IEEE Transactions on Applied Superconductivity最新文献

{"title":"Efficient Two-Step PFM Process Employing Novel Crossed Fields Combination","authors":"Haoran Jiang;Tianxin Lan;Wenhao Li;Ya Shi;Dongxu Wang;Chuanbing Cai;Difan Zhou","doi":"10.1109/TASC.2025.3596783","DOIUrl":"https://doi.org/10.1109/TASC.2025.3596783","url":null,"abstract":"A reliable in-situ magnetization technique is crucial for exploiting the remarkable magnetic flux trapping capability of bulk superconductors in practical applications, such as nuclear magnetic resonance, MRI, superconducting rotating machines, and superconducting undulators. It has been reported that the magnetization efficiency of bulk superconductors can be improved by exploiting flux jump. We propose a novel magnetization method named crossed pulsed fields magnetization, combining a transverse pulsed field magnetization (PFM) followed by a perpendicular PFM. The experimental results suggest that transverse premagnetization can reduce the perpendicular pulsed field required for magnetization by exceeding 1.2 T and increase the magnetization efficiency by approximately 9.5% both at 50 and 30 K, which is of great significance to the practical applications of single-grain YBaCuO (YBCO) bulk superconductors in electromagnetic devices.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 7","pages":"1-7"},"PeriodicalIF":1.8,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144909331","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}

{"title":"Damage Limits of $text{Nb-Ti}$ and $text{Nb}_{3}text{Sn}$ Superconductors Due to High-Intensity Beam Impact","authors":"David Gancarcik;Axel Bernhard;Marco Bonura;Cédric Hernalsteens;Anke-Susanne Müller;Jonathan Schubert;Carmine Senatore;Andreas Will;Daniel Wollmann","doi":"10.1109/TASC.2025.3596324","DOIUrl":"https://doi.org/10.1109/TASC.2025.3596324","url":null,"abstract":"High-energy hadron colliders with multi-TeV centre-of-mass energies require high-field superconducting magnets. Examples include the large hadron collider (LHC) and its high-luminosity upgrade (HL-LHC), as well as future projects such as the future circular collider (FCC-hh) and super proton–proton collider (SPPC). During operation, these magnets are exposed to primary and secondary particles from beam losses. Steady-state losses cause long-term radiation ageing, while sudden equipment failures can deposit large energy in magnet components. Understanding critical current degradation in superconductors under such conditions is essential for magnet design, development, and defining machine protection limits. Experiments were conducted at CERN’s HiRadMat facility, where 440 GeV/c high-intensity proton beams were directly impacted on <inline-formula><tex-math>$text{Nb-Ti}$</tex-math></inline-formula> and <inline-formula><tex-math>$text{Nb}_{3}text{Sn}$</tex-math></inline-formula> superconductors at < 5.5 K. Short strand samples were tested first, followed by racetrack coil assemblies. Superconducting performance was assessed via critical transport current and critical field, complemented by optical and electron microscopy. Degradation was correlated with deposited energy density, peak temperature, temperature gradient, and mechanical strain. For the first time, damage limits in thermo-mechanical terms are presented. <inline-formula><tex-math>$text{Nb-Ti}$</tex-math></inline-formula> strands and coils showed no degradation up to 1092 K. A reversible “memory loss” in <inline-formula><tex-math>$text{Nb-Ti}$</tex-math></inline-formula> coils above 335 K was linked to strand movement. <inline-formula><tex-math>$text{Nb}_{3}text{Sn}$</tex-math></inline-formula> strands exhibited up to 88% critical current loss for transverse temperature gradients of 196 K/mm or residual plastic strain > 0.42%. In <inline-formula><tex-math>$text{Nb}_{3}text{Sn}$</tex-math></inline-formula> coils, memory loss occurred above 209 K, with no permanent degradation up to 695 K and 0.42% strain.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 7","pages":"1-15"},"PeriodicalIF":1.8,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144909299","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}

{"title":"Structural Design and Analysis of 14 T Animal MRI Superconducting Magnet","authors":"Leping Wu;Zhan Zhang;Peng Gao;Chao Zhou","doi":"10.1109/TASC.2025.3595642","DOIUrl":"https://doi.org/10.1109/TASC.2025.3595642","url":null,"abstract":"High field magnetic resonance imaging (HF-MRI) systems can achieve higher image resolution and sensitivity, resulting in better image quality and more biological information, which has significant value in life science and clinical medicine applications. The development of HF-MRI system depends on the development of high field superconducting magnet. HF-MRI superconducting magnet needs to solve problems such as high magnetic field uniformity requirements, large stray field range, high coil electromagnetic stress, and shrinkage stress in low-temperature systems. This article introduces the design and optimization process of 14 T at 175 mm warm bore size animal MRI superconducting magnet. We used a nonlinear multiobjective programming algorithm to simultaneously optimize warm bore space (diameter 175 mm), magnetic field homogeneity and the stray magnetic field (5 Gauss line) for a 14 T MRI magnet. The spatial position, electromagnetic density, and electromagnetic stress of different coils are obtained, and the design stability of magnet coil is evaluated using coil loading ratio and current safety margin. In addition, the magnet coil former is designed, and the finite element method is used to perform mechanical simulation analysis on the coil former. The optimization results show that the warm bore of the magnet is 175 mm, and the homogeneity of the magnet design is 1.1 ppm at 60 mm DSV, magnet stray field (5 Gauss line) is 2.9 m in the axial direction, and 2.4 m in the radial direction from the center of the magnetic field. The minimum safety margin of the magnet coil is 10.6%, and the maximum hoop stress of the magnet coil is 225 MPa. The magnet meets the design requirements and provides necessary reference for the engineering prototype of the 14 T animal MRI superconducting magnet.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 7","pages":"1-8"},"PeriodicalIF":1.8,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144909300","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}

{"title":"Investigation of AC Losses in the HTS Twisted Stacked-Tape Conductor Cable Using H and T-A Formulation-Based Finite Element Methods","authors":"J. Z. Yan;W. J. Yang;M. L. Bai;P. Zhao;J.T. Hu","doi":"10.1109/TASC.2025.3595154","DOIUrl":"https://doi.org/10.1109/TASC.2025.3595154","url":null,"abstract":"High-temperature superconducting (HTS) twisted stacked-tape conductor-cable in conduit conductors (TSTC-CICC) are critical in superconducting fusion research. The quantification of ac losses in HTS TSTC-CICC is crucial for determining the thermal load and operational stability. However, due to the multilayer stacking characteristics and complex 3-D twisted structures of HTS TSTC-CICC, the process of analyzing the electromagnetic properties and ac losses through numerical methods is time-consuming. To addresses the need for rapid assessment of AC losses in HTS TSTC-CICC cables, this article compares different types of numerical formulations, acceleration strategies, and geometric dimensions on the time and accuracy of ac loss in HTS TSTC-CICC cables. The principles behind the errors among different models are explored based on flux distribution and current distribution characteristics. The results show that when the twist pitch of HTS TSTC-CICC cables is greater than 200 mm, the 2-D numerical model based on the <italic>T-A</i> formulation and multiscale acceleration strategies can achieve a good balance between computational time and accuracy. The error between simulation results and experimental data is between 4.3% and 6.2%, which meets the error requirements for evaluation of ac losses. This article provides a technical reference for the rapid evaluation of ac losses in HTS TSTC-CICC cables.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 7","pages":"1-9"},"PeriodicalIF":1.8,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144880477","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}

{"title":"Prototyping and Test of the “Canis” HTS Planar Coil Array for Stellarator Field Shaping","authors":"Daniel Nash;Andy D. Cate;Brian Chen;Matthew Dickerson;David A. Gates;William Harris;Udyaaksh Khera;Milo Korman;Jamal Olatunji;Misha Slepchenkov;Santhosh Srinivasan;Charles P.S. Swanson;Alex van Riel;William S. Walsh;Ryan H. Wu","doi":"10.1109/TASC.2025.3594533","DOIUrl":"https://doi.org/10.1109/TASC.2025.3594533","url":null,"abstract":"Thea Energy, Inc. is currently developing the “Eos” planar coil stellarator, the company’s first integrated fusion system capable of forming optimized stellarator magnetic fields without complex and costly modular coils. To demonstrate the field shaping capability required to enable Eos, Thea Energy designed, constructed, and tested the “Canis” 3 × 3 array of high-temperature superconductor (HTS) planar shaping coils after successfully demonstrating a single shaping coil prototype. Through the Canis 3 × 3 magnet array program, Thea Energy manufactured nine HTS shaping coils and developed the cryogenic test and measurement infrastructure necessary to validate the array’s performance. Thea Energy operated the array at 20 K, generating several stellarator-relevant magnetic field shapes and demonstrating closed-loop field control of the superconducting magnets to within 1% of predicted field, a margin of error acceptable for operation of an integrated stellarator. The Canis magnet array test campaign provides a proof of concept for HTS planar shaping coils as a viable approach to confining stellarator plasmas.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 7","pages":"1-14"},"PeriodicalIF":1.8,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11105783","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144868346","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}

{"title":"Conference Author Index","authors":"","doi":"10.1109/TASC.2025.3559815","DOIUrl":"https://doi.org/10.1109/TASC.2025.3559815","url":null,"abstract":"","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"7-9"},"PeriodicalIF":1.8,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11106301","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144750915","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}

{"title":"IEEE Transactions on Applied Superconductivity Subject Categories for Article Numbering Information","authors":"","doi":"10.1109/TASC.2025.3559817","DOIUrl":"https://doi.org/10.1109/TASC.2025.3559817","url":null,"abstract":"","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"C3-C3"},"PeriodicalIF":1.8,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11106295","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144750922","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}

{"title":"IEEE Transactions on Applied Superconductivity Information for Authors","authors":"","doi":"10.1109/TASC.2025.3586167","DOIUrl":"https://doi.org/10.1109/TASC.2025.3586167","url":null,"abstract":"","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"C4-C4"},"PeriodicalIF":1.8,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11106305","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144750939","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}

{"title":"Upcoming Special Conference Issues","authors":"","doi":"10.1109/TASC.2025.3593173","DOIUrl":"https://doi.org/10.1109/TASC.2025.3593173","url":null,"abstract":"","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"24-24"},"PeriodicalIF":1.8,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11106309","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144750960","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}

{"title":"IEEE Transactions on Applied Superconductivity Information for Authors","authors":"","doi":"10.1109/TASC.2025.3559819","DOIUrl":"https://doi.org/10.1109/TASC.2025.3559819","url":null,"abstract":"","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"C4-C4"},"PeriodicalIF":1.8,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11106302","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144750914","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}