Bending strain tolerance of MgB<sub>2</sub>superconducting wires

Kòváč, Pavol; Hušek, I; Melíšek, T; Kulich, M; Kopera, Ľ

doi:10.1088/0953-2048/29/4/045002

Cited by 18 publications

(21 citation statements)

References 23 publications

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“…This value is too large for a mono-core round wire. Even the I c of a multi-core wire of MgB 2 , in which the effect of bending strain on I c is weaker than that in a mono-core wire, is reduced to less than half at the same bending strain [21]. For react and wind method, multi-core round wire should be developed and the relation between the core area and coil diameter should be considered.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of superconducting coils and (Ba,A)Fe₂As₂ (A:Na, K) long round wires with large superconducting cores

Pyon

Ito²,

Tamegai³

et al. 2022

J. Phys.: Conf. Ser.

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We fabricated superconducting coils using 10-20 m-class round wires of 122-type iron-based superconductors (IBSs). Round wires and coils are fabricated by powder-in-tube method and hot-isostatic-press technique. Transport critical current (I c) of the whole (Ba,K)Fe2As2 coil is 46 A under the self-field at 4.2 K, and magnetic field at the center of the coil reaches 0.3 T. Although the edge of the long wire in the coil is damaged, the rest of the part is relatively homogeneous. Furthermore, the largest transport critical current density (J c) and I c in (Ba,K)Fe2As2 wires picked up from the coil reach 49 kAcm−2 and 44 A at 4.2 K under a magnetic field of 10 T, respectively. This value exceeds the previous highest transport J c of (Ba,K)Fe2As2 round wires. We also fabricated a (Ba,Na)Fe2As2 coil using long round wire with large superconducting core by react and wind method. Transport I c of the coil is significantly low due to cracks perpendicular to electric current flow direction, although magnetic J c in the round wire picked up from the coil reaches 40 kAcm−2 at 4.2 K under 4 T.

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Section: Resultsmentioning

confidence: 99%

Fabrication of superconducting coils and (Ba,A)Fe₂As₂ (A:Na, K) long round wires with large superconducting cores

Pyon

Ito²,

Tamegai³

et al. 2022

J. Phys.: Conf. Ser.

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“…The minimum bending radius depends on the superconducting wire design and leads to critical current degradation. A typical MgB 2 wire has a minimum bending radius of about 40 mm [28]. However, this effect strongly depends on the conductor design and was not taken into account in the model.…”

Section: Resultsmentioning

confidence: 99%

Topology Comparison of Superconducting AC Machines for Hybrid Electric Aircraft

Corduan

Boll

Bause

et al. 2020

IEEE Trans. Appl. Supercond.

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Electric machines with very power-to-weight ratios are inevitable for hybridelectric aircraft applications. One potential technology that is very promising to achieve the required power-to-weight ratio for short-range aircraft, are superconductors used for high current densities in the stator or high magnetic fields in the rotor. In this paper, we present an indepth analysis of the potential for fully and partially superconducting electric machines that is based on an analytical approach taking into account all relevant physical domains such as electromagnetics, superconducting properties, thermal behavior as well as structural mechanics. For the requirements of the motors in the NASA N3-X concept aircraft, we find that fully superconducting machines could achieve 3.5 times higher power-to-weight ratio than partially superconducting machines. Furthermore, our model can be used to calculate the relevant KPIs such as mass, efficiency and cryogenic cooling requirements for any other machine design.

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“…Others superconducting wires based on powder metallurgy, as Iron-based 54 and MgB 2 wires 55 , could also benefit from tomography analysis by analyzing, for example, the interaction between the metal sheath and the superconducting phase. The technique can also be applied in in-situ MgB 2 wires for the investigation of the voids formation, due to volume contraction during the synthesis process, which could be detrimental for J c and mechanical limits 55 – 57 . Finally, the tool is not limited to study single wires, more complex system can also benefit from its use.…”

Section: Discussionmentioning

confidence: 99%

Machine learning applied to X-ray tomography as a new tool to analyze the voids in RRP Nb3Sn wires

Bagni¹,

Bovone²,

Rack³

et al. 2021

Sci Rep

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The electro-mechanical and electro-thermal properties of high-performance Restacked-Rod-Process (RRP) Nb3Sn wires are key factors in the realization of compact magnets above 15 T for the future particle physics experiments. Combining X-ray micro-tomography with unsupervised machine learning algorithm, we provide a new tool capable to study the internal features of RRP wires and unlock different approaches to enhance their performances. Such tool is ideal to characterize the distribution and morphology of the voids that are generated during the heat treatment necessary to form the Nb3Sn superconducting phase. Two different types of voids can be detected in this type of wires: one inside the copper matrix and the other inside the Nb3Sn sub-elements. The former type can be related to Sn leaking from sub-elements to the copper matrix which leads to poor electro-thermal stability of the whole wire. The second type is detrimental for the electro-mechanical performance of the wires as superconducting wires experience large electromagnetic stresses in high field and high current conditions. We analyze these aspects thoroughly and discuss the potential of the X-ray tomography analysis tool to help modeling and predicting electro-mechanical and electro-thermal behavior of RRP wires and optimize their design.

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Bending strain tolerance of MgB₂superconducting wires

Cited by 18 publications

References 23 publications

Fabrication of superconducting coils and (Ba,A)Fe₂As₂ (A:Na, K) long round wires with large superconducting cores

Fabrication of superconducting coils and (Ba,A)Fe₂As₂ (A:Na, K) long round wires with large superconducting cores

Topology Comparison of Superconducting AC Machines for Hybrid Electric Aircraft

Machine learning applied to X-ray tomography as a new tool to analyze the voids in RRP Nb3Sn wires

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Bending strain tolerance of MgB2superconducting wires

Cited by 18 publications

References 23 publications

Fabrication of superconducting coils and (Ba,A)Fe2As2 (A:Na, K) long round wires with large superconducting cores

Fabrication of superconducting coils and (Ba,A)Fe2As2 (A:Na, K) long round wires with large superconducting cores

Topology Comparison of Superconducting AC Machines for Hybrid Electric Aircraft

Machine learning applied to X-ray tomography as a new tool to analyze the voids in RRP Nb3Sn wires

Contact Info

Product

Resources

About

Bending strain tolerance of MgB₂superconducting wires

Fabrication of superconducting coils and (Ba,A)Fe₂As₂ (A:Na, K) long round wires with large superconducting cores

Fabrication of superconducting coils and (Ba,A)Fe₂As₂ (A:Na, K) long round wires with large superconducting cores