force retaining structure has been changed. The solution of a shrink fit collar has been adopted instead of a conventional collar with pin locking. Further on the two coil systems in the twin aperture magnet are assembled and collared separately instead of using a twin collar enclosing both coil systems. The paper reports on the various design aspects and the present state of development is presented.