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ISSN: 2772-8307
Copyright © 2026 Shanghai Jiaotong University. Published by Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
cited:31
Mechanical characterization of a 10-MJ HTS SMES magnet wound by quasi-isotropic strands and directly stacked tape conductors
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Article Number:Article 100042
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Abstract
Corresponding email:yswang@ncepu.edu.cn
A 10-MJ-class superconducting magnetic energy storage (SMES) magnet is designed and optimized in this study using quasi-isotropic strands and stacked-tape conductors. In order to ensure the stable operation of SMES systems, it is necessary to evaluate the mechanical properties risk caused by the Lorentz force. Therefore, in this study, the magnetic stress caused by the Lorentz force is analyzed using the finite element method. The results show that the tapes near the inner diameter of the magnet are subjected to a higher stress and require considerable support. Although the maximum stress is increased by two times due to the presence of the screening current, it is within the safety range. The screening current does not vanish after the discharge process. After discharge, the coil is still subjected to a stress on the other of a few MPa.
cited:4
Erratum to “Preparation of Bi-2212/YBCO heterostructure and their interfacial characters” [Superconductivity 4 (2022) 100030]
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Article Number:Article 100035
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cited:14
Onset temperature of intrinsic pinning in a REBCO coated conductor from critical current anisotropy
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Article Number:Article 100025
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Abstract
Corresponding email:nick.strickland@vuw.ac.nz
The field-angle dependence of the critical current in a REBa2Cu3O7 coated conductor has been measured over a fine range of temperatures from 15 K to 80 K. The particular sample is demonstrated to have a very low fraction of extrinsic planar defects by its near-isotropic critical current at 77 K. At a representative magnetic field of 3 T we are able to track the emergence of the ab-plane peak usually associated with intrinsic pinning and quantify its evolution with temperature by fitting to a maximum-entropy function. We are also able to observe the evolution of dip and peak features in the angle dependence of the power-law index n with decreasing temperature and show that a dip appearing at 65 K is supplanted by a sharper positive peak from 50 K. The combination of critical current and power-law index temperature dependences shows the onset of intrinsic pinning at 50 K.
cited:4
Preparation of Bi-2212/YBCO heterostructure and their interfacial characters
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Article Number:Article 100030
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Abstract
Corresponding email:leili@xaut.edu.cn; zhaogy@xaut.edu.cn
YBa2Cu3O7-x (YBCO) thin films were prepared on LaAlO3 (LAO) substrates by a sol–gel method, and the epitaxial growth of Bi-2212 thin films on YBCO thin films was investigated. Both YBCO and Bi2Sr2Ca1Cu2O8+δ (Bi-2212) bilayer films exhibit good biaxial texture and superconducting properties. Afterward, a cross-shaped Bi-2212/YBCO heterostructure was fabricated, and its interfacial atomic arrangement and I-V characteristics were analyzed. Atomic-resolution STEM images obtained from a spherical-aberration-corrected transmission electron microscope show that two superconducting films exhibit a layered structure and the atoms inside the films are artfully arranged. Moreover, the order of the seven atomic layers between Bi-2212 and YBCO layers with a thickness of about 1.32 nm is misarranged. Among them, the Y-O layer of YBCO and the Sr-O layer of Bi-2212 share a CuO2 layer. The I-V curves of Bi-2212/YBCO bilayer films show that the seven misarranged atomic layers at Bi-2212/YBCO interface acts as a barrier layer, which means that a Josephson junction can be fabricated using this interface characters.
cited:11
Mechanical strain triggering flux jumps of multi-filamentary Nb3Sn wires
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Article Number:Article 100031
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Abstract
Corresponding email:xuecun@nwpu.edu.cn; zhouyh@lzu.edu.cn
The composite multi-filamentary Nb3Sn wire with a high critical current density is a preferred option for fabricating the superconducting magnet beyond the limit of NbTi wire (9–16 T). However, one crucial issue stems from the fact that electromagnetic force in superconducting coils is very strong, and the critical physical properties of Nb3Sn, such as Jc, are more sensitive to mechanical strain than those of other possible low-temperature superconductors. We theoretically investigated the impact of mechanical strain on the thermomagnetic instabilities such as the flux jump (FJ) and quenching of Nb3Sn wire exposed to a static magnetic field and transport current. The good agreements with H formulation or H-φ formulation implemented on COMSOL software confirm the validity of our numerical simulations using home-made codes. It is discovered that mechanical strain can trigger flux jumps even in a static magnetic field. Furthermore, the threshold value of mechanical strain to trigger the first flux jump is a monotonic function of the static magnetic field in the case of high transport currents, while it is a non-monotonic function in the case of low transport currents. It is attributed to the fact that flux can be released by the mechanical strain, causing smooth flux penetration before triggering the flux jump. We also present the stable/unstable regions by applying mechanical strain by varying transport current, magnetic field, and working temperature, which helps in avoiding thermomagnetic instabilities while designing the superconducting magnet.
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