Manufacturing of Nb<sub>3</sub>Sn Sample Conductor for CFETR Central Solenoid Model Coil

Qin, Jing; Wu, Yu; Xiang, Bing Lun; Dai, Chao; Mao, Zhe Hua; Jin, Huan; Liao, Guo Jun; Liu, Fang; Xue, Tianjun; Wei, Zhou; Devred, A.; Nijhuis, A.; Zhou, Chao

doi:10.1109/tasc.2017.2654338

Cited by 16 publications

(6 citation statements)

References 14 publications

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“…If the V f values of the reviewed CICCs represent the optimal values for the given cable design, the conclusion is that smaller V f is attained more frequently with larger L p1 /D s , or in other terms, that strands in cable with smaller L p1 /D s ratio can get damaged more easily during CICC manufacturing than if the ratio were larger, a postulate with some evidentiary observations [16,19,23,24,32,37,51,52]. Furthermore, the observed correlation of decreasing V f with increasing L p1 /D s would suggest that whatever phenomenon appears at large V f may be observed at small L p1 /D s and vice versa explaining the seeming mirror images between figures 5(c) and 6(c).…”

Section: Void Fraction Vs First Stage Sub-cable Twist Pitchmentioning

confidence: 99%

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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Section: Void Fraction Vs First Stage Sub-cable Twist Pitchmentioning

confidence: 99%

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

Kwon¹

2021

Supercond. Sci. Technol.

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“…ITER TF and CFETR CSMC, is described. The components of the cable in the model include petals, central cooling spiral, and wrap, as shown schematically in figure 3 [5,21].…”

Section: Numerical Modelmentioning

confidence: 99%

“…Eventually, the cable has more than 1000 strands, e.g. ITER TF has 900 Nb 3 Sn and 522 copper strands, shown in figure 1 [5]. To form a cable-inconduit conductor (CICC), a cable is inserted into a jacket under tensile force [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Rotation analysis on large complex superconducting cables based on numerical modeling and experiments

Qin

Yue

Zhang

et al. 2017

Supercond. Sci. Technol.

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The conductors used in large fusion reactors, e.g. ITER, CFETR and DEMO, are made of cable-inconduit conductor (CICC) with large diameters up to about 50 mm. The superconducting and copper strands are cabled around a central spiral and then wrapped with stainless-steel tape of 0.1 mm thickness. The cable is then inserted into a jacket under tensile force that increases with the length of insertion. Because the cables are long and with a large diameter, the insertion force could reach values of about 40 kN. The large tensile force could lead to significant rotation forces. This may lead to an increase of the twist pitch, especially for the final one. Understanding the twist pitch variation is very important; in particular, the twist pitch of a cable inside a CICC strongly affects its properties, especially for Nb 3 Sn conductors. In this paper, a simplified numerical model was used to analyze the cable rotation, including material properties, cabling tension as well as wrap tension. Several rotation experiments with tensile force have been performed to verify the numerical results for CFETR CSMC cables. The results show that the numerical analysis is consistent with the experiments and provides the optimal cabling conditions for large superconducting cables.

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“…Meanwhile, it's a big challenge to design and fabricate the CS coils due to its operating conditions. In order to develop the technology for superconducting coils, the CSMC project for the CFETR was set up as top priority since 2014 [2,3].…”

Section: Introductionmentioning

confidence: 99%

Stability analysis on Nb3Sn sample conductor of CFETR central solenoid model coil

Mei

et al. 2018

Fusion Engineering and Design

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Manufacturing of Nb₃Sn Sample Conductor for CFETR Central Solenoid Model Coil

Cited by 16 publications

References 14 publications

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

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

Rotation analysis on large complex superconducting cables based on numerical modeling and experiments

Stability analysis on Nb3Sn sample conductor of CFETR central solenoid model coil

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Manufacturing of Nb3Sn Sample Conductor for CFETR Central Solenoid Model Coil

Cited by 16 publications

References 14 publications

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

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

Rotation analysis on large complex superconducting cables based on numerical modeling and experiments

Stability analysis on Nb3Sn sample conductor of CFETR central solenoid model coil

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Product

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Manufacturing of Nb₃Sn Sample Conductor for CFETR Central Solenoid Model Coil

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

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