Effect of axial strain cycling on the critical current density andn-value of ITER niobium-tin wires

Taylor, DMJ; Hampshire, DP

Abstract

Measurements have been made of the effect of axial strain cycling on the critical current density and n-value of two ITER candidate niobium-tin wires (Europa Metalli-LMI (EM-LMI) and Vacuumschmelze). The wires were subjected to similar to1300 strain cycles to incrementally increasing applied tensile strains, with 100 cycles per 0.056% increment. For both wires, there were no changes in the critical current density or n-value for the similar to500 cycles up to 0.282% applied strain (except for the first cycle of the EM-LMI wire). Cycling to higher applied strains (0.339-0.677%) caused the critical current density and n-value to incrementally increase at all applied strains, with the critical current density eventually increasing by 5-7% at 12 T and zero intrinsic strain. Cycling to applied strains above 0.677% (similar to0.4% intrinsic strain) damaged the wires. (C) 2003 Elsevier B.V. All rights reserved.

Citation

Taylor, D., & Hampshire, D. (2004). Effect of axial strain cycling on the critical current density andn-value of ITER niobium-tin wires. Physica C: Superconductivity and its Applications, 401(1-4), 40-46. https://doi.org/10.1016/j.physc.2003.09.009

• Journal Article Type: Article
• Publication Date: 2004-01
• Journal: Physica C: Superconductivity and its Applications
• Print ISSN: 0921-4534
• Publisher: Elsevier
• Volume: 401
• Issue: 1-4
• Pages: 40-46
• DOI: https://doi.org/10.1016/j.physc.2003.09.009
• Keywords: niobium-tin; strain cycling; fatigue; critical current density; n-valueMAGNETIC-FIELD; TEMPERATURE; CONDUCTORS