On the current transfer length and current sharing in short length MgB<sub>2</sub>wires

Vinod, K.; Varghese, Neson; Rahul, S.; Devadas, K. M.; Thomas, Shiny; Gurusamy, P; Kedia, Sunil; Pradhan, Subrata; Syamaprasad, U.

doi:10.1088/0953-2048/23/10/105002

Cited by 10 publications

(3 citation statements)

References 20 publications

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“…Provided that the CTL can be easily measured or even determined analytically for such tape architectures, it suggests that the CTL is a good indicator of tape robustness against hot spots: the longer it is, the larger the NZPV. The CTL is thus an important characteristic of superconducting tapes and wires, and it has been intensively studied over the years for multi-filamentary low temperature superconductors [8][9][10], for MgB 2 wires [11][12][13] and of course for 2G HTS CCs [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Concepts of static vs. dynamic current transfer length in 2G HTS coated conductors with a current flow diverter architecture

Fournier-Lupien¹,

Sirois²,

Lacroix³

2021

Supercond. Sci. Technol.

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This paper uses both experimental and numerical approaches to revisit the concept of current transfer length (CTL) in second-generation high-temperature superconductor coated conductors with a current flow diverter (CFD) architecture. The CFD architecture has been implemented on eight commercial coated conductor samples from THEVA. In order to measure the 2D current distribution in the silver stabilizer layer of the samples, we first used a custom-made array of 120 voltage taps to measure the surface potential distribution. Then, the so-called ‘static’ CTL () was extracted using a semi-analytical model that fitted well the experimental data. As defined in this paper, the static CTL on a 2D domain is a generalization of the definition commonly used in literature. In addition, we used a 3D finite element model to simulate the normal zone (NZ) propagation in our CFD samples, in order to quantify their ‘dynamic’ CTL (), a new concept introduced in this paper and defined as the CTL observed during the propagation of a quenched region. The results show that, for a CFD architecture, is always larger than , whereas when the interfacial resistance between the stabilizer and the superconductor layers is the same everywhere. We proved that the cause of these different behaviors is related to the shape of the NZ, which is curved for the CFD architecture, and rectangular otherwise. Finally, we showed that the normal zone propagation velocity (NZPV) is proportional to , not with , which suggests that the dynamic CTL is the most general definition of the CTL and should always be used when current crowding and non-uniform heat generation occurs around a NZ.

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Section: Introductionmentioning

confidence: 99%

Concepts of static vs. dynamic current transfer length in 2G HTS coated conductors with a current flow diverter architecture

Fournier-Lupien¹,

Sirois²,

Lacroix³

2021

Supercond. Sci. Technol.

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“…The value of copper resistivity at 4.2 K, q = 2 Â 10 À11 X m used in current transfer length calculations [22] is not a realistic one.…”

Section: Resistivity Of the Copper Matrix Between The Filamentsmentioning

confidence: 99%

AC losses and transverse resistivity in filamentary MgB2 tape with Ti barriers

Polák¹,

Demenčík²,

Hušek³

et al. 2011

Physica C: Superconductivity

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“…Provided that the CTL can be easily measured or even determined analytically for such tape architectures, it suggests that the CTL is a good indicator of tape robustness against hot spots: the longer it is, the larger is the NZPV. The CTL is thus an important characteristic of superconducting tapes and wires, and it has been intensively studied over the years for multi-filamentary low temperature superconductors [8][9][10], for MgB 2 wires [11][12][13] and of course for 2G HTS CCs [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Concepts of Static vs. Dynamic Current Transfer Length in 2G HTS coated conductors with a Current Flow Diverter Architecture

Fournier-Lupien,

Sirois,

Lacroix

2021

Preprint

View full text Add to dashboard Cite

This paper uses both experimental and numerical approaches to revisit the concept of current transfer length (CTL) in second-generation high-temperature superconductor coated conductors with a current flow diverter (CFD) architecture. The CFD architecture has been implemented on eight commercial coated conductors samples from THEVA. In order to measure the 2-D current distribution in the silver stabilizer layer of the samples, we first used a custom-made array of 120 voltage taps to measure the surface potential distribution. Then, the so-called "static" CTL (λs) was extracted using a semi-analytical model that fitted well the experimental data. As defined in this paper, the static CTL on a 2-D domain is a generalization of the definition commonly used in literature. In addition, we used a 3-D finite element model to simulate the normal zone propagation in our CFD samples, in order to quantify their "dynamic" CTL (λ d ), a new concept introduced in this paper and defined as the CTL observed during the propagation of a quenched region. The results show that, for a CFD architecture, λ d is always larger than λs, whereas λ d = λs when the interfacial resistance between the stabilizer and the superconductor layers is the same everywhere. We proved that the cause of these different behaviors is related to the shape of the normal zone, which is curved for the CFD architecture, and rectangular otherwise. Finally, we showed that the NZPV is proportional to λ d , not with λs, which suggests that the dynamic CTL λ d is the most general definition of the CTL and should always be used when current crowding and non-uniform heat generation occurs around a normal zone.

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On the current transfer length and current sharing in short length MgB₂wires

Cited by 10 publications

References 20 publications

Concepts of static vs. dynamic current transfer length in 2G HTS coated conductors with a current flow diverter architecture

Concepts of static vs. dynamic current transfer length in 2G HTS coated conductors with a current flow diverter architecture

AC losses and transverse resistivity in filamentary MgB2 tape with Ti barriers

Concepts of Static vs. Dynamic Current Transfer Length in 2G HTS coated conductors with a Current Flow Diverter Architecture

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On the current transfer length and current sharing in short length MgB2wires

Cited by 10 publications

References 20 publications

Concepts of static vs. dynamic current transfer length in 2G HTS coated conductors with a current flow diverter architecture

Concepts of static vs. dynamic current transfer length in 2G HTS coated conductors with a current flow diverter architecture

AC losses and transverse resistivity in filamentary MgB2 tape with Ti barriers

Concepts of Static vs. Dynamic Current Transfer Length in 2G HTS coated conductors with a Current Flow Diverter Architecture

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On the current transfer length and current sharing in short length MgB₂wires