Physica C-superconductivity and Its Applications最新文献

The fabrication of graphene supported Ni nanoparticles and its doping influence on the microstructure and superconductivity of MgB2 石墨烯支撑镍纳米粒子的制备及其对 MgB2 微观结构和超导性的掺杂影响

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-11-09 DOI: 10.1016/j.physc.2024.1354615

Qian Zhao , Shilong Ma , Guoqing Xia , Jiabo Zhang , Yaran Zhang

{"title":"The fabrication of graphene supported Ni nanoparticles and its doping influence on the microstructure and superconductivity of MgB2","authors":"Qian Zhao , Shilong Ma , Guoqing Xia , Jiabo Zhang , Yaran Zhang","doi":"10.1016/j.physc.2024.1354615","DOIUrl":"10.1016/j.physc.2024.1354615","url":null,"abstract":"<div><div>A highly dispersed Ni nanoparticle supported on a graphene matrix (nano-Ni/G) has been successfully synthesized using a novel chemical reduction process to overcome agglomeration in traditional MgB<sub>2</sub> preparation methods. The influence of the reduction technique on nanoparticle size and structure was thoroughly investigated using a model system. The resulting nanoparticles were small enough (10 nm) to decorate the 2D graphene layers as sandwich structures. This unique morphology contributes to providing more effective flux pinning centers by forming tiny MgNi<sub>2.5</sub>B<sub>2</sub> and efficiently substituting C for B in MgB<sub>2</sub> bulks through the principle of double action. Moreover, the low-melting eutectic liquid formed by Mg-Ni at 506 °C is beneficial for the fast fabrication of well-connected MgB<sub>2</sub> at low temperatures. Furthermore, a small enhancement of critical current density (<em>J<sub>c</sub></em>) was observed in the doped sample with respect to the undoped ones. However, the advantages of the as-prepared nanoparticles were greatly suppressed by the large presence of MgO during the deposition process, leading to lower superconducting performance than undoped MgB<sub>2</sub> bulks. Based on the analysis, further investigation should focus on inducing more flux pinning centers by controlling impurities during the deposition process for achieving optimal performance.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"627 ","pages":"Article 1354615"},"PeriodicalIF":1.3,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142651138","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

Spin fluctuations in conventional superconductors and anomalous isotope effect in PdH and PdD 传统超导体中的自旋波动以及 PdH 和 PdD 中的异常同位素效应

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-10-30 DOI: 10.1016/j.physc.2024.1354602

J. Rivera, A. Rubio-Ponce

{"title":"Spin fluctuations in conventional superconductors and anomalous isotope effect in PdH and PdD","authors":"J. Rivera, A. Rubio-Ponce","doi":"10.1016/j.physc.2024.1354602","DOIUrl":"10.1016/j.physc.2024.1354602","url":null,"abstract":"<div><div>Spin fluctuations have been suggested to be an influence to the superconducting phenomenon, either favorably or disruptively. Consequently, we study the role of magnons in the thermodynamics of conventional superconductors proposing a relationship between magnetization and electron-magnon coupling (<span><math><msub><mrow><mi>λ</mi></mrow><mrow><mi>e</mi><mi>m</mi></mrow></msub></math></span>) for vanadium, niobium, lead, palladium, and the PdX (where <span><math><mrow><mi>X</mi><mo>=</mo></mrow></math></span> hydrogen, deuterium, and tritium) systems. We suggest a different relationship for the Coulomb pseudopotential (<span><math><msubsup><mrow><mi>μ</mi></mrow><mrow><mi>N</mi></mrow><mrow><mo>∗</mo></mrow></msubsup></math></span>), which is influenced by the characteristic frequency (<span><math><msub><mrow><mi>ω</mi></mrow><mrow><mo>ln</mo></mrow></msub></math></span>). In this way, the critical temperatures (<span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>) of the elements studied and the PdX compounds are very close to those reported experimentally. The PdH, PdD and PdT compounds have shown critical temperatures of 9.05 K, 12.20 K and 12.90 K, respectively. Finally, we determine the behavior of <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> for PdX under hydrostatic pressures up to 10 GPa, showing an alternative explanation for the anomalous isotope effect in PdH and PdD compounds. Our study was carried out by numerically solving the linearized Migdal-Eliashberg equations coupling the Bogoliubov-de-Gennes method, while the magnetic excitation was calculated using linear response time dependent within the Density Functional Theory, framework, both implemented in the Elk code.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"627 ","pages":"Article 1354602"},"PeriodicalIF":1.3,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554182","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

Theoretical calculation and analysis of electromagnetic performance of high temperature superconducting electric flywheel energy storage system 高温超导电动飞轮储能系统电磁性能的理论计算与分析

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-10-29 DOI: 10.1016/j.physc.2024.1354599

Deming Huang, Chaoqun Jiao, Jin Fang

引用次数: 0

Electro-thermal dynamics in superconducting generators: An In-Depth investigation of AC losses and cooling techniques for a 10 MW rotor coil system 超导发电机的电热动力学：深入研究 10 兆瓦转子线圈系统的交流损耗和冷却技术

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-10-29 DOI: 10.1016/j.physc.2024.1354588

A. Erciyas , Ş. Yildiz , F. Inanir

{"title":"Electro-thermal dynamics in superconducting generators: An In-Depth investigation of AC losses and cooling techniques for a 10 MW rotor coil system","authors":"A. Erciyas , Ş. Yildiz , F. Inanir","doi":"10.1016/j.physc.2024.1354588","DOIUrl":"10.1016/j.physc.2024.1354588","url":null,"abstract":"<div><div>In the pursuit of optimizing superconducting generator systems, a comprehensive understanding of their electro-thermal behaviors is crucial. This study builds upon previous research on an 8-pole, 10 MW superconducting generator by Inanir et al. (2022, Journal of Superconductivity and Novel Magnetism, 35(11), 3189) and focuses on an in-depth electro-thermal analysis of the rotor coil system. The emphasis is on assessing the AC losses experienced during transitory current changes. By simultaneously solving Ampere's equation and the heat conduction equation under specific boundary conditions, the research provides a detailed insight into the interaction between electrical and thermal dynamics within the rotor coils. The paper highlights the importance of temperature dynamics in various cooling and current conditions. The results demonstrate that achieving an optimal balance in cooling, particularly with the use of liquid nitrogen, is critical for efficient operation. This study not only advances the understanding of superconducting generators but also highlights potential strategies for improving their reliability and efficiency.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"626 ","pages":"Article 1354588"},"PeriodicalIF":1.3,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538446","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

Investigation of the energizing characteristics of a metal-insulation iron-based superconducting coil 金属绝缘铁基超导线圈的通电特性研究

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-10-29 DOI: 10.1016/j.physc.2024.1354603

Hangwei Ding , Lei Yu , Jianyuan Xu , Pengcheng Huang , Zhiyou Chen , Dongliang Wang , Xianping Zhang , Wenge Chen , Yanwei Ma

{"title":"Investigation of the energizing characteristics of a metal-insulation iron-based superconducting coil","authors":"Hangwei Ding , Lei Yu , Jianyuan Xu , Pengcheng Huang , Zhiyou Chen , Dongliang Wang , Xianping Zhang , Wenge Chen , Yanwei Ma","doi":"10.1016/j.physc.2024.1354603","DOIUrl":"10.1016/j.physc.2024.1354603","url":null,"abstract":"<div><div>With the progress of iron-based superconducting wire and tape fabrication technologies, extensive research has been conducted on iron-based superconducting coils. A deep understanding of the energizing characteristics of these coils is crucial for their large-scale application. This study investigates two metal-insulated double pancake coils, each having a different number of turns and co-wound with Ba<sub>0.6</sub>K<sub>0.4</sub>Fe<sub>2</sub>As<sub>2</sub> iron-based superconducting tape and stainless-steel tape. We conducted critical current tests, sudden-discharge experiments, and charge-discharge cycles at 4.2 K to obtain the time constants and characteristic resistances of the coils. Additionally, the impact of stainless-steel as co-wound material on coil performance was analyzed. Theoretical models were employed to calculate the charging processes and validate them against experimental results. This research offers valuable insights for the practical application of iron-based superconducting materials.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"626 ","pages":"Article 1354603"},"PeriodicalIF":1.3,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538448","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

Influence of ReBCO tape winding mode on the magnetization loss of CORC cable under the shielding current effect 屏蔽电流效应下 ReBCO 带缠绕模式对 CORC 电缆磁化损耗的影响

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-10-29 DOI: 10.1016/j.physc.2024.1354597

Wenhai Zhou, Rongli Jia , Bingxu Su , Bin Wang

{"title":"Influence of ReBCO tape winding mode on the magnetization loss of CORC cable under the shielding current effect","authors":"Wenhai Zhou, Rongli Jia , Bingxu Su , Bin Wang","doi":"10.1016/j.physc.2024.1354597","DOIUrl":"10.1016/j.physc.2024.1354597","url":null,"abstract":"<div><div>Conductor on round core (CORC) cable is made of second-generation high-temperature superconducting (HTS) tapes wound in multi-layer spirals. It is the most promising HTS cable due to its simple preparation process, high current-carrying capacity and low AC loss. CORC cable has shielding currents that cause field errors and centre magnetic field drift during electromagnetic field loading. Additionally, small changes in the winding mode and winding angle of the tape will lead to changes in the current distribution on the ReBCO tape, which results in differences in AC loss. In this paper, the influence of shielding on the electromagnetic characteristics and central magnetic field of CORC cable is discussed, and the influence of different winding modes and angles on the magnetization loss is investigated. The results of the study show that the shielding current will cause magnetization loss, and the winding structure has a significant effect on these losses. Adjusting the winding angle can reduce the magnetization loss and improve the cable performance.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"626 ","pages":"Article 1354597"},"PeriodicalIF":1.3,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538438","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

Double-pancake superconducting coil integrated with DFIG-based wind power systems under voltage-dip events: Design and performance analysis study 电压跌落事件下与基于 DFIG 的风力发电系统集成的双饼超导线圈：设计和性能分析研究

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-10-29 DOI: 10.1016/j.physc.2024.1354601

Garkki B, Revathi S

{"title":"Double-pancake superconducting coil integrated with DFIG-based wind power systems under voltage-dip events: Design and performance analysis study","authors":"Garkki B, Revathi S","doi":"10.1016/j.physc.2024.1354601","DOIUrl":"10.1016/j.physc.2024.1354601","url":null,"abstract":"<div><div>The doubly fed induction generator (DFIG)-based wind turbine provides massive development in power generation. Uncertain power oscillations and voltage-dip events affect the stability of the DFIG. To mitigate the effect of voltage-dips in short period, superconducting magnetic energy storage (SMES), which possess rapid energy exchange and high power density, is integrated with large-scale renewable power systems. SMES is integrated at the DC link of the DFIG to ensure the power balance and fault ride-through (FRT) capability. During this operation, frequent current changes occur in the high-temperature superconducting (HTS) coil, which leads to an increase in AC losses. As a remedy, an additional power converter structure controlled with a model-predictive controller (MPC) is proposed. Firstly, a scale-down HTS double-pancake coil model is designed using a finite element model by which transport current loss and magnetic field formulation are studied. Additionally, the critical coil current is also verified through experimental studies. The effectiveness of the proposed MPC-based SMES integrated DFIG on DC link voltage and grid current under IEC-61000-4-11 standard, symmetrical and asymmetrical voltage-dip cases are investigated. The obtained results demonstrate that the proposed system effectively reduces transients in DC link voltage and improves the FRT capabilities of the grid.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"626 ","pages":"Article 1354601"},"PeriodicalIF":1.3,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538447","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

Preparation of double-layer REBa2Cu3O7−δ tapes for enhancing engineering current density by Ag-diffusion bonding 制备双层 REBa2Cu3O7-δ 带，利用银扩散键增强工程电流密度

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-10-29 DOI: 10.1016/j.physc.2024.1354598

Hao Dong , Daxing Huang , Hao Yu , Hongwei Gu , Fazhu Ding

{"title":"Preparation of double-layer REBa2Cu3O7−δ tapes for enhancing engineering current density by Ag-diffusion bonding","authors":"Hao Dong , Daxing Huang , Hao Yu , Hongwei Gu , Fazhu Ding","doi":"10.1016/j.physc.2024.1354598","DOIUrl":"10.1016/j.physc.2024.1354598","url":null,"abstract":"<div><div>Second-generation high-temperature superconducting (2G-HTS) tapes with high engineering critical current densities (<em>J</em><sub>e</sub>) are widely used in engineering and technology applications. This study introduced a twisting device that successfully layered two REBa<sub>2</sub>Cu<sub>3</sub>O<sub>7−</sub><em><sub>δ</sub></em> films onto a single substrate. Heating the twisting device to above 600 °C induced Ag-diffusion bonding at the interface between the two tapes. A thin film pressure sensor detected a silver layer pressure of about 6.5 MPa. After the oxygen annealing treatment, a current increase of 81.7 A was observed using the four-probe method, which was a 1.5-fold enhancement over the original tape current, and the <em>J</em><sub>e</sub> was increased from 560 A/mm<sup>2</sup> to 790 A/mm<sup>2</sup> at 77 K. The use of reverse bending annealing effectively improved the flexibility of the DHOS conductors. Through microanalysis, it was observed that the bonding between MgO and Y<sub>2</sub>O<sub>3</sub> in the buffer layer was weak, resulting in the detachment of LaMnO<sub>3</sub> and MgO together with the superconducting layer. The exfoliated buffer layer prevented oxygen penetration, adversely affecting the performance of the double HTS layers on one substrate (DHOS). Moreover, the coverage of the buffer layer increases with the number of layers complicating the complete peeling of the superconducting layer. Further detailed studies point out the direction of improvement for future work in preparing multilayer conductors.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"626 ","pages":"Article 1354598"},"PeriodicalIF":1.3,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538439","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 optimization of a hybrid toroidal magnet for 10 MJ HTS SMES system 用于 10 兆焦耳 HTS SMES 系统的混合环形磁体的电磁优化

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-10-29 DOI: 10.1016/j.physc.2024.1354589

Wenxu Liu , Shaotao Dai , Tao Ma , Yangyang Shi , Meng Song

引用次数: 0

Design and development of dual-band superconducting filter with a novel structure 设计和开发具有新型结构的双频超导滤波器

IF 1.3 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-10-28 DOI: 10.1016/j.physc.2024.1354605

Xin Yan , Qi Chen , Laiyun Ji

引用次数: 0