Superconductor Science and Technology最新文献_第5页

2D axisymmetric electromagnetic modeling of HTS coils based on T-A formulation with modified Newman boundary conditions 基于 T-A 公式和修正纽曼边界条件的 HTS 线圈二维轴对称电磁建模

Superconductor Science and Technology Pub Date : 2024-07-24 DOI: 10.1088/1361-6668/ad6718

Yong Chen, Qiuliang Wang, Kangshuai Wang, Benzhe Zhou, Shixian Liu, Xiaoyu Ji, Lei Wang, Jianhua Liu

{"title":"2D axisymmetric electromagnetic modeling of HTS coils based on T-A formulation with modified Newman boundary conditions","authors":"Yong Chen, Qiuliang Wang, Kangshuai Wang, Benzhe Zhou, Shixian Liu, Xiaoyu Ji, Lei Wang, Jianhua Liu","doi":"10.1088/1361-6668/ad6718","DOIUrl":"https://doi.org/10.1088/1361-6668/ad6718","url":null,"abstract":"\u0000 The T-A formulation based on thin film approximation has been widely used in electromagnetic modeling of high temperature superconducting (HTS) coated conductors (CCs). However, with the emergence of no-insulation (NI) HTS coils and its variant HTS coils, the electrical connection of HTS coils has become increasingly complex, and the traditional T-A formulation is challenging to handle the problems of conductors with non-negligible thickness and current sharing. This paper firstly describes the Neumann boundary condition of the T-A formulation under 2D axisymmetric symmetry in detail, as well as the conversion of different boundary conditions. And additional voltage variable is added to correct the Newman boundary condition from the perspective of circuit. Then, considering HTS CCs series or parallel stacking to carry current, the effectiveness of this method is verified by comparing with benchmark model. Finally, we extend the application range of the T-A formulation with modified Newman boundary conditions to simulate thick superconductors, and naturally process current sharing of azimuthal and radial current in circular NI HTS coils.","PeriodicalId":21985,"journal":{"name":"Superconductor Science and Technology","volume":"37 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141810292","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

Topological insulator based axial superconducting quantum interferometer structures 基于拓扑绝缘体的轴向超导量子干涉仪结构

Superconductor Science and Technology Pub Date : 2024-07-23 DOI: 10.1088/1361-6668/ad637d

Erik Zimmermann, Abdur Rehman Jalil, Michael Schleenvoigt, Jan Karthein, Benedikt Frohn, Gerrit Behner, Florian Lentz, Stefan Trellenkamp, Elmar Neumann, Peter Schüffelgen, Hans Lüth, Detlev Grützmacher and Thomas Schäpers

引用次数: 0

Error analysis for determining transverse tensile delamination strength of REBCO coated conductors by anvil test: numerical simulation demonstrations 通过砧板试验确定 REBCO 涂层导体横向拉伸分层强度的误差分析：数值模拟演示

Superconductor Science and Technology Pub Date : 2024-07-22 DOI: 10.1088/1361-6668/ad663f

Peifeng Gao, Yameng Zhang, Xiaohui Lin, Sikan Chen, Jiamin Zhu, M. Guan, Xingzhe Wang

{"title":"Error analysis for determining transverse tensile delamination strength of REBCO coated conductors by anvil test: numerical simulation demonstrations","authors":"Peifeng Gao, Yameng Zhang, Xiaohui Lin, Sikan Chen, Jiamin Zhu, M. Guan, Xingzhe Wang","doi":"10.1088/1361-6668/ad663f","DOIUrl":"https://doi.org/10.1088/1361-6668/ad663f","url":null,"abstract":"\u0000 RE-Ba-Cu-O (REBCO, where RE = Y, Gd, Sm, and other rare earth elements) coated conductor (CC) tapes exhibit considerable potential for application within the domains of high-energy physics and high-field science. Nevertheless, weak interfacial properties pose a significant obstacle, impeding the progress and practical implementation in high-field scenarios. The anvil tension method has been extensively employed for the assessment of transverse delamination strength of REBCO CC tapes. However, the outcomes derived from anvil tension exhibit severe dispersion, thereby impeding its efficacy in evaluating material performance. The underlying cause of this phenomenon remains unidentified. In this study, error analysis of anvil measurement method in determining the transverse tensile delamination strength (TTDS) of REBCO CC tapes was conducted based on finite element (FE) numerical simulations. A two-dimensional multilayer elastic-plastic delamination FE model with main layers of REBCO CC tapes, solder connecting layers and anvil materials were developed based on the bilinear cohesive zone model. The effects of anvil test conditions and the structural configuration of the conductor itself on the test results were discussed. Simulation results show that localized premature cracking of the interface due to stress concentration and plastic yielding of the CC tape around the loading boundary is the root reason for the discrepancy between the anvil test results and the true interfacial strength. Therefore, anvil test conditions (including top anvil dimensions, soldering conditions, loading eccentricity angle, and anvil material properties) as well as the structural configuration of the conductor itself (including edge initial crack length, edge encapsulation width, and stabilizer thickness) have a significant impact on anvil test-based TTDS results.","PeriodicalId":21985,"journal":{"name":"Superconductor Science and Technology","volume":"16 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141815532","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

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

引用次数: 0

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

引用次数: 0

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}

引用次数: 0

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

引用次数: 0