Superconductor Science and Technology最新文献_第6页

Low-frequency electrodynamics in the mixed state of superconducting NbN and a-MoGe films using two-coil mutual inductance technique 利用双线圈互感技术研究超导 NbN 和 a-MoGe 薄膜混合态的低频电动力学

Superconductor Science and Technology Pub Date : 2024-07-21 DOI: 10.1088/1361-6668/ad5a45

Somak Basistha, Soumyajit Mandal, John Jesudasan, Vivas Bagwe and Pratap Raychaudhuri

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Development of a multi-pancake HTS magnet operated in persistent current mode based on superconducting joint of REBCO coated conductors 开发基于 REBCO 涂层导体超导连接的持续电流模式下运行的多薄饼 HTS 磁体

Superconductor Science and Technology Pub Date : 2024-07-18 DOI: 10.1088/1361-6668/ad5b26

Daxing Huang, Hao Dong, Tongxin Wang, Hongwei Gu and Fazhu Ding

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Intelligent surrogate model of a high-temperature superconducting cable for reliable energy delivery: short-circuit fault performance 用于可靠能源输送的高温超导电缆智能代用模型：短路故障性能

Superconductor Science and Technology Pub Date : 2024-07-18 DOI: 10.1088/1361-6668/ad59d0

Alireza Sadeghi, Wenjuan Song and Mohammad Yazdani-Asrami

{"title":"Intelligent surrogate model of a high-temperature superconducting cable for reliable energy delivery: short-circuit fault performance","authors":"Alireza Sadeghi, Wenjuan Song and Mohammad Yazdani-Asrami","doi":"10.1088/1361-6668/ad59d0","DOIUrl":"https://doi.org/10.1088/1361-6668/ad59d0","url":null,"abstract":"High-temperature superconducting (HTS) cables are promising solutions for electric power transmission of renewable energy resources, where their fault performance study is vital to avoid power interruptions in the grid. In this study, a fast intelligent surrogate model was presented to estimate the fault performance of a 22.9 kV/50 MW HTS cable to make fast fault performance analysis of the HTS cables possible during the design stage. Different fault scenarios were considered under different fault durations, fault resistances, and types of faults. Then, the fault energy, fault current, fault type, fault duration, and fault resistance were fed into the surrogate model as inputs. The outputs were the temperature of the rare-earth barium copper oxide (ReBCO) tapes, the former temperature, the ReBCO layer current, and the total resistance of each phase. For surrogate modelling, cascade forward neural networks (CFNNs) were used. The results show that the CFNN-based model estimated the fault performance of the cable with an average accuracy of 99.1%. Finally, the impact of considering fault energy, fault current, and both, as the inputs of the models, on the final accuracy were explored. The results show that by considering the fault energy, the accuracy of the surrogate model can be increased.","PeriodicalId":21985,"journal":{"name":"Superconductor Science and Technology","volume":"107 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141741181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Analysis of current and heat transfer in location with reduced critical current in coated conductor tape 带涂层导体胶带中临界电流降低位置的电流和传热分析

Superconductor Science and Technology Pub Date : 2024-07-17 DOI: 10.1088/1361-6668/ad6484

F. Gomory, J. Šouc

{"title":"Analysis of current and heat transfer in location with reduced critical current in coated conductor tape","authors":"F. Gomory, J. Šouc","doi":"10.1088/1361-6668/ad6484","DOIUrl":"https://doi.org/10.1088/1361-6668/ad6484","url":null,"abstract":"\u0000 Variation of critical current along the conductor length is the feature commonly encountered in industrially produced REBCO tapes called coated conductors (CC). Reduction of critical current exceeding several percent in the portions few millimetres long can be observed in the data obtained by reel-to-reel characterisation provided by manufacturers. Metallic layers in the CC architecture can take over some current in such „weak spot”, and help to keep the local temperature stable, preventing its thermal runaway and conversion to a “hot spot”. Understanding the phenomenon is particularly crucial when the space and weight limitations do not allow to add metallic layer with the thickness, that would be sufficient to match the lost transport capability of superconductor. For this purpose, we studied a set of samples, representing both standard as well as infrequent profiles of weak spots identified in direct transport experiments. Analytical theory was then utilised as basic tool for recovering the properties serving as input for numerical modelling. Temperature profiles and current redistribution in the weak spot locations were found, and the effect of cooling conditions and metallic layer thickness on the weak spot resistance against thermal runaway analysed. Quantitative assessment of the possibility to improve the performance of CC tape by adding Cu stabilising layer or improving cooling settings could help to optimise the architecture of coated conductor intended for use in electric transport.","PeriodicalId":21985,"journal":{"name":"Superconductor Science and Technology","volume":" 23","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141830286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

AC losses calculation of No-electrical-insulation HTS magnets with field-circuit coupling method

Superconductor Science and Technology Pub Date : 2024-07-15 DOI: 10.1088/1361-6668/ad637c

Ruichen Wang, Guangtong Ma, Pengbo Zhou, Songlin Li, Boqiang Liu, Weikang Tian

{"title":"AC losses calculation of No-electrical-insulation HTS magnets with field-circuit coupling method","authors":"Ruichen Wang, Guangtong Ma, Pengbo Zhou, Songlin Li, Boqiang Liu, Weikang Tian","doi":"10.1088/1361-6668/ad637c","DOIUrl":"https://doi.org/10.1088/1361-6668/ad637c","url":null,"abstract":"\u0000 No-electrical-insulation (NEI) magnets gradually exhibit significant appeal due to their robust thermal stability and elevated mechanical strength. However, when exposed to AC conditions, the magnets would suffer more significant AC losses in dynamic electromagnetic devices, such as motors and maglev systems. Presently, the numerical methods for predicting the electromagnetic and loss behaviors of large-scale NEI magnets entail high computation costs due to the substantial degrees of freedom or complicated modeling strategies. Thus, we propose a fully finite-element method referred to the field-circuit coupling method to efficiently assess the overall behaviors of NEI magnets while preserving adequate accuracy. This method couples the T-A formula and the single-turn equivalent circuit through global voltage, to avoid the costly and complicated inductance calculation, and to simultaneously consider the induced current. By further integrating the homogenization method, the calculation speed can be increased up to ten times. Additionally, we study the critical current, electromagnetic and loss behaviors of the NEI magnets based on the proposed model. We identify some measurement methods that offer more precise estimations of the critical current and the turn-to-turn contact resistance of NEI magnets. Meanwhile, the results indicate the severe impact of high AC fields on the losses, and emphasize the importance of a reliable shielding structure for operational safety. Finally, the influence of turn-to-turn contact resistivity on the loss behavior is also investigated, which can provide valuable insights for the design of the NEI magnets in dynamic electromagnetic devices.","PeriodicalId":21985,"journal":{"name":"Superconductor Science and Technology","volume":"29 22","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141645709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nuclear magnetic resonance investigation of superconducting and normal state Nb3Sn 超导态和正常态 Nb3Sn 的核磁共振研究

Superconductor Science and Technology Pub Date : 2024-07-15 DOI: 10.1088/1361-6668/ad5fbf

Gan Zhai, William P Halperin, Arneil P Reyes, Sam Posen, Zuhawn Sung, Chiara Tarantini, Michael D Brown and David C Larbalestier

引用次数: 0

Thermal-electrical analogy for simulations of superconducting power cables 模拟超导电力电缆的热电类比法

Superconductor Science and Technology Pub Date : 2024-07-15 DOI: 10.1088/1361-6668/ad637b

Wescley Tiago Batista de Sousa, D. Kottonau, J. M. Pina, A. Morandi, M. Noe

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Theoretical proposal for a broadband on-chip multistage quantum amplifier 宽带片上多级量子放大器的理论建议

Superconductor Science and Technology Pub Date : 2024-07-14 DOI: 10.1088/1361-6668/ad44e1

Rutian Huang, Yunfan Shi, Jianshe Liu and Wei Chen

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A platform to study defect-induced behavior in high-temperature superconductor cables 研究高温超导体电缆缺陷诱导行为的平台

Superconductor Science and Technology Pub Date : 2024-07-11 DOI: 10.1088/1361-6668/ad5c08

Richard T Ibekwe, Nicolò Riva, Dennis G Whyte, Vanessa J Sanchez and Zachary S Hartwig

{"title":"A platform to study defect-induced behavior in high-temperature superconductor cables","authors":"Richard T Ibekwe, Nicolò Riva, Dennis G Whyte, Vanessa J Sanchez and Zachary S Hartwig","doi":"10.1088/1361-6668/ad5c08","DOIUrl":"https://doi.org/10.1088/1361-6668/ad5c08","url":null,"abstract":"High-temperature superconductor (HTS) cables and magnets are enabling a range of high-current and high-field applications, including compact fusion devices aiming to achieve net energy. Defects in HTS pose manufacturing, cost, and operational challenges. A rigorous understanding and predictive capability for defect-induced behavior at relevant scale has not been established. To address this shortcoming, we have developed a cable-level defect characterization experimental platform coupled to high-fidelity computational modeling. The cable ( 438 A at 77.4 K, self-field) comprises a non-twisted 70 cm-long copper former containing a soldered stack of five rare-earth barium copper oxide (REBCO) tapes (each with = 115.7 A/4 mm-w at 77.4 K, self-field), which can contain a variety of induced defects. Spatially-resolved electric fields are measured with a high-density voltage tap array and absolute current distribution with six custom-wound embedded Rogowski coils. 3D circuit modeling uses nodal analysis and self-consistently accounts for the magnetic field dependence of critical current. The model successfully predicts the experimentally measured spatial and operating current dependencies of electric field and current distribution with no defects, one defect, and two defects, validating the defect characterization platform as a tool for improving the design, cost, fabrication, and operation of REBCO cables.","PeriodicalId":21985,"journal":{"name":"Superconductor Science and Technology","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141613691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quench protection for high-temperature superconductor cables using active control of current distribution 利用电流分配主动控制为高温超导体电缆提供淬火保护

Superconductor Science and Technology Pub Date : 2024-07-11 DOI: 10.1088/1361-6668/ad6216

M. Marchevsky, S. Prestemon

{"title":"Quench protection for high-temperature superconductor cables using active control of current distribution","authors":"M. Marchevsky, S. Prestemon","doi":"10.1088/1361-6668/ad6216","DOIUrl":"https://doi.org/10.1088/1361-6668/ad6216","url":null,"abstract":"\u0000 Superconducting magnets of future fusion reactors are expected to rely on composite high-temperature superconductor (HTS) cable conductors. In presently used HTS cables, current sharing between components is limited due to poorly defined contact resistances between superconducting tapes or by design. The interplay between contact and termination resistances is the defining factor for power dissipation in these cables and ultimately defines their safe operational margins. However, the current distribution between components along the composite conductor and inside its terminations is a priori unknown, and presently, no means are available to actively tune current flow distribution in real-time to improve margins of quench protection. Also, the lack of ability to electrically probe individual components makes it impossible to identify conductor damage locations within the cable. In this work, we address both problems by introducing active current control of current distribution between components using cryogenically operated metal-oxide-semiconductor-field-effect transistors (MOSFETs). We demonstrate through simulation and experiments how real-time current controls can help to drastically reduce heat dissipation in a developing hot spot in a two-conductor model system and help identify critical current degradation of individual cable components. Prospects of other potential uses of MOSFET devices for improved voltage detection, AC loss-driven active quench protection, and remnant magnetization reduction in HTS magnets are also discussed.","PeriodicalId":21985,"journal":{"name":"Superconductor Science and Technology","volume":"127 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141656816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0