Fabrication method of high-temperature superconduction ReBCO cable structure applied to CICC

Abstract

The invention discloses a fabrication method of high-temperature superconduction ReBCO cable structure applied to CICC. A ReBCO superconduction strip, a copper / aluminum filling tape, a copper wrappingtape and a spiral superconduction strip which are laminated form a circular superconduction line structure, the requirements of high critical current and high carrier density of a large-size magnet can be met, the superconduction ReBCO cable structure also has favorable mechanical characteristic, and the deformation demand such as bending during the manufacturing process of the magnet is satisfied; and more importantly, compared with an existing international ReBCO CICC superconduction cable design, the engineering critical current density is improved by 20% or above (for a small-size ReBCO CICC superconduction cable, the maximum improvement of the engineering critical current density can exceed that of current international researched superconduction cable by one time, so that the problem of cable twisting of the ReBCO superconduction strip during the application process of the CICC superconduction cable is solved, the cost of two-generation high-temperature superconductor in application of a large-size conductor is further reduced.

Description

technical field [0001] The invention relates to a method for manufacturing a high-temperature superconducting ReBCO cable structure applied to CICC, and belongs to the technical field of cable manufacturing. Background technique [0002] In-tube cable conductor (Cable-In-Conduit-Condctor, CICC) has the advantages of good rigidity and mechanical stability, low AC loss and less low-temperature cooling medium required for operation, and has large current and rapidly changing magnetic field in fusion It is widely used in devices with operational requirements. At present, CICC generally adopts NbTi and Nb 3 Sn is two superconducting materials. Among them, the critical field of the NbTi superconductor is 11T at 4.2K, so the NbTi CICC conductor is mainly used in the manufacture of low-field magnets; 3 Although the upper critical field of Sn superconductor can be as high as 27T at 4.2K, its current-carrying performance will decay rapidly with the increase of the magnetic field, a...

AI Technical Summary

Problems solved by technology

The widely used CICC conductor technology uses isotropic superconducting wires, and the anisotropic ReBCO tape brings certain difficulties to the design and development of CICC superconducting cables.

At present, there are three main structures based on YBCO strips and can be considered as ReBCO CICC superconducting wires / cables, namely superconducting flat ribbon transposed (Roebel) composite conductors, superconducting twisted stack (TSTC) composite conductors and spiral composite conductors. Conductor (CORC), these three structural composite conductors have their own advantages and disadvantages. Among them, Roebel cable is made of multiple strips, and its width is much larger than that of conventional cables. However, it has limitations in the bending process of magnet manufacturing; twisted stacked strip composite structure It is to stack multiple strips and then bind them with steel wires and fix them with solder. This kind of structure has a large performance degradation after being subjected to electromagnetic force, and the thickness of the stack is relatively large, so it can only be wound on a cylinder or polygon with a large radius. On the cylinder; the helical composite conductor is to wind the superconducting tape on the solid core material, and wrap it with insulating material on the outside. In view of the stress-strain characteristics of the ReBCO tape, the core material needs to reach a certain size. This in turn reduces the engineering current density of the CICC conductor

At present, there is no unified approval structure for ReBCO superconducting cables suitable for CICC, but the goal is to have high current-carrying performance and mechanical properties, and at the same time meet the needs of large-scale magnet manufacturing

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