Physica C-superconductivity and Its Applications最新文献_第8页

Energy and exergy analysis of the cryogenic system for HTS magnets based on an open-cycle G-M/J-T cryocooler 基于开式循环 G-M/J-T 低温冷却器的 HTS 磁体低温系统能量和放能分析

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-03-27 DOI: 10.1016/j.physc.2024.1354478

Jingxin Zheng , Junjie Li

{"title":"Energy and exergy analysis of the cryogenic system for HTS magnets based on an open-cycle G-M/J-T cryocooler","authors":"Jingxin Zheng , Junjie Li","doi":"10.1016/j.physc.2024.1354478","DOIUrl":"https://doi.org/10.1016/j.physc.2024.1354478","url":null,"abstract":"<div><p>High-field magnets have been developed for a broad range of research applications. High-temperature superconducting magnets have received considerable attention due to their potential use in high-field applications. The High Magnetic Field Laboratory of the Chinese Academy of Sciences (CHMFL) is currently designing and constructing high-temperature superconducting (HTS) magnets which need the cooling capacity about 5 W to 10 W at 4.5 K in order to ensure the stability of the system. To meet their operational requirements, a miniature cryogenic system based on the Gifford-McMahon/Joule-Thomson (G-M/J-T) cryocooler has been designed and analyzed. In this research, the performance of the cryogenic system for HTS magnets is investigated systematically by employing both energy analysis and entropy analysis techniques. The results highlight the importance of several key factors, including high pressures, precooling temperature at cooling stages, and J-T exchanger efficiency, for improving the cooling capacity of the cryogenic system. Lowering the precooling temperature can enhance the system cooling capacity and also cause an increase in the precooling capacity. As the pressure increases, the cooling capacity of the system reaches its maximum point at 11.31 bar The J-T heat exchanger accounts for the largest exergy loss rate, 35.2–43.7%. The findings provide technical guidelines for the subsequent experiments and performance optimization <em>of cryogenic system.</em></p></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"619 ","pages":"Article 1354478"},"PeriodicalIF":1.7,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140308551","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 design study on MVAr class superconductor synchronous condenser with no-insulation HTS field coil 采用无绝缘 HTS 磁场线圈的 MVAr 级超导体同步电容器设计研究

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-03-27 DOI: 10.1016/j.physc.2024.1354458

Jaemyung Cha , Jonghoon Yoon , JuKyung Cha , Uijong Bong , Seungyong Hahn

{"title":"A design study on MVAr class superconductor synchronous condenser with no-insulation HTS field coil","authors":"Jaemyung Cha , Jonghoon Yoon , JuKyung Cha , Uijong Bong , Seungyong Hahn","doi":"10.1016/j.physc.2024.1354458","DOIUrl":"https://doi.org/10.1016/j.physc.2024.1354458","url":null,"abstract":"<div><p>With the expansion of distributed power systems and renewable energy worldwide, the use of synchronous condensers (SC) has been gradually increasing to maintain the power quality of an electric grid. Because SC generates fewer harmonics and has the advantage of strengthening system inertia, it is considered as a primary option in Korea over other options such as Static Var Compensator (SVC) and STATic synchronous COMpensator (STATCOM). If superconductor synchronous condenser (SSC) is applied instead of SC, it brings more advantages: (1) it can minimize the adverse impact on the power system due to lower synchronous reactance, and (2) the higher power density can lead to many advantages in a limited area of substation. With these backgrounds, we report a design study on 40 MVAr SSC with no-insulation high-temperature superconductor (NI-HTS) field coil. Firstly, design criteria and procedures for electromagnetic design were set. Secondly, with the design procedure, the electromagnetic design having the minimum HTS conductor usage was obtained among the designs satisfying design criteria. Based on the final design, key characteristics of SSC including no-load voltage, the maximum flux density under the rated-load condition, V-curve characteristic, synchronous reactance, zero sequence reactance, negative sequence reactance, critical current, and NI-HTS characteristics were calculated by using finite element method. Lastly, the design comparison between SSC and SC was presented.</p></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"619 ","pages":"Article 1354458"},"PeriodicalIF":1.7,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140308555","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

Experimental research on the influence of HTS tape width and former type on the transverse compression performance of CORC cables HTS 带宽度和前者类型对 CORC 电缆横向压缩性能影响的实验研究

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-03-27 DOI: 10.1016/j.physc.2024.1354463

Yangyang Shi, Tao Ma, Shaotao Dai, Wenxu Liu

{"title":"Experimental research on the influence of HTS tape width and former type on the transverse compression performance of CORC cables","authors":"Yangyang Shi, Tao Ma, Shaotao Dai, Wenxu Liu","doi":"10.1016/j.physc.2024.1354463","DOIUrl":"https://doi.org/10.1016/j.physc.2024.1354463","url":null,"abstract":"<div><p>The huge transverse Lorentz force experienced by CORC cable during the operation of fusion projects may cause irreversible degradation of its current-carrying capacity. Therefore, it is particularly important to study the influence of cable parameters on their transverse compression performance, and use these influence laws to adjust cable parameters to improve the critical value of transverse compression load that CORC cables can withstand. Solid copper bar former CORC cables with a former diameter of 5.57 mm are produced using HTS (high temperature superconducting) tapes (manufactured by Shanghai Superconductor) of 4 mm and 5 mm width respectively. The experimental results show that the CORC cable wound with 5 mm wide HTS tape has a greater critical transverse compression load than the cable wound with 4 mm wide HTS tape. This indicates that using wider HTS tapes to wind CORC cables can effectively improve their transverse compression performance. A solid copper bar former CORC cable and a stainless steel spiral tube former CORC cable are also produced. Through transverse compression experiments, it is found that the critical transverse compression load of the solid copper bar former and the stainless steel spiral tube former CORC cable are 130 kN/m and 89 kN/m, respectively. This indicates that the solid copper bar former CORC cable has better transverse compression performance. In addition, we also compared the influences of flat and arc pressure blocks on the transverse compression performance of CORC cables, and this experimental results provided a basis for the selection of the bobbin structure when using CORC cables to make coils.</p></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"619 ","pages":"Article 1354463"},"PeriodicalIF":1.7,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140308557","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 on centrifugal deformation effect of magnetic levitation superconducting rotor 磁悬浮超导转子的离心变形效应研究

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-03-27 DOI: 10.1016/j.physc.2024.1354462

Yuan Zhang , Xinning Hu , Chunyan Cui , Xu Cui , Feifei Niu , Luzhong Wang , Qiuliang Wang

{"title":"Investigation on centrifugal deformation effect of magnetic levitation superconducting rotor","authors":"Yuan Zhang , Xinning Hu , Chunyan Cui , Xu Cui , Feifei Niu , Luzhong Wang , Qiuliang Wang","doi":"10.1016/j.physc.2024.1354462","DOIUrl":"https://doi.org/10.1016/j.physc.2024.1354462","url":null,"abstract":"<div><p>The high-speed rotating superconducting rotor can be made into a high-precision inertial device. Centrifugal deformation is one of the key factors affecting the drift speed of the rotating superconducting rotor's polar axis. The larger the drift speed, the worse the accuracy of the inertial device. Applying magnetic torque to the superconducting rotor to compensate for the magnetic disturbance torque generated by centrifugal deformation is one of the effective methods to improve the measurement accuracy of the inertial device made of a superconducting rotor. To compensate for the magnetic disturbance torque caused by centrifugal deformation accurately, we studied the centrifugal deformation effect of the rotating superconducting rotor. In this paper, the centrifugal deformation of the superconducting rotor is analyzed first. And then the influence of centrifugal deformation of the superconducting rotor on magnetic force was studied by Finite Element Method (FEM). The results show that centrifugal deformation can reduce the magnetic levitation force of the superconducting rotor, leading to suspension position drift. Finally, the drift speed of the superconducting rotor's polar axis caused by centrifugal deformation is investigated, including the drift speed caused by centrifugal deformation of the rotating superconducting rotor, as well as the drift speed generated by the coupling of centrifugal deformation and suspension position drift of the superconducting rotor. The research results provide a reference for more accurate compensation of magnetic disturbance torque caused by centrifugal deformation and further improve the accuracy of superconducting rotor inertial devices.</p></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"619 ","pages":"Article 1354462"},"PeriodicalIF":1.7,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140308556","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

Modeling of levitation force by using Jc distribution approaches for bulk MgB2 fabricated with different methods 利用 Jc 分布法为用不同方法制造的块状 MgB2 建立悬浮力模型

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-03-27 DOI: 10.1016/j.physc.2024.1354484

O. Uzun, U.K. Ozturk

{"title":"Modeling of levitation force by using Jc distribution approaches for bulk MgB2 fabricated with different methods","authors":"O. Uzun, U.K. Ozturk","doi":"10.1016/j.physc.2024.1354484","DOIUrl":"https://doi.org/10.1016/j.physc.2024.1354484","url":null,"abstract":"<div><p>Studies in literature have shown that the bulk MgB<sub>2</sub> structural characteristics and the associated superconducting properties are not homogeneous throughout the entire sample. This study focuses on understanding the effect of local differences in J<sub>c</sub> distribution on the levitation force. For this purpose, numerical modeling was performed for four samples, two of which were previously fabricated, and the other two were fictionalized. Levitation forces for these samples were calculated with three different J<sub>c</sub> distribution approaches: uniform, semi-uniform, and non-uniform. Comparing the four samples’ numerical results shows us that the position dependence of J<sub>c</sub> should be considered when performing numerical modeling in cases where there are significant local differences because of the local defects, thermal origin stress cracks in the outer side, and impurity distribution. It is inferred that the obtained results will help to elucidate the physical background of the local features and shielding currents on the levitation force and improve the bulk properties of the MgB<sub>2</sub> samples.</p></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"619 ","pages":"Article 1354484"},"PeriodicalIF":1.7,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140308552","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

AC loss study of high-temperature superconducting stacked conductors based on parameter identification method 基于参数识别方法的高温超导叠层导体交流损耗研究

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-03-27 DOI: 10.1016/j.physc.2024.1354451

Zhiwen Lei , Junwen Wei , Zhiyong Yan , Zi Li , Xuyang Kang , Suxin Wang , Ying Xu , Feiyang Long , Yunfei Tan

{"title":"AC loss study of high-temperature superconducting stacked conductors based on parameter identification method","authors":"Zhiwen Lei , Junwen Wei , Zhiyong Yan , Zi Li , Xuyang Kang , Suxin Wang , Ying Xu , Feiyang Long , Yunfei Tan","doi":"10.1016/j.physc.2024.1354451","DOIUrl":"https://doi.org/10.1016/j.physc.2024.1354451","url":null,"abstract":"<div><p>Fusion magnets generate significant AC loss during the processes of excitation and demagnetization. The electrical measurement was predominantly employed as the method for estimating the AC loss. However, the phase-locked amplifier method and integral method (IM) can access the average power across one or multiple current cycles but leave the instantaneous power value unrecorded. In this study, the AC loss of two types of high-temperature superconducting (HTS) stacked conductors composed of REBCO and Bi-2223 were measured. An AC loss analysis method based on parameter identification method is employed to study AC loss in REBCO and Bi-2223 stacked conductors by identifying their instantaneous inductance and instantaneous resistance. Unlike the integral method, the AC loss analysis method based on parameter identification method can analyze the average power, and also the instantaneous power at any given time using a fixed forgetting factor which can affect the accuracy of the calculation. The experimental data suggest that, under identical frequency and current, the AC loss of the REBCO stacked conductor is approximately three times that of the Bi-2223 stacked conductor.</p></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"619 ","pages":"Article 1354451"},"PeriodicalIF":1.7,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140308554","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

Feasibility study on quench detection methods of Raman and Rayleigh scattering techniques in optical fiber encapsulated HTS coils 光纤封装 HTS 线圈中拉曼和瑞利散射技术淬火检测方法的可行性研究

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-03-27 DOI: 10.1016/j.physc.2024.1354464

Long Zhang , Yingying Lv , Zhuyong Li , Wenyi Li , Yajun Jia , Junjie Jiang , Xiyuan Teng , Zhixuan Zhang , Kyungwoo Ryu

{"title":"Feasibility study on quench detection methods of Raman and Rayleigh scattering techniques in optical fiber encapsulated HTS coils","authors":"Long Zhang , Yingying Lv , Zhuyong Li , Wenyi Li , Yajun Jia , Junjie Jiang , Xiyuan Teng , Zhixuan Zhang , Kyungwoo Ryu","doi":"10.1016/j.physc.2024.1354464","DOIUrl":"https://doi.org/10.1016/j.physc.2024.1354464","url":null,"abstract":"<div><p>Quench detection is a key issue to be solved for safe operation of high temperature superconducting (HTS) magnets. Recently, distributed optical fiber sensors based on Raman and Rayleigh scattering techniques are proposed for quench detection in HTS applications. However, sensing and demodulating principles of these two techniques are different, and they may show different performances in quench detection. In this paper, a 13 m long optical fiber encapsulated HTS coil (OF-coil) was fabricated. Two sensing devices based on Raman and Rayleigh techniques, which are named Raman-device and Rayleigh-device, were prepared. Overcurrent and heater induced quench detection experiments in the OF-coil were carried out and the above two devices were used for quench detection. The results show that both Raman-device and Rayleigh-device can measure temperature changes of the OF-coil in the overcurrent experiment. And their quench response time is 36 s and 14 s, respectively. In heater induced quench detection experiment, Rayleigh-device can successfully acquire local temperature rise of the OF-coil, and the quench response time is 1.7 s. For Raman-device, its spatial resolution is too large to realize local quench detection.</p></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"619 ","pages":"Article 1354464"},"PeriodicalIF":1.7,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140308558","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

On creep of trapped flux near Tc in MgB2 and CaKFe4As4 关于 MgB2 和 CaKFe4As4 中 Tc 附近的滞留通量蠕变

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-03-22 DOI: 10.1016/j.physc.2024.1354487

Sergey L. Bud’ko, Mingyu Xu , Paul C. Canfield

引用次数: 0

Magnetic flux trapping in porous high-Tc superconductors 多孔高锝超导体中的磁通量捕获

IF 1.7 3区物理与天体物理

Physica C-superconductivity and Its Applications Pub Date : 2024-03-13 DOI: 10.1016/j.physc.2024.1354486

Denis Gokhfeld

引用次数: 0

Magnetic-thermal-mechanical coupling behavior simulation for a porous high-temperature superconductor based on fractal derivatives 基于分形导数的多孔高温超导体磁热机械耦合行为模拟