Physica C-superconductivity and Its Applications最新文献_第10页

Effect of laser energy density on microstructure and critical current of YGBCO and HGBCO films fabricated by PLD 激光能量密度对 PLD 制造的 YGBCO 和 HGBCO 薄膜微观结构和临界电流的影响

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-06-13 DOI: 10.1016/j.physc.2024.1354547

Xiang Wu

{"title":"Effect of laser energy density on microstructure and critical current of YGBCO and HGBCO films fabricated by PLD","authors":"Xiang Wu","doi":"10.1016/j.physc.2024.1354547","DOIUrl":"10.1016/j.physc.2024.1354547","url":null,"abstract":"<div>Y0.5Gd0.5Ba2Cu3O7-σ (YGBCO) and Ho0.5Gd0.5Ba2Cu3O7-σ (HGBCO) targets with similar densities were prepared by solid-phase reaction. Pulsed laser deposition (PLD) technology was used to fabricate superconducting films with these targets. During the experiments in this paper, we varied the laser energy by adjusting the optical lens. The structure and texture of RE0.5Gd0.5Ba2Cu3O7-σ (REGBCO, where RE = Y, Ho) thin films were analyzed by X-ray diffraction (XRD). The surface morphology was observed by atomic force microscopy (AFM) and scanning electron microscopy (SEM), and the superconducting critical current was measured at 77 K using the standard four-probe method. The laser energy density and different doping elements can affect the properties of REGBCO films. This may be related to the ejection process of target particles and the size of rare earth atoms. Additionally, we prepared a 510-meter long second-generation high-temperature superconducting tape with the optimized parameters. The critical current of the tape is 350 A, and the current density is 3.9 × 106 A/cm2.</div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"623 ","pages":"Article 1354547"},"PeriodicalIF":1.7,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141395620","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

Gradient magnetic field measurement using first-order gradiometers equipped with 50 mm diameter pickup coils made out of a 2G high-Tc superconducting tape 使用一阶梯度仪测量梯度磁场，梯度仪配备直径 50 毫米的拾取线圈，线圈由 2G 高锝超导带制成

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-06-02 DOI: 10.1016/j.physc.2024.1354519

Kazunori Komori , Shunichi Arisawa , Minoru Tachiki , Shuuichi Ooi , Tadayuki Hayashi , Kazuhiro Endo

引用次数: 0

Development of high superconductor fraction (Ba, K)Fe2As2 wires with improved uniformity by two-axial rolling 通过双轴轧制技术开发出均匀度更高的高超导体分数 (Ba, K)Fe2As2 线材

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-06-02 DOI: 10.1016/j.physc.2024.1354520

Hao Xiong , Chao Yao , Wenwen Guo , Peng Yang , Zhihong Ren , Dongliang Wang , Xianping Zhang , Yanwei Ma

{"title":"Development of high superconductor fraction (Ba, K)Fe2As2 wires with improved uniformity by two-axial rolling","authors":"Hao Xiong , Chao Yao , Wenwen Guo , Peng Yang , Zhihong Ren , Dongliang Wang , Xianping Zhang , Yanwei Ma","doi":"10.1016/j.physc.2024.1354520","DOIUrl":"https://doi.org/10.1016/j.physc.2024.1354520","url":null,"abstract":"<div>Iron-based superconductors are regarded as prospective candidates for high magnetic field applications since they have very high upper critical field and low anisotropy. For practical applications, it is important to develop superconducting wires with strong current carrying capability. In this work, Cu/Ag composite sheathed (Ba, K)Fe2As2 (Ba-122) iron-based superconducting wires were fabricated by a two-axial rolling deformation process and a subsequent hot isostatic pressing (HIP) heat treatment. Compared with the previously reported Cu/Ag/Ba-122 wires prepared by groove rolling, the two-axial rolling allowed to use much thinner Cu/Ag composite sheath for wire fabrication, thus greatly increasing the filling factor of superconducting materials by about 5 times to 24 %, and lowering the volume fraction of silver down to 16 % in wires. By a comparative study on the microstructure and superconducting properties between the wires made by two-axial rolling and groove rolling processes, it is found that besides the significantly increased engineering critical current density, the former also exhibits improved homogeneity of mass distribution and uniformity of Ba-122/Ag interfaces, resulting in significantly enhanced n-values over 40 in magnetic fields up to 14 T. Our work suggests that two-axial rolling, combined with HIP processes, presents a promising approach to prepare iron-based superconducting wires with high filling factor, high uniformity and low cost for practical applications.</div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"622 ","pages":"Article 1354520"},"PeriodicalIF":1.7,"publicationDate":"2024-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141243183","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

Analysis on thermal stability of Rutherford cable fabricated by quasi-isotropic strands 准各向同性股制造的卢瑟福电缆热稳定性分析

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-06-02 DOI: 10.1016/j.physc.2024.1354533

Ye He , Yinshun Wang , Ziqing Meng , Yang Nie , Dongmei Yang , Junhua Cheng , Jiacheng Wang , Wei Pi

{"title":"Analysis on thermal stability of Rutherford cable fabricated by quasi-isotropic strands","authors":"Ye He , Yinshun Wang , Ziqing Meng , Yang Nie , Dongmei Yang , Junhua Cheng , Jiacheng Wang , Wei Pi","doi":"10.1016/j.physc.2024.1354533","DOIUrl":"https://doi.org/10.1016/j.physc.2024.1354533","url":null,"abstract":"<div>A preliminary design of a Rutherford cable (Rfc) consisting of a copper core and 10 Quasi-isotropic Strands (Q-ISs) with symmetrical geometry is proposed. The current sharing temperature (Tcs), minimum quench energy (MQE), and normal zone propagation velocity (NZPV) are significant for determining the thermal stability performance of the superconducting cable. Firstly, an electric model of the conductor equivalent circuit is established, and the algebraic equations are derived. The model is validated with the empirical formula by calculating the Tcs of a single Q-IS. Using the validated model, the Tcs of Rfc fabricated by Q-ISs operating in liquid helium temperature at different magnetic fields are obtained. Then, to quantitatively characterize the effect of Q-ISs located at different positions on Rfc after a heating disturbance, the MQE and NZPV of Rfc are numerically simulated by the finite element method, which uses a 3-D thermal model with a homogenization procedure and coupled with the previous electrical model. The analyzed results provide a preliminary assessment of the thermal stability of the high-current superconducting cable and provide important guidance for subsequent experiments and prospective engineering applications.</div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"622 ","pages":"Article 1354533"},"PeriodicalIF":1.7,"publicationDate":"2024-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141243180","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 pre-overpressure heat treatment on micro-structure and related properties of Bi-2212 round wire 预超压热处理对 Bi-2212 圆线材微观结构和相关性能的影响

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-06-02 DOI: 10.1016/j.physc.2024.1354521

Lei Yu , Hang Zhao , Jianyuan Xu , Hangwei Ding , Zhiyou Chen , Qingbin Hao , Pengcheng Huang , Wenge Chen

{"title":"Influence of pre-overpressure heat treatment on micro-structure and related properties of Bi-2212 round wire","authors":"Lei Yu , Hang Zhao , Jianyuan Xu , Hangwei Ding , Zhiyou Chen , Qingbin Hao , Pengcheng Huang , Wenge Chen","doi":"10.1016/j.physc.2024.1354521","DOIUrl":"https://doi.org/10.1016/j.physc.2024.1354521","url":null,"abstract":"<div>The Bi2Sr2CaCu2O8+x (Bi-2212) material, a high-temperature superconductor, holds significant promise for future high-field applications because of its multifilamentary, twistable production capabilities, coupled with a high upper critical field. Bi-2212 round wire (RW) is made by the powder-in-tube (PIT) technique, and Bi-2212 coils are usually being developed using the wind-and-react method and a high temperature and over-pressure (OP) heat treatment (50 atm, 890℃) is then required to achieve the high current performance. However, over-pressure (OP) heat treatment can lead to a reduction in wire diameter, compromising the stability of the coil structure. Addressing this issue, the pre-overpressure (pre-OP) heat treatment is used and proves effective in mitigating the reduction in Bi-2212 wire diameter. In this paper, to comprehensively investigate the impact of pre-OP heat treatment on the microstructure of Bi-2212 wire, a metallographic analysis of two kinds of Bi-2212 wires was carried out by the scanning electron microscope (SEM) and the ImageJ software. It was found that larger-area filaments experienced a greater reduction in area after pre-OP heat treatment, that pre-OP heat treatment increases the aspect ratio of filaments, and polygonal bundle structure helps maintain filament structure stability during pre-OP heat treatment. Additionally, the impact of pre-OP heat treatment on the performance of Bi-2212 wires was analyzed through critical current testing under high fields.</div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"622 ","pages":"Article 1354521"},"PeriodicalIF":1.7,"publicationDate":"2024-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141243181","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 effect of difference in the characteristic resistance of DP coils on the field and losses of MI HTS magnets DP 线圈特性阻抗差异对 MI HTS 磁体磁场和损耗影响的研究

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-06-02 DOI: 10.1016/j.physc.2024.1354530

Shixian Liu , Lei Wang , Yong Chen , Zili Zhang , Luzhong Wang , Luoyuan Wang , Tengfei Zhi , Xinning Hu , Qiuliang Wang

{"title":"Investigation of the effect of difference in the characteristic resistance of DP coils on the field and losses of MI HTS magnets","authors":"Shixian Liu , Lei Wang , Yong Chen , Zili Zhang , Luzhong Wang , Luoyuan Wang , Tengfei Zhi , Xinning Hu , Qiuliang Wang","doi":"10.1016/j.physc.2024.1354530","DOIUrl":"https://doi.org/10.1016/j.physc.2024.1354530","url":null,"abstract":"<div>We found a significant difference between the central and end magnetic field delays during the testing of a metal-insulation (MI) high-temperature superconducting (HTS) magnet. In this paper, we first analyzed the reasons for the difference in the field, and the results show that it is mainly due to the difference in the characteristic resistance of each double pancake (DP) coil. We further evaluated the effect of the difference on the electromagnetic analysis results of the MI HTS magnet. Subsequently, we developed an equivalent circuit model that considers the difference in the characteristic resistance of the DP coils and used the model to analyze the effect of this difference on the fields and losses generated by the MI HTS magnets, especially for AC conditions. Finally, based on our analytical results, a coil arrangement strategy considering the characteristic resistance of each DP coil was proposed. This work can guide us in evaluating the magnetic field more accurately in future engineering applications and provide a coil arrangement strategy for the MI HTS magnet, which requires to excite rapidly or generate an alternating magnetic field.</div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"622 ","pages":"Article 1354530"},"PeriodicalIF":1.7,"publicationDate":"2024-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141243134","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

Study on the electro-magneto-mechanical characteristics of CORC superconducting cable with striations 带条纹 CORC 超导电缆的电磁机械特性研究

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-05-31 DOI: 10.1016/j.physc.2024.1354497

Rongli Jia , Wenhai Zhou , Rui Liang , Bin Wang , Jiafeng Cao , Shijie Shi

{"title":"Study on the electro-magneto-mechanical characteristics of CORC superconducting cable with striations","authors":"Rongli Jia , Wenhai Zhou , Rui Liang , Bin Wang , Jiafeng Cao , Shijie Shi","doi":"10.1016/j.physc.2024.1354497","DOIUrl":"10.1016/j.physc.2024.1354497","url":null,"abstract":"<div>CORC superconducting cable is a compact and flexible composite superconductor. It is widely used in large power systems because of its good flexibility and high engineering current density. In these applications, reducing the AC loss generated by the superconductor is a key factor in studying the electromagnetic field of the superconducting conductor, which affects the operational stability of the entire superconducting power device. Currently, the use of striated tape-wound cables not only allows for flexible wiring at design time but also effectively reduces AC losses. This technology has been widely used in large superconducting magnet equipment. In this paper, the finite element model of single superconducting tape and CORC superconducting cable is established based on the finite element idea. The electromagnetic properties and mechanical changes are numerically calculated by H-method. The results show that both the current density and the magnetic field of a single superconducting tape show a gradual penetration from the two sides to the center. The area of maximum current density and magnetic field distribution is at the tape boundary. The distribution of current density, magnetic field and Lorentz force of three-dimensional CORC superconducting cable is similar. All of them are gradually attenuated from the maximum value at the boundary to the center position. It is worth noting that the current density, magnetic field and Lorentz force of the striated superconducting cables are smaller than the values without striations. The calculation results of the finite element model in this paper show that the striations weaken the current density, magnetic field and Lorentz force of the CORC superconducting cable by about 8.77%, 16.21% and 9.23%. Moreover, the presence of striations can effectively reduce the AC loss of superconductors.</div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"621 ","pages":"Article 1354497"},"PeriodicalIF":1.7,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141233558","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

A novel joint-less second-generation high-temperature superconducting toroidal coil: Promise for fabricating compact toroidal magnetic fields 新型无接头第二代高温超导环形线圈：有望制造紧凑型环形磁场

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-05-31 DOI: 10.1016/j.physc.2024.1354499

Hao Dong , Daxing Huang , Mingye Huang , Hao Yu , Tongxin Wang , Hongwei Gu , Fazhu Ding

{"title":"A novel joint-less second-generation high-temperature superconducting toroidal coil: Promise for fabricating compact toroidal magnetic fields","authors":"Hao Dong , Daxing Huang , Mingye Huang , Hao Yu , Tongxin Wang , Hongwei Gu , Fazhu Ding","doi":"10.1016/j.physc.2024.1354499","DOIUrl":"10.1016/j.physc.2024.1354499","url":null,"abstract":"<div>This paper presents a novel joint-less toroidal magnet made of second-generation high-temperature superconducting (2G-HTS) tapes. This approach effectively resolves the closed-loop issue for 2G-HTS magnets and has the potential to provide higher and more stable magnetic fields. Compared with traditional 2G-HTS toroidal magnets, while the current loops of the joint-less magnets have no resistance, a decrease in magnetic field still occurs, especially in coils with insulation. Therefore, this work focuses on the decrease of the magnetic field of this novel magnet using experimental and microanalytical methods. For the first time, it was verified that, by winding two coil groups, insulated and no-insulated, parallel charging does not cause interference between them. Furthermore, the magnetic field area was expanded by finite element analysis, and simulations showed that the magnetic field converged with increasing number of coils. Besides, we found that the decrease of the magnetic field was related to the damage of the tape during slitting and winding, where insulated coils were more susceptible to damage during winding. The damage usually occurred at the starting point of the tape slitting, because the copper layer was separated due to adhesion during the winding of insulated coils, which further caused the superconducting layer to detach, resulting in a decrease in the critical current. From our perspective, benefiting from the high critical field of the 2G-HTS tapes, this novel toroidal coil structure has significant implications for the construction of compact toroidal magnets.</div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"621 ","pages":"Article 1354499"},"PeriodicalIF":1.7,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141234396","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

Zero energy bound states on nano atomic line defect in iron-based high temperature superconductors 铁基高温超导体中纳米原子线缺陷的零能束缚态

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-05-28 DOI: 10.1016/j.physc.2024.1354535

Degang Zhang

引用次数: 0

Magneto-thermal-switching in type-I and type-II superconductors I 型和 II 型超导体中的磁热开关

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-05-27 DOI: 10.1016/j.physc.2024.1354536

M. Yoshida , H. Arima , Y. Watanabe , A. Yamashita , Y. Mizuguchi

{"title":"Magneto-thermal-switching in type-I and type-II superconductors","authors":"M. Yoshida , H. Arima , Y. Watanabe , A. Yamashita , Y. Mizuguchi","doi":"10.1016/j.physc.2024.1354536","DOIUrl":"https://doi.org/10.1016/j.physc.2024.1354536","url":null,"abstract":"<div>Thermal switching by applying magnetic field is one of the key technologies in thermal management in electronic devices. In low-temperature devices, superconductors can be used as a magneto-thermal-switching (MTS) materials due to the large change in carrier thermal conductivity by the superconducting transition. In this study, we measured the temperature (T) and magnetic field (H) dependences of thermal conductivity (κ) of Sn, Ta and V to enrich knowledge on MTS of type-Ⅰ and type-Ⅱ superconductors. From the data analyses, we found different trends of κ-H curves in type-Ⅰ and type-Ⅱ superconductors. The normalized κ-H curves of type-Ⅰ superconductors showed the similar behavior, which is solely governed by Hc. However, the κ-H curves of type-Ⅱ superconductors were affected by the Hc1 and Hc2, and its behavior greatly depends on the materials. In addition, we investigated the elemental composition of Sn and Ta to explore the origin of weak hysteresis in the κ-H curves and revealed the importance of impurity on the hysteresis of κ-H curves.</div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"623 ","pages":"Article 1354536"},"PeriodicalIF":1.7,"publicationDate":"2024-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141242647","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