Strand level modeling of contact resistance and coupling loss for EU-DEMO-TF prototype conductors

Bagni, Tommaso; Devred, A.; Nijhuis, A.

doi:10.1088/1361-6668/ab37c7

Cited by 4 publications

(2 citation statements)

References 22 publications

(57 reference statements)

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“…The JackPot AC/DC model can simulate CICC type conductors based on the cabling subroutine that calculates the trajectories of all superconducting and copper strands inside the cable [13,16]. All involved model parameters are obtained from the geometrical dimensions and experimental data.…”

Section: Jackpot Numerical Network Modelmentioning

confidence: 99%

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DC performance and AC loss of sub-size MgB₂ CICC conductor for fusion magnet application

Gao¹,

He²,

Ma³

et al. 2022

Nucl. Fusion

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Given the low price and relatively high transition temperature (39 K) of MgB2 conductor, MgB2-based superconductors are a potential candidate for the lower field fusion coils, such as Poloidal Field (PF) coils, Correction Coils (CC) and Feeders. However, to date, the application of MgB2 is limited to demonstrators in a low magnetic field of up to 5 T and at temperatures of up to 10 to 20 K, relying on cryogen-free, helium gas or liquid hydrogen cooling, which significantly reduce the cost of cryogenic systems. To demonstrate the feasibility and performance verification of large size MgB2 PF conductors based on ITER and CFETR requirements, a 4th-stage subsize MgB2 Cable-In-Conduit Conductor (CICC) cable sample is made at the Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP). The CICC contains 96 in-situ MgB2 superconducting wires, manufactured by Western Superconducting Technology Ltd. (WST) and 48 copper wires. The critical current of the sub-size cables and MgB2 witness wires are examined with different background magnetic fields at 4.2 K. In addition, the AC loss is measured utilizing magnetization and calorimetric methods. To further clarify the influence of electromagnetic force on the AC loss performance, the cable sample is pressed transversely at room temperature and then inserted into a dipole magnet for AC loss measurement at 4.2 K. The critical current at 4.2 K of the subsize MgB2 CICC cable shows 20% degradation compared to the witness wires at 2 T background magnetic field. However, no further critical current degradation is visible during ramping up and down the magnetic field. The coupling loss time constant for 1 T background magnetic field amounts to 480 ms. No significant effect of the applied transverse stress on the coupling loss is observed between 0 and 10 MPa.

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Section: Jackpot Numerical Network Modelmentioning

confidence: 99%

“…Starting from the cable design, JackPot can generate a complete CICC geometry, with strand level detail, using the experimentally determined strand properties with mutual inductive coupling between strands and coupling with the applied magnetic field. More details about JackPot are reported in [16].…”

Section: Jackpot Numerical Network Modelmentioning

confidence: 99%

DC performance and AC loss of sub-size MgB₂ CICC conductor for fusion magnet application

Gao¹,

He²,

Ma³

et al. 2022

Nucl. Fusion

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AC loss and contact resistance of different CICC cable patterns: Experiments and numerical modeling

Anvar

Qin

Wang

et al. 2020

Fusion Engineering and Design

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Examination of design parameters affecting Nb₃Sn CICC current sharing temperature using necessary condition analysis

Kwon¹

2021

Supercond. Sci. Technol.

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The performance of Nb3Sn cable-in-conduit conductor (CICC) especially its current sharing temperature (T cs) is known to depend on the various parameters of the CICC such as the Nb3Sn strand characteristics, its cabling, the final geometry of the CICC cross section, the void fraction, the current distribution and other parameters. However, the performance has not been very predictable. The change in CICC T cs performance with repeated operation or electromagnetic loading is of particular concern. Furthermore, evaluation of T cs performance with respect to parametric variation of some CICC parameters has resulted in conflicting conclusions for different CICC designs. Thus, a more comprehensive review of published CICC T cs performance with respect to the corresponding CICC cable characteristics has been performed and is reported here for CICC samples whose designs and test results have been published during the past decade and more. Necessary condition analysis as well as linear regression is applied in the interpretation of the results which has found that the first stage cable twist pitch which has been the focus of much research is not that significant in determining the T cs performance but does affect T cs degradation. The direct effect of strand critical current on T cs performance was also found to be weak. On the other hand, void fraction was found to be significant in both determining T cs performance and limiting T cs degradation. Other correlations between parameters have also been studied. Overall, it seems that there has been appropriate targeting as well as overemphasis on some CICC parameters for improving Nb3Sn CICC T cs performance. No single parameter studied has been found to be a determining factor for high stable CICC T cs performance. Research on additional parameters is warranted.

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Strand level modeling of contact resistance and coupling loss for EU-DEMO-TF prototype conductors

Cited by 4 publications

References 22 publications

DC performance and AC loss of sub-size MgB₂ CICC conductor for fusion magnet application

DC performance and AC loss of sub-size MgB₂ CICC conductor for fusion magnet application

AC loss and contact resistance of different CICC cable patterns: Experiments and numerical modeling

Examination of design parameters affecting Nb₃Sn CICC current sharing temperature using necessary condition analysis

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Strand level modeling of contact resistance and coupling loss for EU-DEMO-TF prototype conductors

Cited by 4 publications

References 22 publications

DC performance and AC loss of sub-size MgB2 CICC conductor for fusion magnet application

DC performance and AC loss of sub-size MgB2 CICC conductor for fusion magnet application

AC loss and contact resistance of different CICC cable patterns: Experiments and numerical modeling

Examination of design parameters affecting Nb3Sn CICC current sharing temperature using necessary condition analysis

Contact Info

Product

Resources

About

DC performance and AC loss of sub-size MgB₂ CICC conductor for fusion magnet application

DC performance and AC loss of sub-size MgB₂ CICC conductor for fusion magnet application

Examination of design parameters affecting Nb₃Sn CICC current sharing temperature using necessary condition analysis