MANUFACTURE AND ANALYSIS OF INTERNAL-TIN MODIFIED JELLY ROLL CABLES FOR THE 45T HYBRID MAGNET

The 45T hybrid magnet being constructed by the National High Magnetic Field Laboratory will generate the world's highest steady magnetic fie ld, The coil is composed of four sections: A Nb-Ti outsert, two Nb3Sn outserts and a water cooled resistive insert. Teledyne Wah Chang produ ced the wire for the Nb,Sn coils (A and B) and oversaw the cabling, Th e wire design for the 45T hybrid magnet is a modified version of TWC's Nb diffusion barrier wire, This wire design provides excellent contro l of the I-c and hysteresis loss. Coil A is composed of 525, 0.43mm di ameter wires 939m in length. Coil B is a two piece cable composed of 3 15, 0.51mm diameter wires. The lengths of the Coil B pieces are 844m a nd 623m. The I-c, ''n''-value and hysteresis loss of the wire are show n to be uniform. The variability in RRR for each coil is discussed. Th e results of triplet test cables are also reported.