Manufacture and analysis of internal-tin modified jelly roll cables for the 45 T hybrid magnet

摘要

The 45 T hybrid magnet being constructed by the National High Magnetic Field Laboratory will generate the world's highest steady magnetic field. The coil is composed of four sections: A Nb-Ti outsert, two Nb/sub 3/Sn outserts and a water cooled resistive insert. Teledyne Wah Chang produced the wire for the Nb/sub 3/Sn coils (A and B) and oversaw the cabling. The wire design for the 45 T hybrid magnet is a modified version of TWC's Nb diffusion barrier wire. This wire design provides excellent control of the I/sub c/ and hysteresis loss. Coil A is composed of 525, 0.43 mm diameter wires 939 m in length. Coil B is a two piece cable composed of 315, 0.51 mm diameter wires. The lengths of the coil B pieces are 844 m and 623 m. The I/sub c/, "n"-value and hysteresis loss of the wire are shown to be uniform. The variability in RRR for each coil is discussed. The results of triplet test cables are also reported.