Jelly Roll Processed Nb3Sn Wires with Improved Superconducting Performances.

Abstract: Jelly Roll (JR) processed Nb3Sn wires have been fabricated from laminated composites of Sn-based alloy and Nb sheets. The wires show an offset Tc of 18.1K with a transition width of less than 0.1K, and an offset Bc2 (4.2K) of 26.5T. The wire keeps Bc2 of ∼13T at 12K. Large non-Cu Jc values have been obtained at 4.2K and above 21T. Relative sheet thickness of the Sn-based alloy and Nb yields significant effect on the structure and Jc of the JR wire. [Copyright &y& Elsevier]