IEEE Transactions on Applied Superconductivity最新文献_第2页

AC Loss Measurements at High B, dB/dt for ReBCO Tape Stacks With Various Values of Tape Separation and Loss in Helically Wound Cables 在高B、dB/dt条件下，螺旋缠绕电缆中具有不同带分离和损耗值的ReBCO带堆的交流损耗测量

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-03-27 DOI: 10.1109/TASC.2025.3555223

J. Kwon;C. Ebbing;T. Haugan;M. D. Sumption;E. W. Collings

{"title":"AC Loss Measurements at High B, dB/dt for ReBCO Tape Stacks With Various Values of Tape Separation and Loss in Helically Wound Cables","authors":"J. Kwon;C. Ebbing;T. Haugan;M. D. Sumption;E. W. Collings","doi":"10.1109/TASC.2025.3555223","DOIUrl":"https://doi.org/10.1109/TASC.2025.3555223","url":null,"abstract":"The demand for high-power motors and generators for electric aircraft requires conductors with performance above that of ambient temperature Cu and Al. High current density superconducting Re-Ba-Cu-O (ReBCO) conductors and cables are of interest, but AC loss characterization under relevant excitation is needed. In this work, we explored the AC losses of ReBCO tapes, tape stacks, and round (CORC) cables at aircraft motor/generator relevant fields and frequencies. The measurements were performed using a previously described Spinning-Magnet-Calorimeter (SMC), where a superconducting sample is placed in an LN<sub>2</sub> bath and exposed to the magnetic fields of a spinning magnetic Halbach array. In this system, loss is measured using a calorimetric method (measuring the LN<sub>2</sub> boil off). Previous work has shown a significant shielding effect with higher numbers of ReBCO tapes in a stack. This present work looks at the reduction of this shielding with increased tape-to-tape separation distance in stacked tape samples. This work also explored loss in CORC cables with different numbers of layers, and compared the loss per tapes for CORC conductors with different numbers of layers (and with both striated and unstriated tapes). The magnitude of the shielding as a function of layers is compared for the two conductors.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-6"},"PeriodicalIF":1.7,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143821887","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

Preliminary Test of a Layer-Wound D-Shaped Coil Using Stacked HTS Conductor for a Miniature Toroidal Field Magnet 叠置高温超导导体层绕d形线圈用于小型环形磁场磁体的初步试验

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-03-27 DOI: 10.1109/TASC.2025.3555219

Jiho Lee;Bonghyun Cho;Sangjun Oh;Heekyung Choi;Won Woo Park;Dohyun Baek;Ye Lim Lee;Kyunghan Jun;Seungyong Hahn

{"title":"Preliminary Test of a Layer-Wound D-Shaped Coil Using Stacked HTS Conductor for a Miniature Toroidal Field Magnet","authors":"Jiho Lee;Bonghyun Cho;Sangjun Oh;Heekyung Choi;Won Woo Park;Dohyun Baek;Ye Lim Lee;Kyunghan Jun;Seungyong Hahn","doi":"10.1109/TASC.2025.3555219","DOIUrl":"https://doi.org/10.1109/TASC.2025.3555219","url":null,"abstract":"High-temperature superconductors (HTS) are promising for fusion applications due to their thermal stability and high current density. We introduce stacks-in-conduit conductors (SICC) as a non-twisted alternative to traditional cable-in-conduit conductors (CICC), offering simpler fabrication while maintaining performance. Two layer-wound D-shaped coils were fabricated using stacked REBCO tapes for a miniature Toroidal Field (TF) magnet. Preliminary tests demonstrated successful current transport beyond 1100 A with typical superconducting characteristics. Two variants of the D-shaped coil were tested: one wound with substandard REBCO tapes and another with manufacturer-certified REBCO tapes. Additionally, experimental results indicate that layer-winding is an effective method for constructing HTS coils without internal joints. In the planned full operation, the D-shaped toroidal coil will be tested at 20 K and an operating current of 8 kA, with the maximum magnetic field anticipated to reach around 4.5 T.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-6"},"PeriodicalIF":1.7,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865267","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

Electromagnetic Force and Fault-Current Limitation of Self-Shielded HTS DC Cable Under Short-Circuit Current 短路电流下自屏蔽高温超导直流电缆的电磁力与故障限流

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-03-26 DOI: 10.1109/TASC.2025.3554723

Bowei Li;Wei Pi;Junhao Liang;Zhuofan Li;Yinshun Wang

引用次数: 0

Design of HOM Damped Multi-Cell SRF Cavities for CW Operation in High Current Storage Rings 大电流存储环中连续波工作的HOM阻尼多单元SRF腔的设计

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-03-26 DOI: 10.1109/TASC.2025.3554959

Andranik Tsakanian;Adolfo Vélez;Emmy Sharples-Milne;Jens Knobloch

{"title":"Design of HOM Damped Multi-Cell SRF Cavities for CW Operation in High Current Storage Rings","authors":"Andranik Tsakanian;Adolfo Vélez;Emmy Sharples-Milne;Jens Knobloch","doi":"10.1109/TASC.2025.3554959","DOIUrl":"https://doi.org/10.1109/TASC.2025.3554959","url":null,"abstract":"Currently, superconducting RF (SRF) systems for high-current storage rings are generally limited to low-frequency, moderate voltage, and single-cell cavities. For a new class of cavities to be used in longitudinal beam phase-space manipulation, high-voltage third harmonic multi-cell cavities are required, resulting in very challenging impedance considerations and higher-order mode (HOM) powers of the order of several kW per cavity. Thus, the cavity design requires far more attention on the HOM spectrum to be off-resonance with circulating beam harmonics. Special techniques have been developed to analyze the HOM spectrum and damping beyond the standard frequency range, which typically lies at a few GHz, as required by the VSR Demo project. Within the presented work, a four-cell 1.5 GHz cavity is designed including end-groups with multi-waveguide damping for a space-saving design capable of handling over 2.5 kW of HOM power per cavity. These cavities are designed for high-voltage operation with beam currents of at least 300 mA. Prototype systems are now in production. This article provides an overview of the advanced techniques for SRF cavity design and their application to tailoring the HOM spectrum and its application for the VSR Demo project.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 4","pages":"1-16"},"PeriodicalIF":1.7,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10938967","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143875275","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

Design of Hopfield Networks Based on Superconducting Coupled Oscillators 基于超导耦合振荡器的Hopfield网络设计

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-03-26 DOI: 10.1109/TASC.2025.3545409

Ran Cheng;Christoph Kirst;Dilip Vasudevan

{"title":"Design of Hopfield Networks Based on Superconducting Coupled Oscillators","authors":"Ran Cheng;Christoph Kirst;Dilip Vasudevan","doi":"10.1109/TASC.2025.3545409","DOIUrl":"https://doi.org/10.1109/TASC.2025.3545409","url":null,"abstract":"The global energy shortage has driven the development of many energy-efficient computational platforms beyond Moore's law, among which brain-inspired neuromorphic computing is one of the promising solutions. Associative memory and pattern recognition are important computations solved by brain-inspired Hopfield networks. Classical Hopfield networks store memories via fixed point attractors of their dynamics. In oscillatory Hopfield networks, these attractors are replaced by periodic orbits. Here, we design an oscillatory Hopfield network based on coupled superconducting oscillators. We first employ a mathematical phase reduction approach to map networks of coupled superconducting rapid single flux quantum (RSFQ) ring oscillators to coupled Kuramoto phase-oscillator networks. We use this theory to numerically optimize the hardware's mutual inductances in order to directly match the phase-reduced superconducting oscillators to a model of phase-oscillator-based Hopfield networks. The resulting network can store multiple oscillatory phase-locked memory patterns and recover the patterns based on the initial phase conditions. As different pattern recognition tasks, or learning, require tunable connectivity strengths between the oscillatory nodes, we further employ a coupler circuit that enables tuning the coupling strength between two oscillators by applying an external flux. We demonstrate the functionality of our design through numerical simulations of a small example network with oscillators operating at 86 GHz and recognizing patterns within 10 ns. Our approach enables the learning and retrieval of dynamical memory patterns with a wide range of applications where rhythmic dynamic output is beneficial.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-9"},"PeriodicalIF":1.7,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143706615","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

Characteristic Timescales for the Operation of HTS CICCs in Compact Fusion Reactors 紧凑型聚变反应堆中高温超导CICCs运行的特征时间尺度

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-03-25 DOI: 10.1109/TASC.2025.3554466

Marco Breschi;Laura Savoldi;Lorenzo Cavallucci;Luca Bottura

引用次数: 0

Realization of a Monolithic, Planar SLUG Amplifier for the Quantum Electronics Toolbox 用于量子电子工具箱的单片平面SLUG放大器的实现

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-03-24 DOI: 10.1109/TASC.2025.3549394

Gemma Chapman;Tom Godfrey;Jamie Potter;Laith Meti;Parth Bhandari;Ed Romans;John Gallop;Ling Hao

引用次数: 0

Optimization Design of Superconducting Shielding Layer in Double-Stator HTS Electrical Machine 双定子高温超导电机超导屏蔽层的优化设计

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-03-24 DOI: 10.1109/TASC.2025.3553833

Qidong Zhan;Xianglin Li;Mingzhe Sang;Shaorui Wang;Zhiheng Zhang;Haoyu Wang;Xinkai Zhu;Wei Hua

{"title":"Optimization Design of Superconducting Shielding Layer in Double-Stator HTS Electrical Machine","authors":"Qidong Zhan;Xianglin Li;Mingzhe Sang;Shaorui Wang;Zhiheng Zhang;Haoyu Wang;Xinkai Zhu;Wei Hua","doi":"10.1109/TASC.2025.3553833","DOIUrl":"https://doi.org/10.1109/TASC.2025.3553833","url":null,"abstract":"High-temperature superconducting (HTS) electrical machines can offer high efficiency and power density, but the HTS magnets in these machines commonly suffer performance degradation caused by external alternating magnetic fields. Hence, superconducting shielding layers (SSLs) are used to enhance the critical current and reduce the AC loss of HTS magnets. Therefore, optimizing the design of SSLs is crucial to achieving the optimal performance of HTS magnets. In this paper, focusing on a double-stator HTS machine (DS-HTSM), a layered multi-objective optimization design based on parameter sensitivity analysis is conducted for SSLs, in which both the structural parameters and positions of SSLs are optimized simultaneously. A quantitative performance comparison of HTS magnets between initial and optimal design is conducted by using the finite element analysis (FEA), and the results demonstrate an improvement in the critical current safety margin, a significant reduction in AC loss, and effective space utilization, thus providing valuable insights for the design of high-performance HTS electrical machines.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-7"},"PeriodicalIF":1.7,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817994","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

Design and Implementation of a Mechanical Semipersistent Switch for HTS Magnets 高温超导磁体机械半持久开关的设计与实现

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-03-21 DOI: 10.1109/TASC.2025.3553635

Timon Käser;Snædís Björgvinsdóttir;Chukun Gao;Pin-Hui Chen;Michael Urban;Ronny Gunzenhauser;Alexander Däpp;Nicholas Alaniva

{"title":"Design and Implementation of a Mechanical Semipersistent Switch for HTS Magnets","authors":"Timon Käser;Snædís Björgvinsdóttir;Chukun Gao;Pin-Hui Chen;Michael Urban;Ronny Gunzenhauser;Alexander Däpp;Nicholas Alaniva","doi":"10.1109/TASC.2025.3553635","DOIUrl":"https://doi.org/10.1109/TASC.2025.3553635","url":null,"abstract":"Persistent-mode operation of superconducting magnets requires a persistent switch, usually a heater, to close their superconducting circuits. Here, we describe a mechanical copper switch that utilizes pressure to vary resistance. This switch is designed to provide a low-resistance short between two high-temperature superconducting (HTS) charging electrodes in an all-HTS pancake-coil magnet. The switch is able to achieve a contact resistance as low as 460 nΩ by pressing gold-coated copper surfaces together at 3.0 kN. At 77 K, with an HTS pancake coil charged to 0.45 T, the magnetic field decayed slowly with the switch closed. The decay fits to a 3.6-µΩ resistance, most of which arises from unrelated insufficient connections within the HTS magnet itself. The design shows the potential of building a persistent-mode superconducting magnet with a mechanical switch, where, as an example, a 30-T magnet with an inductance of 5.9 H has a field drift of −6 ppm/h.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 4","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10936986","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808935","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

Compact Superconducting Kinetic Inductance Traveling Wave Parametric Amplifiers With On-Chip rf Components 紧凑超导动力电感行波参量放大器与片上射频元件

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-03-21 DOI: 10.1109/TASC.2025.3553466

L. Howe;A. Giachero;M. Vissers;J. Wheeler;J. Austermann;J. Hubmayr;J. Ullom

{"title":"Compact Superconducting Kinetic Inductance Traveling Wave Parametric Amplifiers With On-Chip rf Components","authors":"L. Howe;A. Giachero;M. Vissers;J. Wheeler;J. Austermann;J. Hubmayr;J. Ullom","doi":"10.1109/TASC.2025.3553466","DOIUrl":"https://doi.org/10.1109/TASC.2025.3553466","url":null,"abstract":"Quantum computing systems and fundamental physics experiments using superconducting technologies frequently require signal amplification chains operating near the quantum limit of added noise. Both Josephson parametric amplifiers (JPAs) and traveling wave parametric amplifiers (TWPAs) have been used as first-stage amplifiers to enable readout chains operating within a few quanta or less of the quantum limit. These devices are also presently entering the commercial industry. However, nearly all demonstrations and existing products require bulky external microwave components for interconnection and application of requisite biases. These components – cabling interconnects, bias tees, directional couplers, and diplexers – increase the overall amplifier footprint, installation complexity, and reduce already limited available cryogenic volumes. Additionally, these components introduce loss and reflections which impact the measurement efficiency and readout system noise performance; thus making it more difficult to operate near the quantum limit. Here we present the design and validation of microfabricated bias tees and directional couplers for operating three-wave mixing kinetic inductance TWPAs (KITs). We report the performance of KITs integrated with the microfabricated rf components. Using these devices we demonstrate reduction in the amplifier installation footprint by a factor of nearly five and elimination of all external, lossy microwave components previously required to operate a KIT. Our device displays a 2.8 GHz 3 dB bandwidth with a median true gain of 17.5 dB and median system noise of 3.4 quanta. These efforts represent the first full integration of all rf components mandatory for TWPA operation on-chip. Our results mark significant progress towards the miniaturization and simplification of parametric amplifier setups and will aid in their more widespread applicability.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-7"},"PeriodicalIF":1.7,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143777882","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