Article
Physics, Applied
James H. P. Rice, Ross W. Taylor, Dominic A. Moseley, Alexander Petrov, Heng Zhang, Steven Wray, Jianzhao Geng, Rodney A. Badcock
Summary: Iron-core electromagnets are commonly used as applied-field switches in high-temperature superconducting (HTS) flux pumps. However, recent reports have shown a decrease in the critical current (Ic), which is attributed to the asymmetric interaction between the self-induced magnetic field of the HTS switch element and the magnetic circuit of the iron-core electromagnet.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Hanxin Ye, Wei Wang, Yuntian Zhang, Hong Li, Jiafu Wei, Hang Xu, Qun Zhou, Xueshan Liu, Yong Lei
Summary: This paper presents the fabrication and performance of a linear-motor type flux pump with a pumped current larger than 640 A, which is suitable for MRI magnets and HTS electric machines. The tested results show that this high-temperature superconducting flux pump can output direct current larger than 640 A at 77 K, with advantages such as smaller size and elimination of heat leakage compared to traditional power supplies. Increasing the length of the travelling wave region of this flux pump can potentially reach kilo-ampere level current output. The purpose of this paper is to test the reliability of the methodology for the large current HTS flux pump.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Physics, Multidisciplinary
Moe M. Aye, Elmeri Rivasto, Mukarram Z. Khan, H. Rijckaert, H. Palonen, H. Huhtinen, Isabel Van Driessche, P. Paturi
Summary: The use of 50nm thick layers in multilayer structures increases J(c) by up to 40% compared to single layer BZO-doped films, with the best performance observed at high magnetic fields and temperatures, making them attractive for various electrical power applications in the future.
NEW JOURNAL OF PHYSICS
(2021)
Article
Physics, Applied
P. Paturi, H. Huhtinen
Summary: We present a method to achieve the maximum critical current density, J(c), for YBa2Cu3O6+x (YBCO) thin films. By optimizing both the mean free path and the flux pinning structure, the maximum values can be reached.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Hong Li, Wei Wang, Xiaojun Niu, Jun Zheng, Yunfei Gao, Hanxin Ye, Yuntian Zhang, Jiafu Wei, Hang Xu, Boyang Shen, Qun Zhou, Xueshan Liu, Yong Lei
Summary: This paper presents the preliminary charging test results of an HTS no-insulated double racetrack coil with the linear-motor type flux pump for a 16.9-kW-class HTS synchronous motor, where the CSED was optimized by testing different wavelengths of flux pumps and superconducting stator wires.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Materials Science, Multidisciplinary
Daxing Huang, Hongjing Shang, Taiguang Li, Bowei Xie, Qi Zou, Hongwei Gu, Zhifeng Ren, Fazhu Ding
Summary: This study presents a novel method to fabricate a superconducting joining between YBCO coated conductors with large current capacities, achieving more than 90% retention of critical current. The use of an Ag layer in the joining strap promotes the recovery of superconductivity during oxygenation annealing, resulting in superior superconducting performance through optimized atomic alignment at the joined YBCO interface.
MATERIALS TODAY PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Daniel S. Nickel, Walter H. Fietz, Klaus-Peter Weiss, Michael J. Wolf
Summary: The critical current modeling results of HTS CroCos at different bending radii are discussed and validated by experiments, showing that mechanical strain and degradation of critical current can be induced at different bending radii.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Physics, Applied
Guanjie Liu, Guomin Zhang, Guole Liu, Haonan Wang, Liwei Jing
Summary: This paper investigates the effect of substrate magnetism on the local critical current of YBCO coils and proposes a new numerical model for critical current. The results show that coils wound with magnetic substrate have higher magnetic flux density on the surface but lower flux density inside, and the critical current per turn is more uniformly distributed.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2022)
Article
Engineering, Electrical & Electronic
Y. Tsuchiya, I. Sakai, K. Mizuno, Y. Kohama, Y. Yoshida, S. Awaji
Summary: High-temperature superconducting (HTS) tapes have been extensively researched for various applications, including high-temperature cooling, ultra-high field magnets, fusion reactors, and rotating machines. Improvements in the critical current of HTS tapes have led to the development of test facilities with variable temperatures and high currents. This study focuses on pulsed current measurements to determine the critical currents of commercially available HTS tapes at high currents and limited spaces, using a low inductance probe and a 500 A-class pulse power supply.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Physics, Applied
Moe Moe Aye, Elmeri Rivasto, Hannes Rijckaert, Heikki Palonen, Hannu Huhtinen, Isabel Van Driessche, Petriina Paturi
Summary: Experimental study on the effect of BaZrO3 (BZO) nanorod density within the YBa2Cu3O6+x (YBCO) lattice reveals that the maximum flux pinning can be achieved by controlling the BZO content. The best pinning performance is observed at a BZO concentration of 10%, where the distance between nanorod edges is approximately equal to the nanorod diameter.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Jospeh Forman, Shozo Yoshizumi, Han Cai, Jay LeFebvre, Yan-Ting Wang, Tofik Mamedov, Stefano Spagna, Shane Cybart
Summary: In this article, we present the fabrication and electrical characterization of high-transition temperature SQUIDs using helium ion beam irradiation. The SQUID device consists of a direct coupled flux focusing pickup loop with a diameter of 300 μm. We observe a voltage modulation with a peak-to-peak amplitude of 500 μV and a periodicity of 275 nT per flux quantum when the SQUID is biased above the critical current. The SQUID chip is mounted on a temperature-controlled system equipped with optically aligned piezo scanners for accurate sample positioning within 100 μm from the sensor. The system serves as a magnetic properties characterization tool and can operate over a wide temperature range (1-50 K) without the need for thermal isolation of the SQUID from the sample.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Chemistry, Analytical
Sara Pettinato, Marco Girolami, Maria Cristina Rossi, Stefano Salvatori
Summary: This paper describes a compact electronic system that uses a synchronous demodulation measurement method to acquire pulsed-current signals. The system demonstrates superior performance in terms of signal-to-noise ratio compared to conventional instruments, and has a reading error of about 0.1% regardless of the signal duty cycle.
Article
Engineering, Electrical & Electronic
B. Liang, Y. Chen, J. Jiang, X. S. Yang, M. Xu, Y. Zhao
Summary: A novel QIS-CICC conductor was proposed in this paper based on existing quasi-isotropic strand (QIS) conductor and twisted stacked tape cable-cable in conduit conductor (TSTC-CICC). Numerical modeling and analysis of critical current anisotropy showed that while the QIS-CICC had lower critical currents under self-field conditions compared to the TSTC-CICC, it exhibited significantly less current decay under a 1 T external field, with both conductors having similar anisotropies.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Physics, Condensed Matter
A. N. Moroz, V. A. Kashurnikov, I. A. Rudnev, A. N. Maksimova
Summary: The study explores the impact of magnetic field pulses on a vortex system in a high-temperature superconductor using the Monte Carlo method. Different shapes and amplitudes of pulses affect the efficiency of flux trapping, with the type of pinning distribution playing a significant role. Saturation dependencies of trapped magnetic flux density on pulse amplitude are achieved.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Engineering, Electrical & Electronic
Shaon Barua, Daniel S. Davis, Yavuz Oz, Jianyi Jiang, Eric E. Hellstrom, Ulf P. Trociewitz, David C. Larbalestier
Summary: In summary, Bi2Sr2CaCu2O8+x (Bi-2212) is currently the only high-temperature superconductor capable of achieving a high critical current density under high magnetic fields. Recent improvements in Bi-2212 round wires have been attributed to optimization of the heat treatment process and a transition to a finer and more uniform powder. The distribution of critical current in Bi-2212 wires is compared to other materials like Nb-Ti, showing that the spread of critical current in Bi-2212 wires is about twice the relative standard of high-J(c) Nb-Ti well below H-irr. There is no obvious contribution of Bi-2212 anisotropy to the critical current distribution.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Engineering, Electrical & Electronic
Bruno de Sousa Alves, Marc Laforest, Frederic Sirois
Summary: This article presents a new 3-D thin-shell model for electromagnetic modeling of arbitrary HTS tape configurations. The model can accurately calculate nonuniform current distributions and losses, while reducing computational burden.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Engineering, Electrical & Electronic
P. Tixador, A. Akbar, M. Bauer, M. Bocchi, A. Calleja, C. Creusot, G. Deutscher, F. Gomory, M. Noe, X. Obradors, M. Pekarcikova, F. Sirois
Summary: The EU FASTGRID project aimed to improve the REBCO conductor for the Superconducting Fault Current Limiter (SFCL) by investigating two approaches: reducing tape length and improving tape cost and performance. Several new conductors and technologies have been developed and successfully tested, showing promising results for enhancing the economical attractiveness of SFCL.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Review
Physics, Applied
Felix Huber, Wenjuan Song, Min Zhang, Francesco Grilli
Summary: This article presents a review of the application of the T-A formulation for modeling the electromagnetic behavior of high-temperature superconductor tapes. It provides a detailed description of the governing equations in different cases and discusses the implementation of the T-A formulation in various applications. The advantages and disadvantages of this approach are also discussed.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
N. Riva, A. Halbach, M. Lyly, C. Messe, J. Ruuskanen, V. Lahtinen
Summary: The traditional H formulation for modeling superconductors becomes infeasible for large and complex systems due to the large number of degrees of freedom. In contrast, the H-Φ formulation reduces the degrees of freedom and computation time significantly. This study demonstrates the accuracy and efficiency of the H-Φ formulation in 2D and 3D magnetothermal analysis, and compares the results with COMSOL.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Physics, Applied
Carlos Roberto Vargas-Llanos, Joachim Kraemer, Mathias Noe, Francesco Grilli
Summary: This work presents the design and construction of a setup for measuring transport AC losses in high-temperature superconducting coils using a calorimetric approach. A 3D printed bubble collector is used to collect the evaporated cryogen, which is then guided into a flow sensor to measure the dissipation of energy. The results, analyzed statistically, show that the measurements are stable with average values and uncertainty ranges. Furthermore, the AC transport losses in a racetrack coil for an electrical machine application are measured and compared with 3D simulation results based on the homogenization of the T-A formulation.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Review
Physics, Applied
Mohammad Yazdani-Asrami, Wenjuan Song, Antonio Morandi, Giovanni De Carne, Joao Murta-Pina, Anabela Pronto, Roberto Oliveira, Francesco Grilli, Enric Pardo, Michael Parizh, Boyang Shen, Tim Coombs, Tiina Salmi, Di Wu, Eric Coatanea, Dominic A. Moseley, Rodney A. Badcock, Mengjie Zhang, Vittorio Marinozzi, Nhan Tran, Maciej Wielgosz, Andrzej Skoczen, Dimitrios Tzelepis, Sakis Meliopoulos, Nuno Vilhena, Guilherme Sotelo, Zhenan Jiang, Veit Grosse, Tommaso Bagni, Diego Mauro, Carmine Senatore, Alexey Mankevich, Vadim Amelichev, Sergey Samoilenkov, Tiem Leong Yoon, Yao Wang, Renato P. Camata, Cheng-Chien Chen, Ana Maria Madureira, Ajith Abraham
Summary: This paper presents a roadmap for applying AI techniques and big data (BD) in various aspects of superconducting applications, such as modelling, design, monitoring, manufacturing, and operation. Short articles are provided to outline potential applications and solutions, aiming to assist researchers, engineers, and manufacturers in understanding the feasibility of using AI and BD techniques to tackle challenges in superconductivity. These potential futuristic routes and their related materials/technologies are considered for a time frame of 10-20 years.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Alexandre Arsenault, Bruno de Sousa Alves, Gregory Giard, Frederic Sirois
Summary: The growing interest in fast and accurate simulation methods of the electromagnetic behavior of high-temperature superconducting materials has led to significant developments in recent years. The H-f) formulation has gained traction as a way to speed up simulations, but high-order shape functions were previously needed for sufficient accuracy. In this article, a magnetodynamic H-f) formulation is implemented using Faraday's law in air domains, leading to better convergence, more accurate solutions, and a slight speed advantage compared to the previously used H-f) formulation.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Engineering, Electrical & Electronic
Alexandre Arsenault, Frederic Sirois
Summary: The current methods for magnetic drug delivery face challenges in generating adequate forces in deep tissues. This study compares two different methods of generating magnetic forces using high-temperature superconducting (HTS) bulks through finite element method simulations. The results show that the forces generated by HTS bulks are either complementary to or stronger than those generated by ferromagnetic (FM) cores. Therefore, HTS bulks have the potential to navigate magnetic particles more efficiently in the deep tissues of the human vascular network.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Engineering, Electrical & Electronic
Jeseok Bang, Andrea Musso, Nicolo Riva, Jung Tae Lee, Geonyoung Kim, Wonseok Jang, Seungyong Hahn
Summary: This paper presents experimental and numerical analysis of a no-insulation high-temperature superconductor coil to study the temperature-dependent electric contact resistivity. A test coil was designed, constructed, and operated, and its electromagnetic properties were evaluated in liquid nitrogen. The contact resistance of the coil was evaluated from 10K to 80K at different ramp rates of charge/discharge. The experimental results were analyzed using equivalent circuit and finite element models, indicating an increase in contact resistivity with temperature and varying resistivity within different sections of the coil.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Instruments & Instrumentation
A. Arsenault, B. Charpentier-Pepin, A. Forcier, N. Nassiri, J. Bellemare, C. Lacroix, D. Menard, F. Sirois, F. Bernier, J. -m. Lamarre
Summary: This article presents a vibrating coil magnetometer designed to measure the field dependence of the critical current density of centimeter-sized bulk superconductors, providing a non-destructive alternative to traditional methods. The magnetometer is also capable of measuring the magnetic moment in applied fields up to 5 T for various magnetic materials. The magnetometer was optimized and calibrated using finite element simulations and commercial vibrating sample magnetometers, and its performance was verified through hysteresis measurements of different materials.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Physics, Applied
N. Riva, R. S. Granetz, R. Vieira, A. Hubbard, A. T. Pfeiffer, P. Harris, C. Chamberlain, Z. S. Hartwig, A. Watterson, D. Anderson, R. Volberg
Summary: High-temperature superconducting magnets are required to operate fusion devices at high fields. A project funded by ARPA-E aims to design and fabricate the first non-planar high-temperature superconductor (HTS) rare-earth barium copper oxide (REBCO) coil for a high-field stellarator. Numerical analysis and testing in liquid nitrogen showed promising results, meeting the expected goals of the project.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Review
Physics, Applied
Calvin C. T. Chow, Francesco Grilli, K. T. Chau
Summary: This paper verifies the applicability of the integral method in situations where the external magnetic field is spatially non-uniform and applies it to calculate the ac loss in superconducting tapes.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Physics, Applied
Christian Messe, Nicolo Riva, Sofia Viarengo, Gregory Giard, Frederic Sirois
Summary: This paper highlights the importance of predicting the performance and reliability of HTS cables and magnets using novel mixed finite element formulations. It introduces the BELFEM code structure and validates its implementation against benchmark simulations. The paper also outlines future plans for developing more advanced modeling capabilities.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Christian Lacroix, Kaan Oguz, John Michael David Coey, David Menard
Summary: The substitution of iron atoms by chromium in CoFeB films has been proposed to reduce the critical current density J(c) for current-driven magnetization switching in spin transfer torque devices by reducing its magnetization. The effect of Cr on the magnetic damping has remained elusive. Ferromagnetic resonance (FMR) measurements were used to study the different mechanisms of FMR damping in Co40Fe40-xCrxB20 thin films. The results showed that the addition of Cr increases the spin-orbit damping but reduces the magnetic relaxation rate.
Article
Engineering, Manufacturing
Jean Langot, Etienne Gourcerol, Anamaria Serbescu, David Brassard, Kambiz Chizari, Maxime Lapalme, Alexandra Desautels, Frederic Sirois, Daniel Therriault
Summary: This study investigates the performance of non-woven nickel-coated carbon fibers with varying sheet resistivity as potential solutions for lightning strike protection of composite aircraft. The results show that nickel-coated carbon fibers are lighter than expanded copper foil and provide 100% retention of flexural strength after lightning strike.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
