IEEE Transactions on Applied Superconductivity最新文献

{"title":"Analysis on the Bending Performance of a High-Current Superconducting CORC-Type Cable","authors":"Yuxi Liu;Tao Ma;Shaotao Dai;Yangyang Shi;Junfeng Yang;Liguang Hu;Jian Cheng;Bangzhu Wang","doi":"10.1109/TASC.2025.3604066","DOIUrl":"https://doi.org/10.1109/TASC.2025.3604066","url":null,"abstract":"There are various types of high-current high-temperature superconducting (HTS) cables by using of REBCO tape. Cable on round core (CORC) is a high current HTS cable using REBCO tape, known for its high current carrying capacity and flexibility. CORC cables are subjected to various mechanical stresses during operation, including bending stresses during cabling, winding, and cryocooling. Due to the multilayer structure of high current CORC, the study of the bending characteristics of CORC cables has become more important. In order to investigate the current carrying and bending properties of the CORC cable, the 2-D critical current simulation of a 24-layer CORC-type cable is carried out to analyze the self-field distribution and current density distribution, and the calculated critical current of the cable under self-field at 77 K is about 5734 A. Subsequently, several samples were fabricated and tested at 77 K. The influence of bending stress on the critical current of CORC-type cable was studied to determine the critical bending radius of CORC-type cable. The results show that the maximum critical current of the 24-layer CORC-type cable under self-field at 77 K is 5.9 kA, and the critical bending radius is less than 50 mm, demonstrating the high current capacity and flexibility of the large-current CORC-type cable.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 8","pages":"1-8"},"PeriodicalIF":1.8,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145027898","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":"Quench and Recovery Characteristic of DC Current Limiting Type CORC Cable","authors":"Xiaolong Ke;Fangxin Li;Tao Ma;Lei Hu","doi":"10.1109/TASC.2025.3603787","DOIUrl":"https://doi.org/10.1109/TASC.2025.3603787","url":null,"abstract":"The conductor on round core (CORC) superconducting cable composed of YBa₂Cu₃O₇ (YBCO) conductors has high power density and low energy dissipation characteristics, showing significant potential in efficient electric energy transmission. Its abrupt transition from superconducting state to normal state provides a good solution for designing cable-type fault current limiters. This study investigates the effects of insulation layer placement and winding configuration on the resistance behavior, temperature rise of YBCO tapes, and recovery time of CORC cables during quench processes. A 2-D radial electro-magnetic-thermal coupled simulation model is developed to analyze and predict the temperature evolution of the YBCO layer under different cable structures. Representative configurations are selected for sample fabrication and experimental validation to explore the underlying causes of variations in quench resistance and recovery characteristics. The findings provide theoretical support and experimental basis for the design of CORC cable-based superconducting fault current limiters.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 8","pages":"1-7"},"PeriodicalIF":1.8,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145027907","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":"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":"Risk Assessment of EIC Central Detector (ePIC) Solenoid Magnet (MARCO)","authors":"Probir K. Ghoshal;Christophe Berriaud;Valerio Calvelli;Sandesh Gopinath;F. P. Juster;J-P. Lottin;Hugo Reymond;Michel Segreti;Rahul Sharma;Damien Simon;Francesco Stacchi;Eric Sun;Roberto Than;Roland Wimmer;Daniel Young;Renuka Rajput-Ghoshal","doi":"10.1109/TASC.2025.3599725","DOIUrl":"https://doi.org/10.1109/TASC.2025.3599725","url":null,"abstract":"As part of the BNL-JLab-CEA Electron Ion Collider (EIC) collaboration, the design of a 2 T, 2.8 m bore diameter, 3.8 m long conduction cooled superconducting detector magnet design is completed. Such a magnet will be employed at the interaction region of ePIC for physics experiments. The magnet is a passive shielded solenoidal magnet system consisting of three coils wound with a specially designed conductor using niobium-titanium (NbTi) Rutherford-type cable in a copper-stabilized channel. This article describes the risk analysis as the part of failure modes and effects analysis (FMEA) that was carried out as a team to identify their various failure modes and risks associated with the magnet system. This FMEA is intended to become the content of the designed document as an integral part of the engineering assessment and the statement of work for the potential vendors toward design and built.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 8","pages":"1-6"},"PeriodicalIF":1.8,"publicationDate":"2025-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145223695","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":"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":"A Field-Circuit Coupled Model for Efficiently Simulating the Charging Characteristics and Losses in No-Insulation HTS Coils","authors":"Shuai Zhang;Guangtong Ma;Tianyong Gong;Ruichen Wang;Lihao Liu;Pengbo Zhou","doi":"10.1109/TASC.2025.3599151","DOIUrl":"https://doi.org/10.1109/TASC.2025.3599151","url":null,"abstract":"No-insulation (NI) high-temperature superconductor (HTS) coils introduce turn-to-turn electrical paths, enhancing their thermal stability and self-protection capacity against quenching. However, the extra turn-to-turn electrical paths complicate both the geometrical and physical modeling of HTS coils. This article presents a field-circuit coupled model where the HTS component is treated as a global voltage parameter that contains resistive and inductive voltage in the circuit model. The superconducting branch current in the circuit model serves as external current input to the NI HTS coil. The finite element method model is based on an anisotropic resistivity model governed by the <inline-formula><tex-math>$mathbf {J}$</tex-math></inline-formula>–<inline-formula><tex-math>$mathbf {A}$</tex-math></inline-formula> formulation, considering the current-sharing effect of the metal layers in the coated conductor under overcritical current state. To validate the proposed model comprehensively, two key characteristics are illustrated: first, comparing experimental measurement data of sudden discharging, charging, and overcritical current state; second, comparing computing efficiency with the prevailing <inline-formula><tex-math>$mathbf {H}$</tex-math></inline-formula>-formulation model. The results show that the calculated results are in good agreement with the experiment, the validity, and applicability of the proposed model are well verified. In comparison to the <inline-formula><tex-math>$mathbf {H}$</tex-math></inline-formula>-formulation model, the computational efficiency of the proposed model is improved by more than 82% without sacrificing the computational accuracy. In addition, with the proposed model, it has been found that the current-sharing effect of the metal layers is negligible in the overcritical current state. To verify the wider applicability of the proposed model, we simulated charging the closed-loop NI HTS coils with a flux pump. The proposed model can better characterize the voltage source excitation properties and analyze the frequency saturation of the charging time constant. Based on this, we have further investigated the superconducting resistive losses as well as the turn-to-turn losses at different traveling wave frequencies.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 7","pages":"1-17"},"PeriodicalIF":1.8,"publicationDate":"2025-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144990142","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}