A probe for investigating the effects of temperature, strain, and magnetic field on transport critical currents in superconducting wires and tapes
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In this article, a variable-temperature probe has been developed to study the effect of strain on the transport properties of superconducting wires and tapes in high magnetic fields, by soldering it to a thick coiled spring and twisting one end of the spring with respect to the other.Abstract:
A variable-temperature probe has been developed to study the effect of strain on the transport properties of superconducting wires and tapes in high magnetic fields. The strain is applied to the wire by soldering it to a thick coiled spring and twisting one end of the spring with respect to the other. Strain can be applied reversibly from −0.7% to +0.7%. Measurements can be performed either in (pumped) cryogen or under vacuum. When immersed in liquid helium at 4.2 K, the probe can carry at least 200 A. From 6 to 16 K, with thin (low-loss) current leads the temperature of the sample is stable to ±45 mK for currents around 15 A, and to ±100 mK for currents around 25 A. With thick current leads, ±10 mK stability is achieved for currents up to 85 A. Full details of the probe design are described. Results obtained for a bronze processed niobium–tin multifilamentary wire are presented.read more
Citations
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The scaling law for the strain dependence of the critical current density in Nb3Sn superconducting wires
TL;DR: In this article, the critical current density (JC) of internal-tin and bronze-route Nb3Sn superconducting wires as a function of magnetic field (B?23?T), temperature (4.2?K?T?12?K) and axial strain (?1.6%??I?0.40%).
Journal ArticleDOI
Unified scaling law for flux pinning in practical superconductors: I. Separability postulate, raw scaling data and parameterization at moderate strains*
TL;DR: In this paper, the authors introduced the unified scaling law (USL) for the flux-pinning force per unit conductor length in practical high-field superconductors, where K(t,?0) is a temperature-and-strain dependent prefactor.
Journal ArticleDOI
A device to investigate the axial strain dependence of the critical current density in superconductors
Arno Godeke,Marc Dhalle,Alessio Morelli,L. Stobbelaar,H. van Weeren,H.J.N. van Eck,Wouter Abbas,Arend Nijhuis,A. den Ouden,B. ten Haken +9 more
TL;DR: In this article, the authors developed an instrument to study the behavior of the critical current density (Jc) in superconducting wires and tapes as a function of field, temperature, and axial applied strain.
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Operating strain effects in Nb3Sn cable-in-conduit conductors
TL;DR: In this paper, structural models are developed based on mechanical measurements on cable-in-conduit conductors which are able to successfully simulate the measured superconducting performance, and suggest that degradation observed in large cables is due to a combination of the repeated bending strain experienced by the strands and filament fracture, which is starting to occur to a significant extent in some large cables.
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Critical current versus strain research at the University of Twente
TL;DR: In this article, a U-shaped spring has been used to investigate the mechanical properties of a large variety of superconducting tapes and wires and several mechanisms are responsible for the degradation of critical current as a function of applied strain.
References
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TL;DR: The ASM Handbook as discussed by the authors provides a comprehensive and authoritative single-volume reference on nonferrous metals and alloys, with particular emphasis on aluminum, titanium, copper, and magnesium.
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TL;DR: The Materials Properties Handbook: Titanium Alloys as discussed by the authors provides a data base for information on titanium and its alloys, and the selection of specific alloys for specific applications, including applications, physical properties, corrosion, mechanical properties (including design allowances where available), fatigue, fracture properties, and elevated temperature properties.