Torsional Dependence of the Critical Current in 2G Tapes

Since the second-generation (2G) superconducting wires started to be produced in a large scale almost a decade ago, the quality of the materials manufactured has been continually improved. Every year, the manufacturers present new materials with better electrical properties, increasing the critical current density, critical magnetic field, and the total length produced with continuous homogeneity. The mechanical properties of the coated conductor should be taken into account since electro-dynamical forces appear in working conditions as stress in the cooling and heating processes. In applications such as fault-current limiters, superconducting magnetic energy storage, transformers, electromagnets, motors, cables, etc., the consideration of them is mandatory to the project of those devices. In this context, this paper studies the electrical and mechanical properties of 12-mm 2G wires samples under torsion without axial tension. Critical current is measured as a function on the torsion angle. Details of the experiment and their results are here presented.