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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:1
The event and skepticism for the electrical conductor LK-99 at ambient temperature and pressure
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Article Number:Article 100059
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cited:13
Charging process simulation of a coil by a self-regulating high-Tc superconducting flux pump
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Article Number:Article 100061
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Abstract
Corresponding email:pengbo.zhou@kit.edu
Self-regulating high-temperature superconducting (HTS) flux pumps enable direct current injection into a closed-loop superconducting coil without any electrical contact. In this work, the process of charging a coil by a self-regulating HTS flux pump is examined in detail by numerical modeling. The proposed model combines an -formulation finite element method (FEM) model with an electrical circuit, enabling a comprehensive evaluation of the overall performance of self-regulating HTS flux pumps while accurately capturing local effects. The results indicate that the proposed model can capture all the critical features of a self-regulating HTS flux pump, including superconducting properties and the impact of the secondary resistance. When the numerical results are compared to the experimental data, the presented model is found to be acceptable both qualitatively and quantitatively. Based on this model, we have demonstrated how the addition of a milliohm range, normal-conducting secondary resistance in series with the charging loop can improve the charging process. In addition, its impact on the charging performance is revealed, including the maximum achievable current, charging speed, and the generated losses. The modeling approach employed in this study can be generalized to the optimization and design of various types of flux pumps, potentially expediting their practical application.
cited:5
Hope and challenge of ternary hydrogen-based superconductors under pressure
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Article Number:Article 100046
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cited:28
Concept design of an HTS linear power generator for wave energy conversion
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Article Number:Article 100043
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Abstract
Corresponding email:pkambo3@gmail.com
We show a conceptual structure for a wave energy converter, which features a direct-drive linear power generator with REBaCuO high-temperature superconducting (HTS) bulk field poles and driven by a heaving buoy. A dual translator power generation system of the proposed concept structure is a linear generator in which both the HTS bulks and armature copper coils move in opposite directions simultaneously. A performance analysis of our linear generator was conducted using a finite-element electromagnetic field analysis method. The results of the analysis were compared between the HTS dual translator linear power generator and the HTS single translator linear power generator. The maximum electromagnetic force and the average output power of the HTS dual translator are around 5 % and 11 % higher than that of the HTS single translator. We further present the results of the analysis regarding the influence of reducing the stroke length of the linear generator translator on the output power, where the output power for the HTS dual translator system increased up to a factor of two, in comparison to the HTS single translator counterpart, for the same reduction of stroke length.
cited:12
AC loss mitigation for high temperature superconducting coils in wireless power transfer
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Article Number:Article 100044
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Abstract
Corresponding email:Hongye.Zhang@manchester.ac.uk
With the rapid development of high temperature superconducting (HTS) technology, second generation (2G) HTS materials have become a promising alternative to traditional conductive materials in the power transmission industry. Recently, the topic of using HTS materials in wireless power transfer (WPT) systems for electric vehicles (EVs) has attracted widespread attention in the background of net zero transport. With virtually zero DC resistance and superior current-carrying capacity, HTS materials can achieve high quality factor and power density in the WPT resonant circuits compared to conventional metals, e.g., copper. However, the optimal working frequency for the conventional WPT system is relatively high in the order of kilohertz level. Superconducting coils working at high frequencies could generate high AC losses, reducing the overall power transfer efficiency (PTE) and increasing the cooling burden. In order to improve the PTE of HTS-WPT systems, the AC loss mitigation methods for different HTS coil topologies have been investigated in this paper by varying the inter-turn gap and tape width. Three HTS coil structures, namely the spiral coil, the solenoid coil and the double pancake (DP) coil, have been studied with a 2D axisymmetric multi-layer numerical model based on the H - formulation, and the simulation results have been validated by the published experimental data. The general loss characteristics, loss distributions in each turn, as well as magnetic flux densities have been analysed in detail for three types of HTS coils. Moreover, the impact of these two loss reduction methods on the WPT performance has also been evaluated. Findings have shown that increasing the inter-turn gap and tape width can effectively reduce the AC power losses and increase the PTE of the HTS-WPT system. The spiral coil demonstrates the highest AC power loss reduction effect and PTE while maintaining a stable level of magnetic fields. This paper is believed to deepen the understanding of superconducting WPT and provide a useful reference for more efficient wireless energisation applications.
cited:9
Design of a finite impulse response filter for rapid single-flux-quantum signal processors based on stochastic computing
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Article Number:Article 100045
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Abstract
Corresponding email:tangguangming@ict.ac.cn
Rapid-Single-Flux-Quantum (RSFQ) circuit technology is well known for its low power consumption and latency, which enables digital signal processing up to tens of GHz. As a fundamental digital filter, the Finite Impulse Response (FIR) filter has wide applications in communication systems. A design of an FIR filter based on RSFQ circuit technology is proposed. However, the FIR filter consumes large amounts of adders and multipliers. Based on Stochastic Computing (SC) theory with which adder and multiplier are much simpler, the hardware cost of FIR filter is dramatically reduced. A novel stochastic number generator (SNG), a stochastic-to-binary converter (SBC), and the FIR filter were designed and verified via logic simulation with a target frequency of 10 GHz. The results indicated the FIR filter performs correct operations. The proposed FIR filter consists of 2255 Josephson junctions (JJs) without wiring cells (i.e., Josephson Transmission Lines (JTLs), Passive Transmission Lines (PTLs)), which is acceptable, making it possible to be used in RSFQ digital signal processors.
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