Evidence of Kramer extrapolation inaccuracy for predicting high field Nb<sub>3</sub>Sn properties

Segal, Christopher; Barth, C.; Falorio, I.; Zurita, Alejandro Carlon; Ballarino, A.; Chaud, X.; Tarantini, C.; Lee, Peter J.; Larbalestier, D. C.

doi:10.1088/1742-6596/1559/1/012062

Cited by 1 publication

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References 17 publications

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“…As shown by Baumgartner's work [27], the more inhomogeneous the wire stoichiometry, the greater the curvature in the pinning force tail as measured by magnetization at high field (resulting in a higher q value). Taking data from a limited field range cannot accurately determine the pinning force shape, and therefore the extrapolation accuracy depends on whether the assumed pinning force shape (determined at one measured temperature or set using default values) happens to fit the full range of temperature data's pinning force shape well, as shown by Segal and Tarantini's work [26,28]. This is the result of a mixed portion of low-B * C2 material in a wire that is represented by a single B * C2 value.…”

Section: Measurement Techniques and Issues In F-b Spacementioning

confidence: 99%

A procedural solution for determining the temperature dependence of transport critical current in Nb₃Sn superconducting wires using magnetization measurements

Pong¹,

Ekin²,

Baumgartner³

et al. 2022

Supercond. Sci. Technol.

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Using magnetization techniques to determine the temperature dependence of critical current in Nb3Sn wires is attractive because of their relative ease compared with variable-temperature transport measurements. However, there is a known mismatch in the temperature scaling characterizations when using magnetization data compared to transport data. From a practical standpoint, it is the transport properties that matter, as performance prediction, margin calculations, and other aspects of magnet designs rely on the knowledge of the amount of transport current the superconductor can carry in a magnetic field. In this paper, we will identify the underlying issues and propose a procedural solution for determining the temperature dependence of transport critical current in Nb3Sn superconducting wires using magnetization measurements. By using one standard transport measurement at 4.2 K as an “anchor”, with this procedural solution, it becomes possible to combine the simplicity and economy of quick magnetization measurements at different temperatures with accurate prediction of transport properties in extrapolated temperature ranges. This study is based on experimental data using internal tin type wire, but we also address the theoretical implications that would be generally applicable to other wire designs. The strength of our analysis is that our work leads to the proposed procedures that improve the accuracy of the temperature scaling even if the assumed pinning curve shape does not fit the data as well at some temperatures, whether those temperatures are close to 4.2 K or to TC.

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Section: Measurement Techniques and Issues In F-b Spacementioning

confidence: 99%

A procedural solution for determining the temperature dependence of transport critical current in Nb₃Sn superconducting wires using magnetization measurements

Pong¹,

Ekin²,

Baumgartner³

et al. 2022

Supercond. Sci. Technol.

View full text Add to dashboard Cite

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Evidence of Kramer extrapolation inaccuracy for predicting high field Nb₃Sn properties

Cited by 1 publication

References 17 publications

A procedural solution for determining the temperature dependence of transport critical current in Nb₃Sn superconducting wires using magnetization measurements

A procedural solution for determining the temperature dependence of transport critical current in Nb₃Sn superconducting wires using magnetization measurements

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Evidence of Kramer extrapolation inaccuracy for predicting high field Nb3Sn properties

Cited by 1 publication

References 17 publications

A procedural solution for determining the temperature dependence of transport critical current in Nb3Sn superconducting wires using magnetization measurements

A procedural solution for determining the temperature dependence of transport critical current in Nb3Sn superconducting wires using magnetization measurements

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Evidence of Kramer extrapolation inaccuracy for predicting high field Nb₃Sn properties

A procedural solution for determining the temperature dependence of transport critical current in Nb₃Sn superconducting wires using magnetization measurements

A procedural solution for determining the temperature dependence of transport critical current in Nb₃Sn superconducting wires using magnetization measurements