Finished conductor arrangement for an Nb3Sn superconductor wire and method for producing a sub-element for an Nb3Sn superconductor wire

摘要

In summary, the invention proposes to use a prefabricated conductor arrangement (20; 50) in the production of an Nb3Sn superconductor wire (33) according to the RRP principle, in which hexagonal RRP sub-elements (1a; 60a) form an approximately circular bundle in cross-section are combined and arranged together with filling elements (18a-18c) in an inner and outer round outer tube (19; 52). The filling elements (18a-18c) form a serrated profile (25) on the inside for contact with the hexagonal sub-elements (1a; 60a) and a round profile (24) on the outside for direct or indirect contact in the outer tube. This minimizes uneven deformations, in particular indentations, on the sub-elements (1a, 60a) when the finished conductor arrangement (20, 50) is deformed to reduce the cross-section. In the manufacture of the RRP sub-elements (1; 60), the invention proposes that they be manufactured with an outer hexagonal and inner round envelope structure (9), into which the remaining parts of the sub-element (1; 60) are inserted, before a cross-section-reducing deformation , in particular an annular arrangement of hexagonal Nb-containing rod elements (4) which are enclosed on the outside by an outer matrix (7, 61) and on the inside by an inner matrix (3). During a subsequent deformation of the sub-elements (1; 60) that reduces the cross-section, non-uniform deformations, in particular azimuthal material redistributions, are again minimized. Overall, an Nb3Sn superconductor wire (33) with a high superconducting current-carrying capacity and a minimized risk of Sn contamination in normally conductive areas, and thus a good protective function in the event of a quench, can be achieved.