The Importance of Being Prestressed

Rupp, G.

doi:10.1007/978-1-4684-3887-1_12

Cited by 20 publications

(2 citation statements)

References 26 publications

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“…Interlaboratory comparisons of variable-strain J C data for the internal-tin and bronze-route wires and cables are shown in figure 1, where the normalized critical current at 4.2 K and 13 T is plotted as a function of intrinsic strain. Intrinsic strain (generally assumed to be the total axial strain on the superconducting filaments) is defined as [11,35,48,52]…”

Section: Interlaboratory Comparisonsmentioning

confidence: 99%

The scaling law for the strain dependence of the critical current density in Nb₃Sn superconducting wires

Taylor

Hampshire

2005

Supercond. Sci. Technol.

117

132

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Comprehensive measurements are reported of the critical current density (J C) of internal-tin and bronze-route Nb 3 Sn superconducting wires as a function of magnetic field (B 23 T), temperature (4.2 K T 12 K) and axial strain (−1.6% ε I 0.40%). Electric field-temperature characteristics are shown to be equivalent to the standard electric field-current density characteristics to within an experimental uncertainty of ∼20 mK, implying that J C can be described using thermodynamic variables. We report a new universal relation between normalized effective upper critical field (B * C2 (0)) and strain that is valid over a large strain range for Nb 3 Sn wires characterized by high upper critical fields. A power-law relation between B * C2 (0, ε I) and T * C (ε I) (the effective critical temperature) is observed with an exponent of ∼2.2 for high-upper-critical-field Nb 3 Sn compared to the value 3 for binary Nb 3 Sn. These data are consistent with microscopic theoretical predictions and suggest that uniaxial strain predominantly affects the phononic rather than the electronic properties of the material. The standard Summers scaling law predicts a weaker strain dependence than is observed. We propose a scaling law for J C (B, T , ε I) based on microscopic theory and phenomenological scaling that is sufficiently general to describe materials with different impurity scattering rates and electron-phonon coupling strengths. It parametrizes complete datasets with a typical accuracy of ∼4%, and provides reasonable predictions for the J C (B, T , ε I) surface from partial datasets.

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Section: Interlaboratory Comparisonsmentioning

confidence: 99%

The scaling law for the strain dependence of the critical current density in Nb₃Sn superconducting wires

Taylor

Hampshire

2005

Supercond. Sci. Technol.

117

132

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“…The Young's modulus in the filament area is in force F ϭ J ϫ B leads to hoop stresses, related to the radius the range of 130 GPa and for the bronze between 50 GPa to of the winding. Therefore, ϭ J ϫ B ϫ r, where r is the 80 GPa (40). The value for the bronze depends on the depleradius, leads to very large forces, which makes special reintion of the Sn.…”

Section: Degradation By Cablingmentioning

confidence: 99%

Superconductors, Metallurgy of Beta Tungsten

Dietrich

1999

Wiley Encyclopedia of Electrical and Electronics Engineering

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30Mei1 - 73Kit1

Flükiger¹,

Wolf²

Nb, Nb-Al - Nb-Ge

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The Importance of Being Prestressed

Cited by 20 publications

References 26 publications

The scaling law for the strain dependence of the critical current density in Nb₃Sn superconducting wires

The scaling law for the strain dependence of the critical current density in Nb₃Sn superconducting wires

Superconductors, Metallurgy of Beta Tungsten

30Mei1 - 73Kit1

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The Importance of Being Prestressed

Cited by 20 publications

References 26 publications

The scaling law for the strain dependence of the critical current density in Nb3Sn superconducting wires

The scaling law for the strain dependence of the critical current density in Nb3Sn superconducting wires

Superconductors, Metallurgy of Beta Tungsten

30Mei1 - 73Kit1

Contact Info

Product

Resources

About

The scaling law for the strain dependence of the critical current density in Nb₃Sn superconducting wires

The scaling law for the strain dependence of the critical current density in Nb₃Sn superconducting wires