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Scientific article
Open access
English

Effects of the initial axial strain state on the response to transverse stress of high-performance RRP Nb3Sn wires

Published inSuperconductor Science and Technology, vol. 34, no. 3, 035008
Publication date2021
Abstract

High-performance Nb3Sn superconducting wires have become one of the key technologies for the development of next generation accelerator magnets. While their large critical current densities enable the design of compact accelerator-quality magnets for their operation above 10 T, the noticeable reduction of the conductor performance due to mechanical strain appears as a new essential characteristic in magnet design. In this work, we extensively investigate the effect of transverse loads, up to 250 MPa, in state-of-the-art Nb3Sn Restacked-Rod-Process round superconducting wires. The tests are performed using a compressive Walters spring device, where the force is applied to the resin-impregnated wire, and the critical current is measured under magnetic fields ranging from 16 to 19 T. As a complement, critical current measurements under axial strain are also performed using a standard Walters spring. Interestingly, the study shows that the wire's electro-mechanical response under transverse stress depends on the initial axial strain condition. Nonetheless, when the main direction load becomes predominant, all tested wires converge to a common behavior. This observation allowed us to combine the results from critical current measurements under the loads exerted in both directions (axial and transverse), shedding some new light on the mechanisms behind critical current degradation.

Research group
Funding
  • European Commission - EuroCirCol
Citation (ISO format)
FERRADAS TROITINO, José et al. Effects of the initial axial strain state on the response to transverse stress of high-performance RRP Nb<sub>3</sub>Sn wires. In: Superconductor Science and Technology, 2021, vol. 34, n° 3, p. 035008. doi: 10.1088/1361-6668/abd388
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Article (Published version)
Identifiers
ISSN of the journal0953-2048
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Technical informations

Creation02/04/2021 10:37:00 PM
First validation02/04/2021 10:37:00 PM
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