Nb3Sn cable development for the 11 T DS dipole demonstration model

Fermilab (FNAL) and CERN have started the development of 11 T 11-m long Nb3Sn dipoles to replace a number of LHC NbTi dipoles and free space for cold collimators in the LHC DS areas. An important step in the design of these magnets is the development of the high aspecept ratio Nb3Sn cable to achieve the nominal field of 11 T at the nominal LHC operation current of 11.8 kA at 1.9 with 20% margin. Keystoned Cu wires and Nb3Sn RRP strand both mechanical stability and minimal damage to the restack design to be used in the magnet short models. Each cable was characterized electrically for transport properties degradation at high field and for low feild stability, and metallographically for internal damage.

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