IEEE Transactions on Applied Superconductivity最新文献

{"title":"IEEE Transactions on Applied Superconductivity Information for Authors","authors":"","doi":"10.1109/TASC.2025.3589838","DOIUrl":"https://doi.org/10.1109/TASC.2025.3589838","url":null,"abstract":"","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 6","pages":"C4-C4"},"PeriodicalIF":1.8,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11163611","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145036214","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 Publication Information","authors":"","doi":"10.1109/TASC.2025.3589842","DOIUrl":"https://doi.org/10.1109/TASC.2025.3589842","url":null,"abstract":"","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 6","pages":"C2-C2"},"PeriodicalIF":1.8,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11163615","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145036828","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":"High-Capacity DFF Cells for Unary Computing Using Single-Flux Quantum Circuits","authors":"Zeyu Han;Nobuyuki Yoshikawa;Yuki Yamanashi","doi":"10.1109/TASC.2025.3602472","DOIUrl":"https://doi.org/10.1109/TASC.2025.3602472","url":null,"abstract":"Due to their high-speed operation and low power consumption, single-flux quantum (SFQ) circuits are promising technologies for integrated circuits. However, current superconducting fabrication limitations impose strict area constraints, challenging the construction of large-scale systems. Unary computing (UC) encodes numerical values by concentrating all “1”s at the beginning of a bit sequence. This approach enables arithmetic operations with fewer logic gates, thereby improving the area efficiency. In this article, we propose a novel high-capacity D flip-flop (HC-DFF) cell for UC-based SFQ circuits that achieves high-density data registration while preserving UC encoding. The HC-DFF employs a cascaded storage loop structure in which each loop sequentially stores one flux quantum, avoiding the margin deterioration associated with storing multiple flux quanta in a single loop. Simulation shows that the proposed HC-DFF achieves a bias margin of –20.8% to +32.7% and supports read/write operations above 100 GHz. We fabricated the HC-DFF using a 10 kA/cm² Nb four-layer superconducting process and verified its operation through low-speed measurements. The HC-DFF offers enhanced scalability and stability while reducing the number of required Josephson junctions by 83.3% per bit compared to conventional DFF-based shift registers for saving UC signals. For short unary sequences of less than 31 bits, it retains an advantage over storing binary data with equivalent precision using conventional DFF-based shift registers.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 8","pages":"1-6"},"PeriodicalIF":1.8,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11138032","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144998206","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":"Dynamics of an HTS Pinning Maglev System on a Stability-Enhanced V-Shaped PMG for Urban Transit","authors":"Yuhang Yuan;Lingfeng Gao;Shan Wang;Jianru Liu;Weike Yan;Zigang Deng;Gino D’Ovidio","doi":"10.1109/TASC.2025.3600876","DOIUrl":"https://doi.org/10.1109/TASC.2025.3600876","url":null,"abstract":"High-temperature superconducting (HTS) pinning magnetic levitation (maglev) represents an emerging transportation technology that has attracted significant research interest owing to its intrinsic passive self-stabilization, low energy dissipation, and noise-free operation. Building upon the fundamental principles of HTS pinning, an innovative urban transit system has been designed and developed. In contrast to conventional HTS maglev transportation systems relying on flat-configured permanent-magnet guideways (PMGs), the proposed system incorporates an innovative V-shaped PMG configuration. This structural modification substantially amplifies both vertical levitation and lateral guidance forces, thereby enhancing operational performance and dynamic stability. The system’s technological advancements and dynamic characteristics have been systematically analyzed to assess vehicle dynamics for urban transit applications. Initial simulation results demonstrate technical viability and full compliance with established operational standards at target velocities. This research aims to establish a theoretical foundation for dynamic performance evaluation and engineering design of HTS pinning maglev transportation systems.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 8","pages":"1-9"},"PeriodicalIF":1.8,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145036826","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":"S-Band Low-Noise HTS Filtering Receiver Front-End Subsystem Using Balanced-to-Unbalanced Structure for Radio Astronomy Application","authors":"Wen Liu;Haiwen Liu;Hongliang Tian;Zeren Song;Sidong Wang;Xuehui Guan","doi":"10.1109/TASC.2025.3599861","DOIUrl":"https://doi.org/10.1109/TASC.2025.3599861","url":null,"abstract":"A novel S-band balanced-to-unbalanced low-noise filtering receiver front-end subsystem is proposed in this article. The design employs a differential input, single-ended output receiver architecture to mitigate common-mode noise in the system. The differential receiver and filtering functions are achieved with minimal loss using a wideband high-temperature superconducting filtering balun. The circuit is integrated with a cryogenic low-noise amplifier through optimized interconnects and package design. Test results at an ambient temperature of 15 K demonstrate an in-band gain of 31 dB and an equivalent noise temperature of 19 K, highlighting the system’s potential for radio astronomy applications.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 8","pages":"1-7"},"PeriodicalIF":1.8,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145021361","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":"An Improved Data Conditioning Method for Neural Network Modeling of Superconductor Critical Currents and n-Values","authors":"Christian Hartmann;Casper Klop;Runar Mellerud;Jonas Kristiansen Nøland","doi":"10.1109/TASC.2025.3599231","DOIUrl":"https://doi.org/10.1109/TASC.2025.3599231","url":null,"abstract":"As high-temperature superconductors (HTS) are increasingly being considered for ac applications, it is essential to model the ac losses accurately. Conventional Kim-type critical current models often fail to capture the temperature dependence or high-field anisotropy of HTS materials. By contrast, artificial neural networks (ANNs) can capture parameter variations over large temperature and magnetic field ranges. However, training ANNs properly is challenging when the available experimental data are scarce or scattered. This article introduces an interactive method to transform raw experimental datasets into smooth and conditioned training sets. These extensive datasets are excellent for training ANN models of both critical current and power-law index parameters with standard machine learning tools. The method has been validated on three HTS products. All R-values exceed 0.96, and the models show no spurious behavior. Self-field fluctuations stay below <inline-formula><tex-math>$mathbf {pm }$</tex-math></inline-formula>0.71%, and there are no excessively steep partial derivatives. In comparison, ANN models trained directly on the raw data yield self-field fluctuations up to <inline-formula><tex-math>$mathbf {pm }$</tex-math></inline-formula>22.9<bold>%</b>, and the partial derivatives reach unacceptable values for the n-value models. These findings indicate that ANN-based HTS models can improve modeling accuracy in ac applications by at least one order of magnitude.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 7","pages":"1-11"},"PeriodicalIF":1.8,"publicationDate":"2025-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144926872","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":"A Universal Quantum Phase Slip Logic Gate for Implementing Basic Boolean Functions","authors":"Babak Dastbarjan Boroujeni;Seyed Amir Hashemi;Satyabrata Jit","doi":"10.1109/TASC.2025.3598282","DOIUrl":"https://doi.org/10.1109/TASC.2025.3598282","url":null,"abstract":"Quantum phase slip (QPS) junction can act as a superconductor switch when a voltage pulse larger than its critical voltage is applied to it. As a result, a current pulse with an area equal to 2<italic>e</i> (or multiples of 2<italic>e</i>) flows across the junction, and the junction switches from zero to one in the charge-base logic. For having a proper operation simulation of the QPS junction, it should be overdamped, and the damping factor should be less than one. Physical parameters of the QPS junction, namely, the normal resistance, the kinetic inductance, and the critical voltage, can affect the overdamping condition and switching behavior of the junction, as well as the damping factor. The basic block for designing the QPS logic gates is the charge island. By different and proper connections of the charge islands, basic QPS <sc>and, or</small>, and <sc>xor</small> logic gates are designed. Generally, each of these gates has its own circuit and junction parameters for proper operation. In this manuscript, a universal QPS logic gate is proposed that can perform basic <sc>and, or</small>, and <sc>xor</small> Boolean functions by proper selection of parameters for QPS junctions in the case of each Boolean function. This universal QPS logic gate can simplify the design the complicated QPS logic circuits, since only the parameters of each junction have to be properly selected for achieving the desired Boolean function, and the gate circuit topology remains unchanged.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 7","pages":"1-7"},"PeriodicalIF":1.8,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144909296","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":"AC Loss Analysis of Parallel Superconducting Coil Used in Multiphase Superconducting Armature Permanent Magnet Electrical Machine","authors":"Xinkai Zhu;Yupeng Zhao;Minmin Li;Runqian Li;Baozhi Liu","doi":"10.1109/TASC.2025.3597445","DOIUrl":"https://doi.org/10.1109/TASC.2025.3597445","url":null,"abstract":"The phase current of mega watt (MW) class superconducting (SC) armature permanent magnet electrical machine (SCPMM) is quite high, usually from several hundred amperes to 1 kA, therefore, the current-carrying capacity of a single SC tape is insufficient to meet the phase current requirements. The main purpose of this article is to investigate a kind of parallel SC coils and analyze the arrangement of multiphase SC armature windings and its loss regularity under external magnetic fields. The main effect factors of parallel SC coils on ac loss are obtained under the conditions of self-field and external periodic magnetic field and a kind of arrangement of the low-loss parallel coils are proposed through coordinating spatial distribution of SC coils and phase shift of transmitting current. This work provides references for the design optimization multiphase SCPMSM.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 7","pages":"1-7"},"PeriodicalIF":1.8,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144909345","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":"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}