Hybrid round superconductor wires using Nb—Ti filaments
View Patent ↗A round superconductor wire, method for fabricating same, and method for detecting quench in the same are disclosed. A round superconductor wire includes a superconductor wire former and at least one superconductor tape wound on the superconductor wire former. Each superconductor tape includes a substrate, a buffer film stack overlying the substrate, and a superconductor film overlying the buffer film stack.
1. A round superconductor wire comprising:
a superconductor wire former; and
at least one superconductor tape wound on the superconductor wire former, each superconductor tape comprising:
a substrate;
a buffer film stack overlying the substrate; and
a superconductor film overlying the buffer film stack,
wherein the superconducting wire has an engineering current density (J e ) of 400-1500 A/mm 2 at 4.2 K, 20 T.
2. The round superconductor wire of claim 1 , wherein the superconductor wire former comprises a composition selected from a group consisting of Nb—Ti, Nb3Sn, MgB2, Bi—Sr—Ca—Cu—O, and combinations thereof.
3. The round superconductor wire of claim 1 , wherein the superconductor wire former comprises a plurality of superconductor filaments.
4. The round superconductor wire of claim 1 , wherein the superconductor wire former comprises a composite comprising a plurality of superconductor filaments embedded within a non-superconducting metal matrix.
5. The round superconductor wire of claim 1 , wherein the superconductor wire former comprises a composite comprising a plurality of Nb—Ti filaments embedded within a copper matrix.
6. The round superconductor wire of claim 1 , wherein the at least one superconductor tape comprises at least two superconductor tapes.
7. The round superconductor wire of claim 1 , wherein the round superconductor wire comprises a diameter of 1-3 mm, and the superconductor wire former comprises a diameter of 0.4-1.1 mm.
8. A method for fabricating a round superconductor wire, the method comprising:
providing a superconductor wire former; and
winding a superconductor tape around the superconductor wire former;
wherein the superconductor tape comprises:
a substrate;
a buffer film stack overlying the substrate; and
a superconductor film overlying the buffer film stack,
wherein the superconducting wire has an engineering current density (J e ) of 400-1500 A/mm 2 at 4.2 K, 20 T.
9. The method of claim 8 , wherein the superconductor wire former comprises a composition selected from a group consisting of Nb—Ti, Nb3Sn, MgB2, Bi—Sr—Ca—Cu—O, and combinations thereof.
10. The method of claim 8 , wherein the superconductor wire former comprises a plurality of superconductor filaments.
11. The method of claim 8 , wherein the superconductor wire former comprises a composite comprising a plurality of superconductor filaments embedded within a non-superconducting metal matrix.
12. The method of claim 8 , wherein the superconductor wire former comprises a composite comprising a plurality of Nb—Ti filaments embedded within a copper matrix.
13. The method of claim 8 , wherein the superconductor tape is a first superconductor tape, the method further comprises:
winding a second superconductor tape around the first superconductor tape;
wherein the second superconductor tape comprises:
a substrate;
a buffer film stack overlying the substrate; and
a superconductor film overlying the buffer film stack.
14. The method of claim 8 , wherein the round superconductor wire comprises a diameter of 1-3 mm, and the superconductor wire former comprises a diameter of 0.4-1.1 mm.
15. A method for detecting quench in a round superconductor wire, the method comprising:
employing the round superconductor wire in a coil configuration, wherein the round superconductor wire comprises a superconductor tape and a superconductor wire former on which the superconductor tape is wound; and
monitoring current or voltage distribution between the superconductor tape and the superconductor wire former.
16. The method of claim 15 , wherein the superconductor wire former comprises a composition selected from a group consisting of Nb—Ti, Nb3Sn, MgB2, Bi—Sr—Ca—Cu—O, and combinations thereof.
17. The method of claim 15 , wherein the superconductor wire former comprises a plurality of superconductor filaments.
18. The method of claim 15 , wherein the superconductor wire former comprises a composite comprising a plurality of superconductor filaments embedded within a nonsuperconducting metal matrix.
19. The method of claim 15 , wherein the superconductor wire former comprises a composite comprising a plurality of Nb—Ti filaments embedded within a copper matrix.
20. The method of claim 15 , wherein the round superconductor wire comprises a diameter of 1-3 mm, and the superconductor wire former comprises a diameter of 0.4-1.1 mm.