Round Multifilament Bi-2212/Ag Wire Development for High Field Magnet Applications
Development efforts at Oxford Superconducting Technology (OST) have recently been aimed at manufacturing long length round wires with improvement of transport properties for high field magnet applications. Recently, significant improvements in the JE and Jc performance have been achieved by optimizing the starting precursor composition, the deformation processes, and the heat treatments. The highest JE of 1580 A/mm2 (Jc of 6140 A/mm2) at 4.2 K, 0 T, JE of 420 A/mm2 at 4.2 K, 31 T and JE of 312 A/mm2 at 20 K, 2 T were obtained in 0.81 mm wire with the optimized condition. In addition, significant progress on braided insulation has been made for enabling a robust procedure for wind-and-react Bi-2212 solenoid coils. Ic and generated field have been measured in a series of such coils of increasing dimensions. In this paper the progress on the development of Bi-2212 round wires and coils will be reported.
Yafang Han et al.
H. P. Miao et al., "Round Multifilament Bi-2212/Ag Wire Development for High Field Magnet Applications", Materials Science Forum, Vols. 546-549, pp. 1927-1930, 2007