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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:19
Commercial compact fusion triggered REBCO tape industry: Pulsed laser deposition technology opportunities and challenges
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Article Number:Article 100188
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Abstract
Corresponding email:yuezhao@sjtu.edu.cn
The rapid rise of commercial compact fusion devices has triggered fast-growing demand for high-temperature superconducting tapes, creating a major opportunity for the high-temperature superconducting (HTS) tape industry. Pulsed laser deposition (PLD) has been extensively applied for fabrication of heteroepitaxial HTS wires or tapes based on REBCO-type superconductor, also referred to as, coated conductors (CCs). A combination of multi-plume, multi-turn deposition technique and use of high-power excimer lasers has enabled and accelerated the industrialization of REBCO coated conductors. Currently, the annual production of top-tier PLD-based, HTS-wire manufacturers exceeds 3,000 km-12 mm, contributing to over half of the total global HTS wire production. PLD-REBCO tapes have demonstrated excellent in-field performance ( > 200 A-4 mm @20K, 20T, B//c) and competitive pricing ($20/m). PLD technology continues to evolve, demonstrating strong competitive advantages. However, challenges remain in further cost reduction, process stability, and increasing efficiency of raw material utilization. AI-based data mining and tackling emerging fundamental issues are seen as potential solutions to further improve stability and performance.
cited:11
High temperature superconductor coated conductors: A highly complex system where the only way is ‘ups’
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Article Number:Article 100189
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cited:11
High performance multifactorial designs based on a refined analytical method for HTS maglev systems
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Article Number:Article 100190
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Abstract
Corresponding email:deng@swjtu.cn
YBaCuO high-temperature superconductors (HTS) exhibit remarkable passive levitation over permanent magnet guideways (PMG), but the strong nonlinearity poses significant challenges for developing analytical models for HTS maglev systems. This paper presents a refined analytical method for calculating the electromagnetic force in such systems. The method incorporates critical factors, including the complex properties of the superconductors, the Halbach PMG geometry, and various operation conditions. The derived analytical expressions explicitly reveal the interplay between system parameters and levitation performance. Experimental and numerical validation confirms the model’s high prediction accuracy in magnetic fields, levitation and guidance forces. A sensitivity analysis further identifies the most influential parameters such as thickness of the magnet, levitation height, Halbach wavelength. Moreover, this paper calculates and provides the recommended structural parameters for both rare-earth and rare-earth-free PMG. The potential of HTS maglev systems for heavy-haul applications is explored, demonstrating the capability to achieve significant levitation force (about 50 ton/m) under constrained geometric conditions. This work provides critical insights for minimizing permanent magnet consumption in HTS maglev systems and circumventing rare-earth material constraints.
cited:12
A low-resistance joint of REBCO stacked cable for large-scale superconducting magnets
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Article Number:Article 100191
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Abstract
Corresponding email:songp@mail.tsinghua.edu.cn；tmqu@mail.tsinghua.edu.cn
The integration of REBCO superconducting coils into compact tokamak toroidal field magnets represents a transformative advancement in fusion technology. In the fabrication of these magnets, electrical connections between pancake coils are typically established through a transverse bridging joint, the performance of which critically impacts device efficiency. To address the demand for enhanced connectivity, this study presents a novel bridge-type “stacked joint” utilizing a superconducting-copper composite structure, optimized for inter-coil connections of stacked REBCO cables. Leveraging a modular stacking approach and low-temperature soldering, this design achieves a resistance as low as 1 over a 10 cm length alongside a soldering resistivity below 25 in a liquid nitrogen (77 K) self-field environment. The study further investigates the impact of tape length and quantity on joint electrical performance under this configuration. Rigorous testing, including 10 thermal cycles (77 K to room temperature) and pressure loads up to 30 MPa, confirms the joint’s structural reliability and the consistency of the fabrication process, underscoring its potential for fusion applications.
cited:4
Analytical model for coupling loss in filamentized high-temperature superconducting tapes
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Article Number:Article 100193
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Abstract
Corresponding email:elekgomo@savba.sk
Composite wires containing superconducting filaments embedded in a metallic matrix are used in various applications. In the presence of time-varying magnetic fields, electrical currents are induced in the loops where superconductor and normal metal regions are connected in series, causing energy dissipation known as coupling loss. Commonly accepted analytical formulas provide a basic understanding of this phenomenon. Recently, tape-shaped conductors containing a single layer of high-temperature superconductor striated in several parallel filaments have gained attention for use in nuclear fusion reactors, particle accelerators, and motors. It was found that, in spite of a dissimilar geometry, the analytical formulas deduced for round composites provide a fair qualitative interpretation of the experimental data obtained for this new kind of conductor. However, because of the used postulation of uniform local magnetic field, these models cannot correctly predict the dissipation near the peak in frequency dependence. We derived an analytical model starting from the assumption of an exponential decrease of magnetic field from the tape ends towards its center. This model is free of fitting parameters, with the peak dissipation controlled by the tape width only. Compared to previous models, it predicts 40% lower peak loss. We demonstrate its decent agreement with experiments.
cited:9
Superconducting magnets for high power microwave systems: Performance enhancement and future prospects
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Article Number:Article 100194
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