High Field Magnet Design At BNL (Nb3Sn, “React & Wind”, in first stage)
Expected Short Sample: ~12.5 T
No. of strand (both layers): 30
Strand diameter (both layers) 0.8 mm
Cu/Sc: 1.0 (inner); 1.86 (outer)
Jcu: 1400-1500 A/mm2 (both layers)
A unique feature of this design: Variable grading with two power supplies
Allows the studies of cable behavior as it sees in the magnet.
Example: Vary current density in Cu@Quench dynamically
Perhaps first such study in real magnet situation
Important design parameter, results useful for future designs