IEEE Transactions on Applied Superconductivity最新文献

{"title":"Thermal Conductive Properties of a Resistance-Controlled (RC) Interface for No-Insulation (NI) Scheme Coils","authors":"Yuya Tanaka;Yu Suetomi;Mizuho Kawahata;Tomoaki Takao;Kazuya Nakamura;Kensuke Kobayashi;Renzhong Piao;Toshio Yamazaki;Yoshinori Yanagisawa","doi":"10.1109/TASC.2025.3534189","DOIUrl":"https://doi.org/10.1109/TASC.2025.3534189","url":null,"abstract":"REBCO high-temperature superconductors (HTS) provide a technical possibility for a high current density operation of a superconducting magnet. The intra-Layer No-insulation (LNI) method, one of the No-Insulation (NI) schemes, can be a promising solution for improving thermal stability and quench protection characteristics, which are vital to high current density operations. We previously proposed the concept of a resistance-controlled (RC) interface for controlling bypass resistance inside a coil winding and showed its electrical properties related to quench protection. In the present work, we measured the thermal conductive properties of an RC interface with a conduction cooling experiment on NI single pancake coils and numerically evaluated the characteristics of an LNI-REBCO coil implemented with the RC interface. The experimental and numerical results showed that the RC interface has high thermal conductive properties, which can be expected to contribute to the thermal stability of a coil under Joule heat dissipation as well as to cooling characteristics.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-6"},"PeriodicalIF":1.7,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422865","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":"Highly Sensitive Measurement of AC Loss Characteristics of Short and Straight HTS Tapes Under Transverse Magnetic Field by Pickup Coil Method","authors":"Shuma Kawabata;Tadashi Hirayama","doi":"10.1109/TASC.2025.3535851","DOIUrl":"https://doi.org/10.1109/TASC.2025.3535851","url":null,"abstract":"In order to develop high temperature superconducting (HTS) tapes with excellent low-loss characteristics, it is indispensable to have a measurement system capable of measuring the AC loss characteristics of HTS tapes with high sensitivity at 77 K. We have developed a measurement system using the pickup coil method, which can measure the AC loss characteristics of short straight HTS tapes under AC transverse magnetic fields with high sensitivity. In the pickup coil method, pickup coils consist of a main pickup coil for measuring the specimen signal voltage and a compensation coil used to extract only the magnetization signal voltage of the specimen contained in the main pickup coil voltage. In order to increase the sensitivity of AC loss measurement systems using the pickup coil method, background losses, which are apparent losses that occur even when there is no sample in the main pickup coil, must be reduced as much as possible. To reduce background losses, first, a magnet was designed and manufactured to apply external transverse magnetic fields so that a main pickup coil and a compensation coil could be arranged symmetrically. This makes it possible to reduce the phase difference between the main pickup coil voltage and the compensation coil voltage, which is one of the main causes of background losses. Next, background losses were measured using several kinds of pickup coils with different parameters. Furthermore, based on the measurement results, the optimum parameters of the pickup coils were investigated. Finally, background losses could be successfully reduced, and the sensitivity of the AC loss measurement system increased.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-4"},"PeriodicalIF":1.7,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430419","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":"Cryodistribution System for Superconducting Tokamak Magnets","authors":"H.-S. Chang;H. Vaghela;D. Grillot;N. Shah","doi":"10.1109/TASC.2025.3527417","DOIUrl":"https://doi.org/10.1109/TASC.2025.3527417","url":null,"abstract":"The ITER Tokamak, equipped with large-scale superconducting (SC) magnets, requires cryogenic conditions sustained by helium coolant. The operation of these magnets presents significant challenges from the perspective of the helium cryogenic system. These challenges not only include substantial heat loads and their variations, leading to rapid pressure fluctuations in the process helium but also localized nuclear heating effects on the SC coils during the D-T fusion reactions to be managed by the cryogenic system for the safe operation of the magnets. To address these issues economically while ensuring operational stability and reliability, continuous modifications have been implemented throughout the design phases of the cryogenic system. In this proceeding, we provide a comprehensive summary of the design activities to date, offering an overview of how the ITER cryogenic system effectively manages and mitigates the challenges associated with the SC magnets while ensuring cost-effective operation.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-4"},"PeriodicalIF":1.7,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143369907","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":"Applicability of React-and-Wind Method in JA-DEMO TF Conductors With Cu-Nb Reinforced $text{Nb}_{3}text{Sn}$ Strands","authors":"Masahiro Sugimoto;Ryo Taniguchi;Koichi Ebisawa;Kakei Mun;Kengo Nakao;Kiyoshige Hirose;Satoshi Awaji;Hidetoshi Oguro;Hiroyasu Utoh;Yoshiteru Sakamoto","doi":"10.1109/TASC.2025.3535686","DOIUrl":"https://doi.org/10.1109/TASC.2025.3535686","url":null,"abstract":"<inline-formula><tex-math>$text{Nb}_{3}text{Sn}$</tex-math></inline-formula> conductors for JA-DEMO-TF coils require both higher current capacity under larger electromagnetic stress and lower manufacturing costs than ITER-TF <inline-formula><tex-math>$text{Nb}_{3}text{Sn}$</tex-math></inline-formula> conductors. Cu-Nb reinforced <inline-formula><tex-math>$text{Nb}_{3}text{Sn}$</tex-math></inline-formula> (Cu-Nb/<inline-formula><tex-math>$text{Nb}_{3}text{Sn}$</tex-math></inline-formula>) strands produced by Nb rod method have superior mechanical strength properties at room temperature (RT) than conventional non-reinforced Cu/<inline-formula><tex-math>$text{Nb}_{3}text{Sn}$</tex-math></inline-formula> strands, even after the <inline-formula><tex-math>$text{Nb}_{3}text{Sn}$</tex-math></inline-formula> reaction heat-treatment. The React-and-Wind (R&W) processes not only minimize the compressive residual strain of the <inline-formula><tex-math>$text{Nb}_{3}text{Sn}$</tex-math></inline-formula> filaments, but also actively introduce the appropriate pre-stresses, which can improve both the superconducting properties and the mechanical properties. The <inline-formula><tex-math>$I_text{c}$</tex-math></inline-formula> performance under transverse compression stress of the pre-bent and pre-tensioned Cu-Nb/<inline-formula><tex-math>$text{Nb}_{3}text{Sn}$</tex-math></inline-formula> strands was higher than that of Cu/<inline-formula><tex-math>$text{Nb}_{3}text{Sn}$</tex-math></inline-formula> strands. Furthermore, a significant suppression of <inline-formula><tex-math>$I_text{c}$</tex-math></inline-formula> degradation under transverse compression stress was also observed in the pre-bent Cu-Nb reinforced triplex. Therefore, the effective use of the Cu-Nb/<inline-formula><tex-math>$text{Nb}_{3}text{Sn}$</tex-math></inline-formula> strands is expected to allow the manufacturing of cable-in-conduit (CIC) conductors by using React-and-Wind (R&W) method.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-7"},"PeriodicalIF":1.7,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430484","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":"Towards Novel Tunability Schemes for Hybrid Ferromagnetic Transmon Qubits","authors":"Halima Giovanna Ahmad;Raffaella Ferraiuolo;Giuseppe Serpico;Roberta Satariano;Anna Levochkina;Antonio Vettoliere;Carmine Granata;Domenico Montemurro;Martina Esposito;Giovanni Ausanio;Loredana Parlato;Giovanni Piero Pepe;Alessandro Bruno;Francesco Tafuri;Davide Massarotti","doi":"10.1109/TASC.2025.3535674","DOIUrl":"https://doi.org/10.1109/TASC.2025.3535674","url":null,"abstract":"Flux tuning of qubit frequencies in superconducting quantum processors is fundamental for implementing single and multi-qubit gates in quantum algorithms. Typical architectures involve the use of DC or fast RF lines. However, these lines introduce significant heat dissipation and undesirable decoherence mechanisms, leading to a severe bottleneck for scalability. Among different solutions to overcome this issue, we propose integrating tunnel Superconductor-Insulating-thin superconducting interlayer-Ferromagnet-Superconductor Josephson junctions (SIsFS JJs) into a novel transmon qubit design, the so-called ferrotransmon. SIsFS JJs provide memory properties due to the presence of ferromagnetic barriers and preserve at the same time the low-dissipative behavior of tunnel-insulating JJs, thus promoting an alternative tuning of the qubit frequency. In this work, we discuss the fundamental steps towards the implementation of this hybrid ferromagnetic transmon. We will give a special focus on the design, simulations, and preliminary experimental characterization of superconducting lines to provide in-plane magnetic fields, fundamental for an on-chip control of the qubit frequencies in the ferrotransmon.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-7"},"PeriodicalIF":1.7,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430553","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":"Wide-Stopband HTS Dual-Band Bandpass Filter Using a Folded Step Impedance Hairpin-Ring Resonator","authors":"Weijin Yang;Huibin Zhang;Zhaojiang Shang","doi":"10.1109/TASC.2025.3535742","DOIUrl":"https://doi.org/10.1109/TASC.2025.3535742","url":null,"abstract":"This article proposes a novel folded stepped-impedance hairpin-ring resonator and designs a compact sixth-order dual-passband high-temperature superconducting (HTS) filter with a comprehensive wide-stopband response. The design employs a stepped-impedance resonator and a hairpin-ring resonator. The resonator uses a dual-feed structure to achieve external coupling for both passbands. It introduces a U-shaped secondary coupling line between the resonators to flexibly control the internal coupling, enabling independent control of the frequency and bandwidth of the two passbands. Using this method, we designed a sixth-order dual-passband HTS filter. The first passband center frequency is 1.9 GHz with a bandwidth of 40 MHz (2.1% ), and the second passband center frequency is 2.8 GHz with a bandwidth of 70 MHz (2.5% ). The filter was fabricated on a YBa₂Cu₃O₇-δ, (YBCO) HTS thin film on a MgO substrate sized 35 mm × 14.5 mm (0.57λ_g × 0.23λ_g). Measurement results showed good agreement with simulation results, showing excellent passband performance. The return loss is better than 20 dB, and the insertion loss is less than 0.04 dB. The out-of-band rejection is better than 50 dB and can reach as high as 9 GHz.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 3","pages":"1-6"},"PeriodicalIF":1.7,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143465829","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":"Numerical Simulation of Unbalanced Forces on NI REBCO TF Coils During Quench Event","authors":"Riki Sakakibara;So Noguchi","doi":"10.1109/TASC.2025.3534743","DOIUrl":"https://doi.org/10.1109/TASC.2025.3534743","url":null,"abstract":"Rare-earth barium copper oxide (REBCO), which has high superconducting performances under a high magnetic field, attracts attention in the field of compact fusion reactor and so on. Compact fusion reactors consist of several magnets including D-shaped toroidal-field (TF) magnets arranged in a circle to create a toroidal field. Considering the use of no-insulation (NI) REBCO TF magnets for compact fusion reactors, there are a few points to note. One of them is unbalanced forces during the event of quench. The equilibrium state of the electromagnetic forces is disrupted by quench of one NI REBCO TF magnet. Since the NI technique is applied, the current remains in TF magnets with a time delay even when an operating current is cut off externally. Therefore, it is impossible to immediately stop the operation after the detection of quench; it is difficult to control the REBCO-tape-longitudinal currents. In addition, the TF magnets next to the quenched TF magnet have large induced currents. Thus, for NI REBCO TF magnets in compact fusion reactors, unbalanced forces in the overturning directions occur between TF magnets while the currents in the TF magnets decay after the sudden shut-down of current. For this reason, it is necessary to investigate such unbalanced forces working to NI REBCO TF magnets in compact fusion reactors when a quench event happens. In this research, unbalanced overturning forces on NI REBCO TF magnets during quench is numerically investigated.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-4"},"PeriodicalIF":1.7,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430555","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":"Current Redistribution in a Sub-Scale REBCO Dipole","authors":"J. S. Rogers;P. M. McIntyre;C. Bowerman;C. Coats;Z. Kauffman;G. D. May","doi":"10.1109/TASC.2025.3534170","DOIUrl":"https://doi.org/10.1109/TASC.2025.3534170","url":null,"abstract":"A sub-scale dipole has been designed, fabricated, and tested to investigate current re-distribution in a non-insulating, non-transposed rare-earth barium copper oxide (REBCO) tape-stack cable operating in a region of magnetic field gradient. The dipole winding is comprised of one turn of cable containing 12 tapes. An H-geometry steel flux return shapes the field distribution in its dipole gap and produces a nearly linear transverse gradient of field magnitude in the winding. The field gradient determines the critical current (I_c) in successive tapes in the tape-stack cable. As cable current is increased, the I_c limit is approached in the innermost tape, and current is naturally driven to redistribute to the next tape, and so forth, so that premature quench is prevented. Experimental results are presented for several modes of operation to determine the distribution of current and the location(s) in the winding where the current is redistributed. The results serve as a proof-of-concept for using a non-insulating, non-transposed REBCO tape-stack cable and a conformal winding strategy for a high-field insert in an 18 T collider dipole.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430416","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":"Investigating Modeling Approaches in Mechanical Analysis of HTS Tapes Using Open-Source FEM Library Sparselizard","authors":"Hamed Milanchian;Alexandre Halbach;Reijo Kouhia;Tiina Salmi","doi":"10.1109/TASC.2025.3535163","DOIUrl":"https://doi.org/10.1109/TASC.2025.3535163","url":null,"abstract":"Coated conductors based on high temperature superconductors (HTS), such as rare-earth barium copper oxide tapes, are expected to enable future electromagnetic applications to reach magnetic fields beyond 20 T. Understanding their mechanical behavior is crucial, but choosing the right tools and modeling methods can be challenging. This work introduces a new open-source simulation tool that can be used to analyze the strain and stress in HTS tapes. The built-in structural elastic solver in this multiphysics C++ based finite element library is enhanced with a linear hardening elastoplastic method by us. It also offers flexibility for future expansion based on user needs. Detailed and homogenized HTS tape models are explored using the mechanical model with both elastic and elastoplastic analyses. By comparing different approaches, the optimal method can be identified for specific applications. We believe this methodology and tool have the potential for large-scale electromagnetic applications, for instance solenoids and magnets, with the ability to be tailored to specific requirements.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 3","pages":"1-10"},"PeriodicalIF":1.7,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10855516","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403960","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":"Impact of Saturated Iron-Core Superconducting Fault Current Limiters on Traveling Wave Based Fault Location in DC Transmission Lines","authors":"Baohua Liu;Ying Xu;Shuai Hou;Jianzhao Geng","doi":"10.1109/TASC.2025.3531825","DOIUrl":"https://doi.org/10.1109/TASC.2025.3531825","url":null,"abstract":"The advancement of high-voltage direct current (HVDC) transmission is crucial for future smart grids, but it brings challenges like high short-circuit fault currents with rapid rise rates. Saturated iron-core superconducting fault current limiters (SISFCLs), effective in AC systems, also show promise in DC systems. However, they can affect fault location techniques based on traveling waves (TWs) due to their impedance characteristics. This study investigates the impact of SISFCLs on TW-based fault location in DC systems. We analyze this influence analytically and simulate a ±320 kV modular multilevel converter (MMC) DC system in PSCAD/EMTDC, incorporating the SISFCL model computed in COMSOL Multiphysics. Simulations of positive-pole-to-ground faults reveal that SISFCLs reduce the accuracy of TW-based fault location. The paper also outlines future research directions for integrating SISFCLs into DC systems.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143360959","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}