IEEE Transactions on Applied Superconductivity最新文献_第8页

Numerical Simulation of High-Field Bulk Superconducting Magnet Reinforcement Using Beryllium Copper 铍铜强化高场体超导磁体的数值模拟

IF 1.8 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2026-08-01 Epub Date: 2026-03-09 DOI: 10.1109/TASC.2026.3671217

Dongkai Chen;Tayebeh Mousavi;Mark D. Ainslie

{"title":"Numerical Simulation of High-Field Bulk Superconducting Magnet Reinforcement Using Beryllium Copper","authors":"Dongkai Chen;Tayebeh Mousavi;Mark D. Ainslie","doi":"10.1109/TASC.2026.3671217","DOIUrl":"10.1109/TASC.2026.3671217","url":null,"abstract":"Trapped fields exceeding 20 T are theoretically achievable in bulk, single-grain high-temperature superconductors (HTS), making them promising candidates for high-field magnet applications. Experimentally, trapped fields above 17 T have been achieved using mechanical reinforcement such as resin impregnation with carbon-fibre wrapping or shrink-fitted stainless steel (SUS). However, because these materials have low thermal conductivity, issues such as localised heating and flux-jump instabilities remain during the magnetization process. This study investigates beryllium copper (BeCu) as an alternative reinforcement, leveraging its superior thermal conductivity and mechanical strength at cryogenic temperatures. A numerical field-cooled magnetization study was conducted using finite-element models to compare the performance of bulk HTS magnets reinforced with either SUS or BeCu rings. Results show that BeCu reinforcement provides higher compressive stress, improved thermal stability, and higher trapped field. The study is extended to simulate a previously reported experiment in which flux jumps limited the trapped field to below 20 T; under identical conditions, replacing SUS with BeCu suppresses flux jumps and maintains thermal stability. Stress analysis reveals that BeCu enables greater pre-stress due to its higher thermal expansion coefficient. Additional simulations under a 25 T applied field demonstrate that BeCu-reinforced magnets could trap over 22 T at 11 K, suggesting enhanced performance and potential for surpassing current bulk HTS magnetization records.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 5","pages":"1-5"},"PeriodicalIF":1.8,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148487909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical Simulation of a Bulk Superconductor-Based HTS Dynamo-Type Flux Pump 基于超导体的高温超导电机型磁通泵的数值模拟

IF 1.8 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2026-08-01 Epub Date: 2026-01-26 DOI: 10.1109/TASC.2026.3658283

Rui Du;Mark D. Ainslie

{"title":"Numerical Simulation of a Bulk Superconductor-Based HTS Dynamo-Type Flux Pump","authors":"Rui Du;Mark D. Ainslie","doi":"10.1109/TASC.2026.3658283","DOIUrl":"10.1109/TASC.2026.3658283","url":null,"abstract":"The high-temperature superconducting (HTS) dynamo is a promising technology for generating large DC currents in superconducting coils without thermally inefficient current leads or bulky power supplies, with potential applications in electric machines and MRI/NMR magnets. A key factor influencing the output voltage and charging performance of HTS dynamos is the magnetic field strength of the magnet(s) rotating past the HTS wire, which is limited in conventional permanent magnet-based designs. In this study, the permanent magnet in the HTS dynamo benchmark model is replaced with a bulk superconductor of similar size. A two-dimensional finite-element model is developed in COMSOL Multiphysics to evaluate the open-circuit voltage of the bulk-based dynamo under different trapped field assumptions corresponding to different bulk operating temperatures. The results show that the bulk-based HTS dynamo can generate significantly higher output voltage than conventional designs, increasing approximately linearly with the trapped field strength. These findings demonstrate the strong potential of bulk superconductors to enhance the performance and coil-charging capability of HTS dynamos.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 5","pages":"1-5"},"PeriodicalIF":1.8,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148488026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimization of YBa2Cu3Oy+BaHfO3 Thin Films Growth Conditions for in-Field Jc Performance at Low-Temperature YBa2Cu3Oy+BaHfO3薄膜生长条件对低温现场Jc性能的优化

IF 1.8 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2026-08-01 Epub Date: 2026-01-23 DOI: 10.1109/TASC.2026.3657350

Shin Okumura;Ataru Ichinose;Tomoya Horide;Yutaka Yoshida

{"title":"Optimization of YBa2Cu3Oy+BaHfO3 Thin Films Growth Conditions for in-Field Jc Performance at Low-Temperature","authors":"Shin Okumura;Ataru Ichinose;Tomoya Horide;Yutaka Yoshida","doi":"10.1109/TASC.2026.3657350","DOIUrl":"10.1109/TASC.2026.3657350","url":null,"abstract":"Optimization of fabrication parameters is essential for improving the superconducting performance of REBa2Cu3O7<italic>-δ (REBCO) coated conductors, particularly under low-temperature and high-magnetic-field conditions. In this study, we aimed to optimize the substrate temperature(<italic>Ts) and Y composition in YxBa2Cu3O7<italic>-δ + BaHfO3 (YBCO+BHO) films using pulsed laser deposition method, with the critical current density <italic>Jc at 20 K and 9 T as the objective variable. The optimization was conducted using a data-driven approach guided by an acquisition function based on Gaussian process regression (GPR). The results indicated that the maximum <italic>Jc was achieved under a Y-poor composition (Y composition = 0.9) and <italic>Ts = 870 °C. Transmission electron microscopy (TEM) revealed that Y0.9 compositions promoted film growth under higher supersaturation, leading to the formation of smaller and denser BHO nanorods. These microstructural characteristics effectively enhanced flux pinning and improved <italic>Jc under low-temperature and high magnetic fields. Microstructural analysis clarified the complex interplay between composition, growth conditions, and flux pinning behavior. These findings underscore the importance of optimizing composition and condition to tailor microstructures and improve flux pinning in REBCO nanocomposite films.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 5","pages":"1-5"},"PeriodicalIF":1.8,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148488415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Current Transfer Length and Interface Resistance of KC4 REBCO Tapes KC4 REBCO带的电流传递长度和界面电阻

IF 1.8 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2026-08-01 Epub Date: 2026-02-12 DOI: 10.1109/TASC.2026.3664051

N. Bagrets;B. Holzapfel;K. P. Weiss;C. Barth;A. Ballarino

{"title":"Current Transfer Length and Interface Resistance of KC4 REBCO Tapes","authors":"N. Bagrets;B. Holzapfel;K. P. Weiss;C. Barth;A. Ballarino","doi":"10.1109/TASC.2026.3664051","DOIUrl":"10.1109/TASC.2026.3664051","url":null,"abstract":"In recent years, high temperature superconductors (HTS) have been developed intensively for different applications. <italic>REBCO HTS tapes used for these applications are hybrid materials where the superconductor is thin layer within a multilayered Coated Conductor (CC) structure, and usually it is coated by metals, e.g., by silver, copper, or stainless steel. The interface resistance between the superconducting layer and the surrounding layers is an important characteristic of an HTS tape, along with current density and critical temperature, as it strongly influences the current transfer length (CTL) and the Normal Zone Propagation (NPZ) velocity. There exists a well-known method for the evaluation of the interface resistance between the HTS layer and the surrounding metal layer [1, 2], or metal contact embedded in HTS material [3]. The interface resistance often differs by orders of magnitude in commercially available HTS tapes [4]. The values of the interface resistance and CTL together with critical current can be affected by conditions of storage and application environment. Often the tapes are stored in atmospheric conditions with certain humidity before Ag depositing step. Nowadays, with growing interest to hydrogen applications, HTS tapes are often considered for usage in hydrogen environment. However, it is unclear how the hydrogen atmosphere or humidity are influencing tape´s performance. For the tapes produced by KC4, the KIT-CERN <italic>REBCO laboratory, the influence of air humidity on non-stabilized tapes and H2 exposure on silver stabilized tapes was investigated.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 5","pages":"1-3"},"PeriodicalIF":1.8,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148489561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microwave Surface Resistance of Tl-1223 Films in a DC Magnetic Field Tl-1223薄膜在直流磁场中的微波表面电阻

IF 1.8 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2026-08-01 Epub Date: 2026-02-09 DOI: 10.1109/TASC.2026.3662298

Alessandro Magalotti;Andrea Alimenti;Emilio Bellingeri;Cristina Bernini;Sergio Calatroni;Alessandro Leveratto;Enrico Silva;Kostiantyn Torokhtii;Ruggero Vaglio;Pablo Vidal García;Nicola Pompeo

{"title":"Microwave Surface Resistance of Tl-1223 Films in a DC Magnetic Field","authors":"Alessandro Magalotti;Andrea Alimenti;Emilio Bellingeri;Cristina Bernini;Sergio Calatroni;Alessandro Leveratto;Enrico Silva;Kostiantyn Torokhtii;Ruggero Vaglio;Pablo Vidal García;Nicola Pompeo","doi":"10.1109/TASC.2026.3662298","DOIUrl":"10.1109/TASC.2026.3662298","url":null,"abstract":"We present first preliminary surface impedance measurements on Tl-1223 films in dc magnetic fields, in view of potential applications for the next generation Future Circular Collider (FCC-hh) at CERN. The Tl-1223 samples were produced through laser ablation, with nominal thickness of <inline-formula><tex-math>$1 upmu mathrm{m}$</tex-math></inline-formula> and grown on a thick LaAlO<inline-formula><tex-math>$_{3}$</tex-math></inline-formula> substrate. The presence of Tl-1212 phase identified by XRD and BSE microscopy, could be avoided by changing the oxygen partial pressure during heat treatment. The high-frequency transport properties of the samples were characterized using microwave resonant devices, at fixed frequencies of 14.9 GHz, 24.2 GHz and 26.7 GHz, in the temperature range 40 K to 140 K. An external applied static magnetic field up to <inline-formula><tex-math>$12 ,mathrm{T}$</tex-math></inline-formula> was applied. Samples from subsequent batches exhibited huge improvements in the microwave properties, confirming the progress in the deposition technique.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 5","pages":"1-5"},"PeriodicalIF":1.8,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11381596","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148489562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flywheel Type Uninterruptible Power Supply Using High Temperature Superconducting Induction Machine and Its Self-Excitation Effect 利用高温超导感应电机的飞轮式不间断电源及其自激效应

IF 1.8 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2026-08-01 Epub Date: 2026-02-20 DOI: 10.1109/TASC.2026.3666498

Osami Tsukamoto;Kazuhito Yamagishi;Yasutaka Fujimoto;Yusuke Tkahashi

引用次数: 0

A Novel Equivalent Circuit Method for Rapid Analysis for Superconducting Motors 一种新的超导电机快速分析等效电路方法

IF 1.8 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2026-08-01 Epub Date: 2026-02-23 DOI: 10.1109/TASC.2026.3666518

Wenkai Yan;Xiaoze Pei;Yuchen Wang;John Frederick Eastham;Connor De Trafford;Xianwu Zeng

引用次数: 0

Improvement of Vacuum Thermal Insulation Properties for Ultralightweight Stacked Superconducting Cables 超轻型叠层超导电缆真空隔热性能的改进

IF 1.8 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2026-08-01 Epub Date: 2026-03-18 DOI: 10.1109/TASC.2026.3675577

K. Shiohara;M. Kakitani;M. Sato;T. Nakanishi;K. Adachi;T. Izumi;M. Iwakuma

引用次数: 0

IEEE Transactions on Applied Superconductivity Information for Authors IEEE应用超导信息汇刊

IF 1.8 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2026-08-01 Epub Date: 2026-08-24 DOI: 10.1109/TASC.2026.3719206

引用次数: 0

AC Loss Scaling of a REBCO Double-Pancake Coil Over Wide Temperature and Magnetic Field Regimes 宽温度和宽磁场条件下REBCO双煎饼线圈的交流损耗标度

IF 1.8 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2026-08-01 Epub Date: 2026-01-12 DOI: 10.1109/TASC.2026.3653352

Wenhao Li;Zhenan Jiang;Difan Zhou;Chuanbing Cai

{"title":"AC Loss Scaling of a REBCO Double-Pancake Coil Over Wide Temperature and Magnetic Field Regimes","authors":"Wenhao Li;Zhenan Jiang;Difan Zhou;Chuanbing Cai","doi":"10.1109/TASC.2026.3653352","DOIUrl":"10.1109/TASC.2026.3653352","url":null,"abstract":"AC loss is a critical consideration in the design of high temperature superconducting (HTS) magnets. REBCO coils exhibit excellent current-carrying capabilities and are popular choices for applications such as fusion magnets and superconducting magnetic energy storage. However, there is currently a lack of research on the AC loss of REBCO coils under low temperature and high field conditions. A quantitative understanding of AC loss over wide temperature and magnetic field ranges is urgently needed. This paper investigates the dynamic resistance, magnetization loss, and total loss of a small double-pancake coil (DPC) based on a 2D axisymmetric <italic>H-formulation, at temperatures of 25 K, 50 K, and 77 K in perpendicular AC magnetic fields up to 5 T. The results show that at different temperatures, the dynamic resistance, total loss, and loss components of the DPC can all be scaled by its critical current, <inline-formula><tex-math>${{I}_{{rm{c, coil}}}}$</tex-math></inline-formula>. This implies that results from the high-temperature, low-field regime can be used to predict the loss values in the low-temperature, high-field regime. In addition, these scaling behaviors are quantitatively explained by the extended equations. This study is expected to provide a valuable reference for the estimation of losses in high-field magnets.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 5","pages":"1-6"},"PeriodicalIF":1.8,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146026357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0