SuperconductivityPub Date : 2024-04-19DOI: 10.1016/j.supcon.2024.100096
Yuting Jiang , Xingyu Zhang , Hui Zhou , Xiaofu Zhang , Hao Li , Lixing You
{"title":"Superconducting nanostrip single photon detectors fabricated of aluminum thin-films","authors":"Yuting Jiang , Xingyu Zhang , Hui Zhou , Xiaofu Zhang , Hao Li , Lixing You","doi":"10.1016/j.supcon.2024.100096","DOIUrl":"10.1016/j.supcon.2024.100096","url":null,"abstract":"<div><p>We systematically investigated the detection performance of Al nanostrips for single photons at various wavelengths. The Al films were deposited using magnetron sputtering, and the sophisticated nanostructures and morphology of the deposited films were revealed through high-resolution transmission electron microscopy. The fabricated Al meander nanostrips, with a thickness of 4.2 nm and a width of 178 nm, exhibited a superconducting transition temperature of 2.4 K and a critical current of approximately 5 μA at 0.85 K. While the Al nanostrips demonstrated a saturated internal quantum efficiency for 405-nm photons, the internal detection efficiency exhibited an exponential dependence on bias current without any saturation tendency for 1550-nm photons. This behavior can be attributed to the relatively large diffusion coefficient and coherence length of the Al films. By further narrowing the nanostrip width, the Al-SNSPDs remain capable of effectively detecting single telecom photons to facilitate practical applications.</p></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"10 ","pages":"Article 100096"},"PeriodicalIF":0.0,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772830724000139/pdfft?md5=cc4de4e35457f3c41620e11c070c4e76&pid=1-s2.0-S2772830724000139-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140777496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Numerical modelling of electromechanical coupling behaviors in HTS coil with implementation of H formulation in FE software","authors":"Huadong Yong , Dong Wei , Yunkai Tang , Donghui Liu","doi":"10.1016/j.supcon.2024.100097","DOIUrl":"10.1016/j.supcon.2024.100097","url":null,"abstract":"<div><p>(Re)Ba<sub>2</sub>Cu<sub>3</sub>O<sub>7-x</sub> (REBCO) coated conductors (CCs) have attracted considerable concern because of their outstanding current carrying capacity in magnetic fields of high strengths. A huge electromagnetic force is generated in the superconducting coil when conducting large currents in strong magnetic field. Thus, management of stress and strain has become a key technical challenge for the stability and safety of superconducting coil during operation. To accurately predict the electro-magnetic and mechanical characteristics of superconducting coil in strong magnetic field, an electromechanical model on the basis of the H-formulation and arbitrary Lagrangian-Eulerian (ALE) method is proposed here with FE software. To verify the proposed model, the simulation outcomes of the coil during magnetization are compared with the experimental outcomes. The coupling effect of magnet at high field strengths is dependent on the position of the coil. To reduce the screening current effect, the overshoot method with plateau is found superior to the traditional overshoot method, and an increase in the stabilization time can decrease the maximum value of stress. Finally, the electromechanical behaviors of single winding coil and two-tapes co-winding coil are compared.</p></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"10 ","pages":"Article 100097"},"PeriodicalIF":0.0,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772830724000140/pdfft?md5=f0be644092e97573b6237099e2f8dee3&pid=1-s2.0-S2772830724000140-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140783356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
SuperconductivityPub Date : 2024-04-13DOI: 10.1016/j.supcon.2024.100095
Yue Wu , Shuangrong You , Jin Fang , Rodney A. Badcock , Nicholas J. Long , Zhenan Jiang
{"title":"AC loss study on a 3-phase HTS 1 MVA transformer coupled with a three-limb iron core","authors":"Yue Wu , Shuangrong You , Jin Fang , Rodney A. Badcock , Nicholas J. Long , Zhenan Jiang","doi":"10.1016/j.supcon.2024.100095","DOIUrl":"10.1016/j.supcon.2024.100095","url":null,"abstract":"<div><p>High-temperature superconducting (HTS) technology provides an alternative approach to achieve compact transformers. Addressing AC loss in the HTS winding is crucial for HTS transformer applications. Most numerical AC loss studies on HTS transformers have neglected the influence of iron cores. This work carries out an AC loss study to explore the impact of an iron core on the HTS windings in a 3-phase HTS 1 MVA transformer coupled with it. AC loss simulations for the transformer winding both with and without the iron core are conducted by adopting the three-dimensional (3D) <em>T</em>-<em>A</em> homogenization method. When the iron core is incorporated, the saturation magnetic fields of iron materials, flux diverters (FDs) with different geometries, and variations in turn spacings in the LV winding composed of Roebel cables are considered to investigate their influence on the AC loss of the transformer winding. The inclusion of the iron core leads to a 1.2% increase in AC loss for the transformer winding while simulating at the rated current. We attribute this slight difference to the non-inductive winding structure of the transformer winding, where a strong magnetic field generated in the space between the LV and HV windings effectively shields the influence of the iron core.</p></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"10 ","pages":"Article 100095"},"PeriodicalIF":0.0,"publicationDate":"2024-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772830724000127/pdfft?md5=40e0c580771e6c6ccb0192cb0e47602f&pid=1-s2.0-S2772830724000127-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140763232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
SuperconductivityPub Date : 2024-03-01DOI: 10.1016/j.supcon.2024.100087
Alok K. Jha , Kaname Matsumoto , Tomoya Horide , Shrikant Saini , Ataru Ichinose , Paolo Mele , Yutaka Yoshida , Satoshi Awaji
{"title":"Evaluation of temperature dependent vortex pinning properties in strongly pinned YBa2Cu3O7-δ thin films with Y2BaCuO5 nanoinclusions","authors":"Alok K. Jha , Kaname Matsumoto , Tomoya Horide , Shrikant Saini , Ataru Ichinose , Paolo Mele , Yutaka Yoshida , Satoshi Awaji","doi":"10.1016/j.supcon.2024.100087","DOIUrl":"10.1016/j.supcon.2024.100087","url":null,"abstract":"<div><p>The pinning of quantized magnetic vortices in superconducting YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7- δ</sub>(YBCO or Y123) thin films with Y<sub>2</sub>BaCuO<sub>5</sub> (Y211) nanoinclusions have been investigated over wide temperature range (4.2–77 K). The concentration of Y211 nanoinclusions has been systematically varied inside YBCO thin films prepared by laser ablation technique using surface modified target approach. Large pinning force density values (<em>F<sub>p</sub></em> ∼ 0.5 TNm<sup>−3</sup> at 4.2 K, 9 T) have been observed for the YBCO film with moderate concentration of Y211 nanoinclusions (3.6 area % on ablation target). In addition, uniform enhancement in critical current density (<em>J<sub>c</sub></em>) was observed in the angular dependent <em>J<sub>c</sub></em> measurement of YBCO+Y211 nanocomposite films. Y211 nanoinclusions have been found to be very efficient in pinning the quantized vortices thereby enhancing the in-field <em>J<sub>c</sub></em> values over a wide range of temperature. Increasing the concentration of Y211 secondary phase into Y123 film matrix results into agglomeration of Y211 phase and observed as increased Y211 nanoparticle size. These larger secondary phase nanoparticles are not as efficient pinning centers at lower temperatures as they are at higher temperatures due to substantial reduction of the coherence length at lower temperatures. Investigation of the temperature dependence of <em>J<sub>c</sub></em> for YBCO+Y211 nanocomposite films has been conducted and possible vortex pinning mechanism in these nanocomposite films has been discussed.</p></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"9 ","pages":"Article 100087"},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772830724000048/pdfft?md5=c63fad2986ec80f2d03dce6ca73ec113&pid=1-s2.0-S2772830724000048-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139966173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
SuperconductivityPub Date : 2024-02-19DOI: 10.1016/j.supcon.2024.100086
J.V.J. Congreve, Y. Shi, A.R. Dennis, H. Druiff, N.C. Tutt, D.A. Cardwell, J.H. Durrell
{"title":"A detailed comparison of the composition of (RE)-Ba-Cu-O-Ag bulk superconductors","authors":"J.V.J. Congreve, Y. Shi, A.R. Dennis, H. Druiff, N.C. Tutt, D.A. Cardwell, J.H. Durrell","doi":"10.1016/j.supcon.2024.100086","DOIUrl":"https://doi.org/10.1016/j.supcon.2024.100086","url":null,"abstract":"<div><p>The homogeneity of the microstructure and composition are critical in determining the properties of rare earth-barium-cuprate, single grain bulk superconductors [(RE)BCO]. The magnitude of the trapped magnetic field achieveable in these technologically important materials, in particular, is influenced heavily by the size and distribution of (RE)<sub>2</sub>BaCuO<sub>x</sub> (RE-211) flux pinning inclusions in the bulk microstructure, whereas the size and distribution of silver agglomerates present within the bulk superconducting matrix correlate directly with improved mechanical properties. With careful engineering, these materials have significant potential for application in range of devices related to energy storage, medicine, electro-magnetic machinery and microelectronic technology. Fabrication of (RE)BCO bulk superconductors typically involves heating a powder compact above its peritectic decomposition temperature followed by slow cooling to facilitate the growth of a single grain. Each (RE)BCO composition has a different peritectic temperature and growth rate, which, therefore, necessitates different requirements in the heating profile. The fabrication temperature and growth rate, for example, may have an effect on the RE-211 and silver distribution, which may, in turn, affect the superconducting properties of the resulting single grain.</p><p>In this work we compare the distributions of silver and RE-211 in the single grain microstructures of YBCO-Ag, GdBCO-Ag, EuBCO-Ag and SmBCO-Ag bulk superconductors using optical microscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy. We observe that the distributions are very similar along both the <em>a/b</em>-axis and <em>c</em>-axis of these materials. This suggests that factors other than the maximum temperature used to achieve peritectic decomposition and the rate of single grain growth are particularly influential in determining the properties of the as-processed samples in the top seeded melt growth process. This observation demonstrates there is freedom to use (RE) materials interchangeably between different applications as required, for example, for functional or economic reasons.</p></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"9 ","pages":"Article 100086"},"PeriodicalIF":0.0,"publicationDate":"2024-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772830724000036/pdfft?md5=311e47672fc92a9785ac758263697954&pid=1-s2.0-S2772830724000036-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139976111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
SuperconductivityPub Date : 2024-02-03DOI: 10.1016/j.supcon.2024.100085
Alireza Sadeghi, Shahin Alipour Bonab, Wenjuan Song, Mohammad Yazdani-Asrami
{"title":"Short circuit analysis of a fault-tolerant current-limiting high temperature superconducting transformer in a power system in presence of distributed generations","authors":"Alireza Sadeghi, Shahin Alipour Bonab, Wenjuan Song, Mohammad Yazdani-Asrami","doi":"10.1016/j.supcon.2024.100085","DOIUrl":"https://doi.org/10.1016/j.supcon.2024.100085","url":null,"abstract":"<div><p>Power transformers are key elements for the safe and reliable delivery of electrical energy generated by renewable energy resources to consumers via transmission lines. Fault-tolerant current-limiting High Temperature Superconducting (FTCL HTS) transformers are type of superconducting transformers that tolerate fault for seconds and limit the fault current without the threat of burnout or delamination of tapes and deformation of windings. In this paper, the fault performance of a FTCL HTS transformer in a standard IEEE power system is investigated. The studied transformer is a 50 MVA 132 kV/13.8 kV transformer where both windings are made up of HTS tapes. The understudied power system consists of two microgrids with distributed generators. Part of the power in microgrids is supplied by the upstream grid which is connected to the microgrids through the HTS transformers. Two fault scenarios have been considered in this power system, in each one of these scenarios, a fault happens in one of the microgrids. Two considered fault scenarios have an approximate fault current of 18x to 23x of the rated current in the secondary windings. Results showed that insulated windings in FTCL HTS transformers could substantially reduce the peak temperature of the HTS windings, compared to bare windings. Afterwards, post-fault loading is imposed on the HTS windings, to observe their performance against the current increase after fault clearance. In this case, for the first scenario of the faults, the FTCL HTS transformer could tolerate 192% of post-fault overloading, while this number for the second fault scenario is 170%. Finally, the impact of post-fault loading on the full recovery time was discussed.</p></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"9 ","pages":"Article 100085"},"PeriodicalIF":0.0,"publicationDate":"2024-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772830724000024/pdfft?md5=0739bbd85ac438df78e7d50904a2bc05&pid=1-s2.0-S2772830724000024-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139744291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
SuperconductivityPub Date : 2024-01-04DOI: 10.1016/j.supcon.2024.100084
Li Lu , Wei Wu , Xin Yu , Zhuoyan Zhong , Kai Li , Chengyun Pan , Mengzhu Li , Zhijian Jin
{"title":"Method with reliable accuracy and fast speed for measuring operational current of HTS NI closed-loop coils in steady persistent-current-mode","authors":"Li Lu , Wei Wu , Xin Yu , Zhuoyan Zhong , Kai Li , Chengyun Pan , Mengzhu Li , Zhijian Jin","doi":"10.1016/j.supcon.2024.100084","DOIUrl":"10.1016/j.supcon.2024.100084","url":null,"abstract":"<div><p>This study proposes a method for measuring the operational current of high temperature superconducting (HTS) non-insulation (NI) closed-loop coils, which operate in the steady persistent-current-mode (PCM). HTS NI closed-loop coils are promising for many easily-quenching direct-current (DC) applications, where their performance is determined by magnetomotive forces, total number of turns, and dimensions. As the primary interface parameter in an application system, the operational current must be accurately and rapidly measured. Generally, this is achieved by dividing the measured magnetic field by the coil constant. However, even if the influence of the screening current induced field (SCIF) is not considered, existing methods for the coil constant may be disturbed by the performance and location of Hall sensors, or experience a long measuring period. Therefore, a relatively accurate and fast method is proposed in this study, which is based on adjusting the output current of the adjustable power supply and monitoring the coil voltage as an indicator. The proposed method was validated through experiments and simulations using an equivalent circuit model coupled with a finite element method (FEM) model, and its current accuracy can be equivalent to the resolution of the employed power supply. It was demonstrated that this method reduced the requirements for Hall sensor’s performance and location, and has a more reliable accuracy in contrast to the simulation method. Compared to the experimentally conventional method, the proposed method presents a significantly faster speed. The impact of the SCIF was considered and proven to be negligible for the tested pancake coils. Even for coils whose coil constant vibrates owing to the SCIF, this method can be adapted to directly measure various operational currents. Furthermore, it was demonstrated that the measurement error can be influenced by the current discrepancy among turns when the coil is not in the steady PCM, and a procedure for reducing this error was proposed.</p></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"9 ","pages":"Article 100084"},"PeriodicalIF":0.0,"publicationDate":"2024-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772830724000012/pdfft?md5=757d78df261995052a2978d6aeb0bdcc&pid=1-s2.0-S2772830724000012-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139394828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"40-meter-long REBCO tapes with critical current over 4,000 A/12 mm at 4.2 K and 13 T by advanced MOCVD","authors":"Mahesh Paidpilli , Chirag Goel , Bhabesh Sarangi , Siwei Chen , Eduard Galstyan , Jan Jaroszynski , Griffin Bradford , Dmytro Abraimov , Venkat Selvamanickam","doi":"10.1016/j.supcon.2023.100081","DOIUrl":"10.1016/j.supcon.2023.100081","url":null,"abstract":"<div><p>REBa<sub>2</sub>Cu<sub>3</sub>O<sub>7−δ</sub> (REBCO, RE = rare earth) tapes doped with 5% and 15% Zr have been scaled up to lengths more than 40 m in a pilot-scale advanced metal organic chemical vapor deposition (A-MOCVD) tool<em>.</em> The precursor compositions used for the long tapes were guided by a study of the influence of (Ba + dopant)/Cu content on the critical current density (<em>J<sub>c</sub></em>) of 5 and 15 mol.% Hf- and Zr-added tapes at 4.2 K and 13 T. The 40-m-long tapes exhibited a critical current (<em>I<sub>c</sub></em>) over 4,000 A/12 mm at 4.2 K and 13 T as well as over 1,400 A/12 mm at 20 K and 20 T. The critical current densities of a 40-m-long tape doped with 5% Zr at 4.2 K measured at the National High Magnetic Field Laboratory (NHMFL) were > 10 MAcm<sup>−2</sup> and >5 MAcm<sup>−2</sup> at 14 T and 30 T, respectively, which are over three times those of commercial REBCO tapes. The infield <em>J<sub>c</sub></em> of 5% Zr-added 40-m-long tapes was similar to those of previously-reported high-performance short samples made with 15% Zr or Hf. These results demonstrate the excellent potential of A-MOCVD for manufacturing high <em>I<sub>c</sub></em> REBCO tapes for use in ultrahigh-field magnet applications.</p></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"9 ","pages":"Article 100081"},"PeriodicalIF":0.0,"publicationDate":"2023-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772830723000467/pdfft?md5=68567b29316d49e6d356ab3cbd87f05b&pid=1-s2.0-S2772830723000467-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139018265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
SuperconductivityPub Date : 2023-12-16DOI: 10.1016/j.supcon.2023.100083
Fabiano Carvalho de Castro Sene
{"title":"Review on the state-of-the-art and challenges in the MgB2 component manufacturing for superconducting applications","authors":"Fabiano Carvalho de Castro Sene","doi":"10.1016/j.supcon.2023.100083","DOIUrl":"10.1016/j.supcon.2023.100083","url":null,"abstract":"<div><p>Since the discovery of MgB<sub>2</sub> as a superconductor, several research groups worldwide have studied the superconducting mechanisms due to the dual gap nature of MgB<sub>2</sub>, as well as attempted to produce such a compound in wires, tapes, bulks, and thin films for a plethora of applications. While MgB<sub>2</sub> carries the promise of replacing Niobium-based superconductors in low-field applications, less-than-desirable performance and in-operation stability has slowed down such a progress. While the properties and nature of the superconductivity of MgB<sub>2</sub> are fairly known, the reproduction of its properties at manufacturing scales remains an unsolved problem. Therefore, this manuscript presents a systematic review on fundamental properties, phase formation, growth kinetics, and superconducting properties of MgB<sub>2</sub>-based components such as multi- and mono-core wires, bulks, and thin films. Advances, challenges, and shortcomings are utilized in consolidating research questions and directions pertaining to the manufacturing of MgB<sub>2</sub> superconducting devices. Lastly, we evaluate the technological readiness of MgB<sub>2</sub>-based devices for applications in fusion energy systems.</p></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"9 ","pages":"Article 100083"},"PeriodicalIF":0.0,"publicationDate":"2023-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772830723000480/pdfft?md5=fc76e82b2c42ae3bc236ba7e3682f3fb&pid=1-s2.0-S2772830723000480-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139018297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
SuperconductivityPub Date : 2023-12-16DOI: 10.1016/j.supcon.2023.100082
Yufan Yan , Donghui Jiang , Peng Song , Jeonghwan Park , Seungyong Hahn , Yunfei Tan , Timing Qu
{"title":"Screening-current-induced magnetic fields and strains in a compact REBCO coil in self field and background field","authors":"Yufan Yan , Donghui Jiang , Peng Song , Jeonghwan Park , Seungyong Hahn , Yunfei Tan , Timing Qu","doi":"10.1016/j.supcon.2023.100082","DOIUrl":"10.1016/j.supcon.2023.100082","url":null,"abstract":"<div><p>REBa<sub>2</sub>Cu<sub>3</sub>O<sub>7−</sub><em><sub>x</sub></em> (REBCO) coated conductors, owing to its high tensile strength and current-carrying ability in a background field, are widely regarded a promising candidate in high-field applications. Despite the great potentials, recent studies have highlighted the challenges posed by screening currents, which are featured by a highly nonuniform current distribution in the superconducting layer. In this paper, we report a comprehensive study on the behaviors of screening currents in a compact REBCO coil, specifically the screening-current-induced magnetic fields and strains. Experiments were carried out in the self-generated magnetic field and a background field, respectively. In the self-field condition, the full hysteresis of the magnetic field was obtained by applying current sweeps with repeatedly reversed polarity, as the nominal center field reached 9.17 T with a maximum peak current of 350 A. In a background field of 23.15 T, the insert coil generated a center field of 4.17 T with an applied current of 170 A. Ultimately, a total center field of 32.58 T was achieved before quench. Both the sequential model and the coupled model considering the perpendicular field modification due to conductor deformation are applied. The comparative study shows that, for this coil, the electromagnetic–mechanical coupling plays a trivial role in self-field conditions up to 9 T. In contrast, with a high axial field dominated by the background field, the coupling effect has a stronger influence on the predicted current and strain distributions. Further discussions regarding the role of background field on the strains in the insert suggest potential design strategies to maximize the total center field.</p></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"9 ","pages":"Article 100082"},"PeriodicalIF":0.0,"publicationDate":"2023-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772830723000479/pdfft?md5=aa18d1d395434a3c0a7d6967e6ce67f7&pid=1-s2.0-S2772830723000479-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139014596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}