Physica C-superconductivity and Its Applications最新文献

{"title":"Influence of fluctuant external magnetic field on the lateral unrecoverable distance of HTS bulks","authors":"Ye Hong,&nbsp;Zhichuan Huang,&nbsp;Jun Zheng,&nbsp;Jiwang Zhang,&nbsp;Zigang Deng","doi":"10.1016/j.physc.2025.1354656","DOIUrl":"10.1016/j.physc.2025.1354656","url":null,"abstract":"<div><div>High temperature superconducting (HTS) maglev has great potential for high-speed rail transportation due to its non-contact nature, simple structure, and environmental benefits. The lateral stability of the HTS bulk superconductor is crucial for the curve negotiation ability of maglev trains running at high speeds. The HTS bulk can provide guidance for the maglev train without active control due to its unique magnetic flux pinning property. However, when passing through curves, it can deviate from its original position due to centrifugal effects and may not fully return to its original position. This deviation, known as the unrecoverable distance (UD), is closely related to the guidance performance of the maglev system. In this paper, the lateral UD of the HTS bulk is analyzed through lateral round-trip guidance force experiments using a customized HTS maglev dynamic measurement platform (SCML-03) with a circular permanent magnet guideway (PMG). The guidance force under different rotational speeds of the PMG was tested to study the effect of the fluctuation frequency of the external magnetic field. The influence of maximum lateral displacement (MLD), field cooling height (FCH), and working height (WH) on the UD of the HTS bulk are also discussed. The results showed that the rotational speed of the PMG has little effect on the dynamic guidance performance. The UD can be reduced by lowering the FCH and raising the WH appropriately. Additionally, methods should be found to restrain the possible MLD of levitated vehicles. This experimental analysis shows the lateral recoverable performance of the HTS bulk and provides a reference for the future design of the HTS maglev train.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"630 ","pages":"Article 1354656"},"PeriodicalIF":1.3,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143103658","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}

{"title":"Microstructure and superconducting property research of Cu-Mg reinforcing graphene and grain refining MgB2 by carbon-contained substances doping","authors":"Wenbin Jin ,&nbsp;Nan Liu ,&nbsp;Fang Cheng ,&nbsp;Zongqing Ma ,&nbsp;Yongchang Liu ,&nbsp;Pingzhan Si ,&nbsp;Hongliang Ge","doi":"10.1016/j.physc.2024.1354632","DOIUrl":"10.1016/j.physc.2024.1354632","url":null,"abstract":"<div><div>We report the C substitution effects in MgB₂ bulks on the lattice parameters, FWHM, and critical current density (<em>J_c</em>) as a function of doping level. It is shown that using carbon-coated boron powder can effectively control the grain growth of MgB₂ during the whole sintering process. Accompanied by the rapid cooling process, the final average grain size can be restrained within merely 50 nm, and the <em>J_c</em> value of the sample can be significantly improved at high field. On top of that, adding Cu is also considered a key factor in improving the current carrying property of the graphene-doped sample throughout the whole field, which can be attributed to the formation of the MgCu₂ alloy phase.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"628 ","pages":"Article 1354632"},"PeriodicalIF":1.3,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135442","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}

{"title":"Development of a 3 T cryogenic probe station with a 5.5 T superconducting magnet","authors":"Donghu Wang ,&nbsp;Zhan Zhang ,&nbsp;Zuoguang Li ,&nbsp;Peng Gao ,&nbsp;Pengfei Bai ,&nbsp;Rongtian Zhu ,&nbsp;Lian Zhang ,&nbsp;Guangdong Li ,&nbsp;Ze Wu ,&nbsp;Chao Zhou","doi":"10.1016/j.physc.2024.1354631","DOIUrl":"10.1016/j.physc.2024.1354631","url":null,"abstract":"<div><div>Cryogenic Probe Stations (CPSs) with superconducting magnetics can be used to investigate the magnetic properties of materials and devices at low temperatures, offering researchers valuable information about their behavior under strong magnetic fields. This article presented the design, development, and testing of superconducting CPS with conduction cooling cryostat. A Gifford-McMahon (G-M) cryocooler is used to cool the magnet with a power of 1.2 W. Utilizing a Nb-Ti superconducting magnet, this system is capable of reaching a maximum magnetic field strength of 5.5 T and a magnetic field strength of 3 T on the sample stage. The authors introduced the design of cryostat and the binary current leads. Thermal finite element simulation analysis was conducted on critical structures to verify the feasibility of the design of the cryostat.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"628 ","pages":"Article 1354631"},"PeriodicalIF":1.3,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135441","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}

{"title":"Characterization of damage in REBCO tapes for joint-less 2G-HTS magnets during mechanical slitting","authors":"Hao Dong ,&nbsp;Daxing Huang ,&nbsp;Hao Yu ,&nbsp;Hongwei Gu ,&nbsp;Fazhu Ding","doi":"10.1016/j.physc.2024.1354629","DOIUrl":"10.1016/j.physc.2024.1354629","url":null,"abstract":"<div><div>Joint-less magnets made from REBa₂Cu₃O₇₋<em>_δ</em> (REBCO) tapes have the potential to generate stable magnetic fields due to their closed-loop advantages, making them promising for applications in magnetic resonance imaging (MRI) and nuclear magnetic resonance (NMR) fields. This paper improves the method for mechanically slitting joint-less tapes and provides a detailed study of the microscopic effects at the edges and endpoints under varying slitting pressures. The research examines the impact of different slitting pressures and laser slitting on the Ag layer, superconducting layer, and buffer layer of REBCO tapes. Microscopic observations reveal that damage is more pronounced at the endpoints than at the edges, with damage to the REBCO layer worsening significantly as slitting pressure increases. To address these issues, two solutions are proposed: a ‘returning the blade’ technique and a laser slitting method, both effectively mitigating damage.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"628 ","pages":"Article 1354629"},"PeriodicalIF":1.3,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135461","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}

{"title":"Motion and thermal stability for high-temperature superconducting maglev vehicle under extreme crosswind conditions","authors":"Le Xu ,&nbsp;Jun Zheng ,&nbsp;Yonghai Zhao ,&nbsp;Peng Pang ,&nbsp;Li Wang ,&nbsp;Jukun Wang","doi":"10.1016/j.physc.2024.1354620","DOIUrl":"10.1016/j.physc.2024.1354620","url":null,"abstract":"<div><div>High-temperature superconductor (HTS) pinning magnetic levitation (maglev) systems show significant potential for high-speed rail transportation applications, attributed to their passive and stable levitation arising from the coupling between HTS bulks and the permanent magnetic guideway (PMG). However, there is a lack of research on the operational safety of HTS maglev trains under extreme crosswind conditions as one significant safety issue of the HTS maglev transport tool. Therefore, this paper employs an experimentally validated two-dimensional electromagnetic-thermal-mechanical model to study the temperature rise variations in HTS bulks under different extreme wind scales, The maximum temperature rise inside the bulk submerged in liquid nitrogen remains below 1 K. It also preliminarily explores the wind scales that cause motion instability in HTS maglev trains. The results indicate that extreme crosswind conditions have minimal effect on the temperature rise of HTS bulks. However, under wind scale 12 conditions, HTS maglev trains face a risk of derailment. These findings offer valuable thermal-motion stability insight for informing the future design and practical implementation of HTS pinning maglev systems.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"628 ","pages":"Article 1354620"},"PeriodicalIF":1.3,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135443","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}

{"title":"Calculation and understanding of the nitrogen doping process in niobium for superconducting radio frequency accelerator","authors":"Yang Ye ,&nbsp;Ziqin Yang ,&nbsp;Shuai Wu ,&nbsp;Jianpeng Li ,&nbsp;Tao Liu ,&nbsp;Guangze Jiang ,&nbsp;Hangxu Li ,&nbsp;Zepeng Jiang ,&nbsp;Jiaqi Liu ,&nbsp;Yuan He ,&nbsp;Wenlong Zhan","doi":"10.1016/j.physc.2024.1354616","DOIUrl":"10.1016/j.physc.2024.1354616","url":null,"abstract":"<div><div>A computational model is developed to predict the nitrogen concentration profile within Nb utilized in superconducting radio-frequency (SRF) accelerators. This model incorporates variations in the sticking coefficient of nitrogen during the adsorption process on the Nb surface, along with the impact of nitride formation resulting from the reaction between Nb and nitrogen. The conclusions drawn from this model are compared with the outcomes of vertical test experiments. The computed results indicate that exhibiting a significant nitrogen doping effect is achieved when the nitrogen concentration is approximately 1E25 atom/m<span><math><msup><mrow></mrow><mrow><mn>3</mn></mrow></msup></math></span> under various nitrogen doping recipes. This study enhances the understanding of the nitrogen doping process and enables the rapid determination of the optimal subsequent material removal thickness for various experimental recipes.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"628 ","pages":"Article 1354616"},"PeriodicalIF":1.3,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135463","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}

{"title":"Development of a 1 kW-class fully high-temperature superconducting induction/synchronous machine that enables non-superconducting operation","authors":"Yunfei Gao ,&nbsp;Taketsune Nakamura ,&nbsp;Miyuki Nakamura ,&nbsp;Takanobu Kiss","doi":"10.1016/j.physc.2024.1354634","DOIUrl":"10.1016/j.physc.2024.1354634","url":null,"abstract":"<div><div>Fully high-temperature superconducting (HTS) rotating machines, with all windings made of high-temperature superconducting materials, have garnered significant interest due to their potential for achieving extremely high efficiency and power density. However, temperature increases caused by accidents can lead to sudden release of high-density current, risking burnout of the machine. This study presents the design, fabrication, and testing of a 1 kW-class fully HTS induction/synchronous machine (HTS-ISM) capable of operating in both superconducting and non-superconducting states. The rotor features a BSCCO/normal conductor hybrid squirrel-cage winding, while the stator uses a face-to-face double-stacked (FFDS) REBCO conductor for its three-phase winding. The 12 stator FFDS coils, with a minimum bending diameter of 17 mm, achieved a average critical current of 132 A when immersed in liquid nitrogen (77 K) and demonstrated a current-carrying capacity of at least 10 A at room temperature. Rotation tests were successfully conducted at temperatures 77 K and above 120 K, confirming superconducting and normal conducting operations. These results demonstrate the feasibility of a fully HTS-ISM capable of reduced-power operation even during cooling system failure, which is crucial for applications in electric aircraft.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"628 ","pages":"Article 1354634"},"PeriodicalIF":1.3,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135462","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}

{"title":"Exploring superconducting signatures in high-pressure hydride compounds: An electronic-structure analysis","authors":"C. Mohammed Krarroubi ,&nbsp;N. Benayad ,&nbsp;F. Benosman ,&nbsp;M. Djermouni ,&nbsp;S. Kacimi ,&nbsp;A. Zaoui","doi":"10.1016/j.physc.2024.1354628","DOIUrl":"10.1016/j.physc.2024.1354628","url":null,"abstract":"<div><div>Employing density functional theory, we investigated the band structure dispersion and density of states (DOS) of hydrogen clathrate materials <em>A</em>H₁₀ (where A=Sc, Y, Lu, Ce, Ac, Th, and Lr). These compounds were compared to the synthesized LaH₁₀ superconductor. A comparative model was utilized to extract predictive parameters as a fingerprint of superconductivity for probable <span><math><mrow><mi>f</mi><mi>c</mi><mi>c</mi></mrow></math></span>-hydrides. The band structure of LaH₁₀ was examined under high pressure, focusing on energy gap variations at specific Brillouin zone points, new parameters derived from band structure data at these points were suggested: <span><math><mrow><mstyle><mi>Δ</mi></mstyle><msub><mi>E</mi><mstyle><mi>Γ</mi></mstyle></msub><mo>,</mo><mrow><mspace></mspace><mstyle><mi>Δ</mi></mstyle></mrow><msub><mi>E</mi><mi>K</mi></msub></mrow></math></span> and <span><math><mrow><mstyle><mi>Δ</mi></mstyle><msub><mi>E</mi><mi>Z</mi></msub></mrow></math></span>. Additionally, two other parameters derived from DOS were proposed: the elemental contribution to the total DOS (<em>N</em>(<em>E</em>_F) in percentage) and the energetic shift of the van Hove singularity peak in the total DOS (<span><math><mrow><mstyle><mi>Δ</mi></mstyle><msub><mi>E</mi><mtext>vHs</mtext></msub></mrow></math></span>). Correlations between these parameters and the <span><math><mrow><mi>F</mi><mi>m</mi><mover><mn>3</mn><mo>¯</mo></mover><mi>m</mi></mrow></math></span> material's stability and superconducting properties were explored. YH₁₀, AcH₁₀, and ScH₁₀ (hypothetically stable in the <span><math><mrow><mi>F</mi><mi>m</mi><mover><mn>3</mn><mo>¯</mo></mover><mi>m</mi></mrow></math></span> structure) exhibited trends similar to LaH₁₀. Conversely, LrH₁₀ displayed a distinct trend, suggesting a potential increase in critical temperature at pressures exceeding 300 GPa. Based on this study, AcH₁₀ and LrH₁₀ were identified as the compounds most closely resembling LaH₁₀ and YH₁₀. However, AcH₁₀ may require extremely high pressures (above 350 GPa) to stabilize in the <span><math><mrow><mi>F</mi><mi>m</mi><mover><mn>3</mn><mo>¯</mo></mover><mi>m</mi></mrow></math></span> structure.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"628 ","pages":"Article 1354628"},"PeriodicalIF":1.3,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135438","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}

{"title":"Structural design and analysis of 7 T active-shield animal MRI magnet system","authors":"Zijie Lin ,&nbsp;Chao Zhou ,&nbsp;Jiaxin Li ,&nbsp;Zhenyu Chu ,&nbsp;Panfeng Zhang ,&nbsp;Leping Wu ,&nbsp;Zhaoyao Gao ,&nbsp;Yongsuo Liu ,&nbsp;Zhan Zhang ,&nbsp;Guolin Ma ,&nbsp;Manxi Xu ,&nbsp;Kuan Lv","doi":"10.1016/j.physc.2024.1354630","DOIUrl":"10.1016/j.physc.2024.1354630","url":null,"abstract":"<div><div>Ultra-high field(≥7 T) magnetic resonance imaging(MRI) systems are expected to provide high-resolution spectrum imaging, multi-nuclide imaging, and structural photos at scales close to neuronal and neural loop levels. Advancements in Ultra-high field MRI for human use necessitate research progress in animal MRI. This work focuses on the design and analysis of superconducting magnets and cryostat for 7 T animal superconducting magnetic resonance imaging systems. Factors considered include electromagnetic stress, safety margins, and uniformity. A detailed analysis and evaluation of the scheme's feasibility are carried out.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"628 ","pages":"Article 1354630"},"PeriodicalIF":1.3,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135440","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}

{"title":"Synergistic strategies for enhancing flux pinning in YBa2Cu3O7-x thin films at high fields and low temperature","authors":"Francesco Rizzo ,&nbsp;Laura Piperno ,&nbsp;Andrea Augieri ,&nbsp;Alexander Meledin ,&nbsp;John Feighan ,&nbsp;Judith L. MacManus-Driscoll ,&nbsp;Giuseppe Celentano","doi":"10.1016/j.physc.2025.1354648","DOIUrl":"10.1016/j.physc.2025.1354648","url":null,"abstract":"<div><div>An unexplored approach for the improvement of the flux pinning of YBa₂Cu₃O_7-x(YBCO) superconducting films grown by pulsed laser deposition (PLD) on SrTiO₃ single-crystals is presented. Hence, substrate-decorated ZrO₂ nanoislands combined with Ba₂Y(Nb/Ta)O₆ nanocolumns were engineered into YBCO films. The nanoislands produced a high density of pinning centres. In this synergistic combined pinning scenario, an absence of a temperature scaling pinning force, <em>F</em>_p(<em>H</em>) behaviour was observed, confirming several pinning mechanisms are active in the system. Thus, the high density of stacking faults and BYTO nanocolumns were both shown to be effective for high field pinning at &lt;50K. Further optimisation of the densities and volumes of each pinning type is expected to produce enhanced high field (&gt;9 T) pinning behaviour.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"630 ","pages":"Article 1354648"},"PeriodicalIF":1.3,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143163786","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}