Pub Date : 2024-12-12DOI: 10.1109/TASC.2024.3516743
Jing Chen;Rongtie Huang;Zhiyong Liu;Yong Li;Wenjing Wu;Yuan Du;Minjuan Li;Gang Wang;Chuanbing Cai
The two-step film growth method is proved in the present work to obtain high-performance YBa 2 Cu 3 O 7-δ (YBCO) tapes in the preparation of thick films as 2.4 µm, especially in improving the flux pinning and in-field performances of the BHO-added YBCO tapes. Furthermore, the effects of Dy doping on the properties of YBCO tapes and the combination of Dy doping and BHO nanocrystal addition are investigated. The results show that Dy doping significantly enhances the self-field performance of YBCO tapes. The subsequent addition of BHO nanocrystals after Dy doping further improves the self-field performance by 250 A/12 mm-w. In contrast, the low-temperature field performance of Dy-doped and BHO-added YBCO tapes decreases significantly when compared to pure YBCO tapes. Such results suggest that different rare earth substitutions can play different roles in improving the self-field and in-field properties of YBCO superconducting films.
{"title":"Effects of Dy and BHO Additions on Performances of MOD-YBa2Cu3O7-δ Films by Two-step Method","authors":"Jing Chen;Rongtie Huang;Zhiyong Liu;Yong Li;Wenjing Wu;Yuan Du;Minjuan Li;Gang Wang;Chuanbing Cai","doi":"10.1109/TASC.2024.3516743","DOIUrl":"https://doi.org/10.1109/TASC.2024.3516743","url":null,"abstract":"The two-step film growth method is proved in the present work to obtain high-performance YBa\u0000<sub>2</sub>\u0000Cu\u0000<sub>3</sub>\u0000O\u0000<sub>7-δ</sub>\u0000 (YBCO) tapes in the preparation of thick films as 2.4 µm, especially in improving the flux pinning and in-field performances of the BHO-added YBCO tapes. Furthermore, the effects of Dy doping on the properties of YBCO tapes and the combination of Dy doping and BHO nanocrystal addition are investigated. The results show that Dy doping significantly enhances the self-field performance of YBCO tapes. The subsequent addition of BHO nanocrystals after Dy doping further improves the self-field performance by 250 A/12 mm-w. In contrast, the low-temperature field performance of Dy-doped and BHO-added YBCO tapes decreases significantly when compared to pure YBCO tapes. Such results suggest that different rare earth substitutions can play different roles in improving the self-field and in-field properties of YBCO superconducting films.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-4"},"PeriodicalIF":1.7,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142875077","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}
Pub Date : 2024-12-12DOI: 10.1109/TASC.2024.3515965
J. S. Chung;O. Gileva;C. Ha;J. A Jeon;H. B. Kim;H. L. Kim;Y. H. Kim;H. J. Kim;M. B. Kim;D. H. Kwon;D. S. Leonard;D. Y. Lee;Y. C. Lee;H. S. Lim;K. R. Woo;J. Y. Yang
We present the development of a decay energy spectroscopy (DES) method for the analysis of radioactive impurities using magnetic microcalorimeters (MMCs). The DES system was designed to analyze radionuclides, such as $^{226}$ Ra, $^{228}$ Th, and their daughter nuclides, in materials like copper, commonly used in rare-event search experiments. We tested the DES system with a gold foil absorber measuring 20 $,times, 20 , times$ 0.05 mm $^{3}$ , large enough to accommodate a significant drop of source solution. Using this large absorber and an MMC sensor, we conducted a long-term measurement over ten days of live time, requiring 11 ADR cooling cycles. The combined spectrum achieved an energy resolution of 45 keV FWHM, sufficient to identify most alpha and DES peaks of interest. Specific decay events from radionuclide contaminants in the absorber were identified. This experiment confirms the capability of the DES system to measure alpha decay chains of $^{226}$ Ra and $^{228}$ Th, offering a promising method for radio-impurity evaluation in ultra-low background experiments.
{"title":"Development of Decay Energy Spectroscopy for Radio Impurity Analysis","authors":"J. S. Chung;O. Gileva;C. Ha;J. A Jeon;H. B. Kim;H. L. Kim;Y. H. Kim;H. J. Kim;M. B. Kim;D. H. Kwon;D. S. Leonard;D. Y. Lee;Y. C. Lee;H. S. Lim;K. R. Woo;J. Y. Yang","doi":"10.1109/TASC.2024.3515965","DOIUrl":"https://doi.org/10.1109/TASC.2024.3515965","url":null,"abstract":"We present the development of a decay energy spectroscopy (DES) method for the analysis of radioactive impurities using magnetic microcalorimeters (MMCs). The DES system was designed to analyze radionuclides, such as \u0000<inline-formula><tex-math>$^{226}$</tex-math></inline-formula>\u0000Ra, \u0000<inline-formula><tex-math>$^{228}$</tex-math></inline-formula>\u0000Th, and their daughter nuclides, in materials like copper, commonly used in rare-event search experiments. We tested the DES system with a gold foil absorber measuring 20\u0000<inline-formula><tex-math>$,times, 20 , times$</tex-math></inline-formula>\u0000 0.05 mm\u0000<inline-formula><tex-math>$^{3}$</tex-math></inline-formula>\u0000, large enough to accommodate a significant drop of source solution. Using this large absorber and an MMC sensor, we conducted a long-term measurement over ten days of live time, requiring 11 ADR cooling cycles. The combined spectrum achieved an energy resolution of 45 keV FWHM, sufficient to identify most alpha and DES peaks of interest. Specific decay events from radionuclide contaminants in the absorber were identified. This experiment confirms the capability of the DES system to measure alpha decay chains of \u0000<inline-formula><tex-math>$^{226}$</tex-math></inline-formula>\u0000Ra and \u0000<inline-formula><tex-math>$^{228}$</tex-math></inline-formula>\u0000Th, offering a promising method for radio-impurity evaluation in ultra-low background experiments.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142875109","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}
In the context of the High Field Magnet (HFM) R&D program at CERN, this paper introduces a design proposal for a four-layer cos-theta Nb $_{3}$ Sn dipole. Collaboratively developed by the Italian Institute of Nuclear Physics (INFN) and CERN, the dipole aims to contribute to the advancement of high-field Nb $_{3}$ Sn magnets for future particle colliders, particularly the post-Large Hadron Collider (LHC) era. The target bore field is 14 T, potentially reaching 16T with a reduced margin of operation. Featuring a single aperture, the design incorporates four layers of state-of-the-art Nb $_{3}$ Sn Rutherford cable configured in cos-theta, using the grading technique to exploit the performance of the conductor in the low-field region. To mitigate challenges associated with Nb $_{3}$ Sn cable strain sensitivity, the magnet incorporates the Bladder&Key technique during the pre-loading phase to minimize coil stress. This paper delves into the preliminary electromagnetic design of the dipole, emphasizing optimization for high field quality and performance required for High Energy Physics Particle Accelerator standards. Using 2D Finite Element Method (FEM) simulations, the coil layout is designed, the margins are computed, and a comparison between different designs is made. Furthermore, a 3D FEM analysis is employed to investigate the location of the peak field within the magnet, with a specific focus on the design of coil ends.
{"title":"Design of a Four-Layer Nb3Sn Cos-Theta Dipole in the CERN High Field Magnet R&D Program","authors":"R.U. Valente;E. Beneduce;A. Bersani;M. Bracco;S. Burioli;B. Caiffi;M. Cannavò;G. Crespi;E. De Matteis;S. Dotti;S. Farinon;A. Gagno;F. Levi;S. Mariotto;R. Musenich;D. Novelli;A. Pampaloni;M. Prioli;L. Rossi;N. Sala;M. Sorbi;S. Sorti;M. Statera","doi":"10.1109/TASC.2024.3515962","DOIUrl":"https://doi.org/10.1109/TASC.2024.3515962","url":null,"abstract":"In the context of the High Field Magnet (HFM) R&D program at CERN, this paper introduces a design proposal for a four-layer cos-theta Nb\u0000<inline-formula><tex-math>$_{3}$</tex-math></inline-formula>\u0000Sn dipole. Collaboratively developed by the Italian Institute of Nuclear Physics (INFN) and CERN, the dipole aims to contribute to the advancement of high-field Nb\u0000<inline-formula><tex-math>$_{3}$</tex-math></inline-formula>\u0000Sn magnets for future particle colliders, particularly the post-Large Hadron Collider (LHC) era. The target bore field is 14 T, potentially reaching 16T with a reduced margin of operation. Featuring a single aperture, the design incorporates four layers of state-of-the-art Nb\u0000<inline-formula><tex-math>$_{3}$</tex-math></inline-formula>\u0000Sn Rutherford cable configured in cos-theta, using the grading technique to exploit the performance of the conductor in the low-field region. To mitigate challenges associated with Nb\u0000<inline-formula><tex-math>$_{3}$</tex-math></inline-formula>\u0000Sn cable strain sensitivity, the magnet incorporates the Bladder&Key technique during the pre-loading phase to minimize coil stress. This paper delves into the preliminary electromagnetic design of the dipole, emphasizing optimization for high field quality and performance required for High Energy Physics Particle Accelerator standards. Using 2D Finite Element Method (FEM) simulations, the coil layout is designed, the margins are computed, and a comparison between different designs is made. Furthermore, a 3D FEM analysis is employed to investigate the location of the peak field within the magnet, with a specific focus on the design of coil ends.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142912433","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}
Pub Date : 2024-12-11DOI: 10.1109/TASC.2024.3514597
Hyung-Wook Kim;Yoon Seok Chae;Ji Hyung Kim;Ho Min Kim;Seog-Whan Kim;Jae-Hak Choi;Dong-Jun Kim;Young-Sik Jo
This study explores the application of Smart Insulation (SI) technology in high-temperature superconducting (HTS) coils for rotating electric machines, aimed at enhancing operational stability and efficiency. SI technology acts as an insulator below 160 K and becomes conductive above this temperature, enabling current redistribution during quench events to improve thermal stability. We integrated SI into a 100 kW superconducting motor and conducted extensive tests using a 250 kW universal inverter and EV dynamometer. Despite initial cooling limitations capping output at 30 kW, the SI-equipped motor withstood multiple quench events without damage. Unlike traditional insulated coils prone to overheating, SI coils efficiently prevented hot spots, ensuring stable operation. These results highlight the potential of SI technology to improve the performance and resilience of HTS motors under variable load conditions.
{"title":"Applicability of Smart Insulation High-Temperature Superconducting Coils in Rotating Electric Machines","authors":"Hyung-Wook Kim;Yoon Seok Chae;Ji Hyung Kim;Ho Min Kim;Seog-Whan Kim;Jae-Hak Choi;Dong-Jun Kim;Young-Sik Jo","doi":"10.1109/TASC.2024.3514597","DOIUrl":"https://doi.org/10.1109/TASC.2024.3514597","url":null,"abstract":"This study explores the application of Smart Insulation (SI) technology in high-temperature superconducting (HTS) coils for rotating electric machines, aimed at enhancing operational stability and efficiency. SI technology acts as an insulator below 160 K and becomes conductive above this temperature, enabling current redistribution during quench events to improve thermal stability. We integrated SI into a 100 kW superconducting motor and conducted extensive tests using a 250 kW universal inverter and EV dynamometer. Despite initial cooling limitations capping output at 30 kW, the SI-equipped motor withstood multiple quench events without damage. Unlike traditional insulated coils prone to overheating, SI coils efficiently prevented hot spots, ensuring stable operation. These results highlight the potential of SI technology to improve the performance and resilience of HTS motors under variable load conditions.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142880460","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}
Pub Date : 2024-12-11DOI: 10.1109/TASC.2024.3514599
Zequn Ke;Zhen Huang
High-temperature superconducting (HTS) magnet can provide a significantly high magnetomotive force (MMF) for generators. However, elevated MMF levels can lead to saturation of the ferromagnetic materials. In the case of involving high MMF, the removal of ferromagnetic materials may increase the power density, yet it still results in a reduction of magnetic flux. For generator with iron yoke and teeth, theoretical derivations and simulation analyses of HTS generators with varying geometric parameters reveal two key design directions, i.e., optimal slot width and saturated yoke thickness. And a design scheme of 22 MW superconducting wind generator is provided. In the case of generators with partial iron, the no-load characteristic curve is employed to assess the additional MMF required following the removal of electrical steel materials. Furthermore, the second derivative of no-load characteristic is proposed as the criterion for the trade-off between electrical steel material and MMF. This paper presents a comprehensive design of a superconducting generator and a comparative analysis of iron topologies, provide essential guidance for designing different iron topology design of HTS generator.
{"title":"Electrical Steel Usage and Topology Design Method for HTS Wind Generators","authors":"Zequn Ke;Zhen Huang","doi":"10.1109/TASC.2024.3514599","DOIUrl":"https://doi.org/10.1109/TASC.2024.3514599","url":null,"abstract":"High-temperature superconducting (HTS) magnet can provide a significantly high magnetomotive force (MMF) for generators. However, elevated MMF levels can lead to saturation of the ferromagnetic materials. In the case of involving high MMF, the removal of ferromagnetic materials may increase the power density, yet it still results in a reduction of magnetic flux. For generator with iron yoke and teeth, theoretical derivations and simulation analyses of HTS generators with varying geometric parameters reveal two key design directions, i.e., optimal slot width and saturated yoke thickness. And a design scheme of 22 MW superconducting wind generator is provided. In the case of generators with partial iron, the no-load characteristic curve is employed to assess the additional MMF required following the removal of electrical steel materials. Furthermore, the second derivative of no-load characteristic is proposed as the criterion for the trade-off between electrical steel material and MMF. This paper presents a comprehensive design of a superconducting generator and a comparative analysis of iron topologies, provide essential guidance for designing different iron topology design of HTS generator.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142880289","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}
Pub Date : 2024-12-11DOI: 10.1109/TASC.2024.3508420
{"title":"IEEE Transactions on Applied Superconductivity Information for Authors","authors":"","doi":"10.1109/TASC.2024.3508420","DOIUrl":"https://doi.org/10.1109/TASC.2024.3508420","url":null,"abstract":"","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"34 9","pages":"C4-C4"},"PeriodicalIF":1.7,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10791338","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142810457","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}
Pub Date : 2024-12-11DOI: 10.1109/TASC.2024.3514601
Dong Gun Lee;Jun Hyuk Choi;Minoru Maeda;Seyong Choi;Jung Ho Kim
Since 2015, we have successfully developed magnesium diboride (MgB 2 ) wire at the 3 km-scale and achieved a high critical current density ( J c ) of 3.5 × 10 5 A/mm 2 at 4.2 K and 3 T for various applications. To ensure mechanical strength and performance stability, it is necessary to design MgB 2 wire with a large number of internal filaments. In this study, we conducted a comparative analysis of the number/size of filaments and electrical properties of 19 (18 + 1Cu)-, 37 (30 + 7Cu)-, 61 (54 + 7Cu)-, 91 (72 + 19Cu and 78 + 13Cu)-, and 127 (114 + 13Cu)-filament MgB 2 wires. Increasing the number of filaments had a minor effect on the fill factor and did not significantly enhance the J c . However, it was observed that the deformation of the internal filaments became more inhomogeneous. The mean filament size of the 19-filament architecture was approximately 80 µm, while that of the 127-filament architecture showed a significant reduction, effectively reaching less than 33 µm. The microstructure and characterization of the produced wires are discussed in detail.
{"title":"Perspective on Kilometer-Scale MgB2 Superconducting Wires With 127 Filaments","authors":"Dong Gun Lee;Jun Hyuk Choi;Minoru Maeda;Seyong Choi;Jung Ho Kim","doi":"10.1109/TASC.2024.3514601","DOIUrl":"https://doi.org/10.1109/TASC.2024.3514601","url":null,"abstract":"Since 2015, we have successfully developed magnesium diboride (MgB\u0000<sub>2</sub>\u0000) wire at the 3 km-scale and achieved a high critical current density (\u0000<italic>J</i>\u0000<sub>c</sub>\u0000) of 3.5 × 10\u0000<sup>5</sup>\u0000 A/mm\u0000<sup>2</sup>\u0000 at 4.2 K and 3 T for various applications. To ensure mechanical strength and performance stability, it is necessary to design MgB\u0000<sub>2</sub>\u0000 wire with a large number of internal filaments. In this study, we conducted a comparative analysis of the number/size of filaments and electrical properties of 19 (18 + 1Cu)-, 37 (30 + 7Cu)-, 61 (54 + 7Cu)-, 91 (72 + 19Cu and 78 + 13Cu)-, and 127 (114 + 13Cu)-filament MgB\u0000<sub>2</sub>\u0000 wires. Increasing the number of filaments had a minor effect on the fill factor and did not significantly enhance the \u0000<italic>J</i>\u0000<sub>c</sub>\u0000. However, it was observed that the deformation of the internal filaments became more inhomogeneous. The mean filament size of the 19-filament architecture was approximately 80 µm, while that of the 127-filament architecture showed a significant reduction, effectively reaching less than 33 µm. The microstructure and characterization of the produced wires are discussed in detail.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-4"},"PeriodicalIF":1.7,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938214","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}
Pub Date : 2024-12-11DOI: 10.1109/TASC.2024.3515959
Ryan Smith;Takahiro Kikuchi;Yasushi Sato;Fuminori Hirayama;Akira Sato;Satoshi Kohjiro;Hiroyuki Takahashi
We have developed a gamma-ray spectrometer based on 8-pixel superconducting transition edge sensor (TES) microcalorimeter which can detect gamma rays with energies up to 0.8 MeV. We applied 0.8 mm × 0.8 mm × 0.8 mm Sn absorbers which provide sufficient saturation energies and absorption efficiencies for gamma rays with energies more than 0.2 MeV. We used a mixed source of 137 Cs and 22 Na which emits 32 keV X-rays, 511 keV annihilation radiations and 662 keV gamma rays. Signals from our detector were simultaneously readout using microwave multiplexing. The energy resolution of our 8-pixel TES microcalorimeters were ${text{330}},{text{ eV}} leq Delta {{E}_{text{FWHM}}} leq {text{7.2}} text{keV}$ , and 3 pixels showed better energy resolution than 400 eV for 662 keV gamma rays. The 511 keV annihilation peaks were $Delta E > {text{1}} text{keV}$ , which are most likely caused by the Doppler broadening effect.
{"title":"Development of Transition Edge Sensor Array for Wide Energy Range Gamma-Ray Spectroscopy","authors":"Ryan Smith;Takahiro Kikuchi;Yasushi Sato;Fuminori Hirayama;Akira Sato;Satoshi Kohjiro;Hiroyuki Takahashi","doi":"10.1109/TASC.2024.3515959","DOIUrl":"https://doi.org/10.1109/TASC.2024.3515959","url":null,"abstract":"We have developed a gamma-ray spectrometer based on 8-pixel superconducting transition edge sensor (TES) microcalorimeter which can detect gamma rays with energies up to 0.8 MeV. We applied 0.8 mm × 0.8 mm × 0.8 mm Sn absorbers which provide sufficient saturation energies and absorption efficiencies for gamma rays with energies more than 0.2 MeV. We used a mixed source of \u0000<sup>137</sup>\u0000Cs and \u0000<sup>22</sup>\u0000Na which emits 32 keV X-rays, 511 keV annihilation radiations and 662 keV gamma rays. Signals from our detector were simultaneously readout using microwave multiplexing. The energy resolution of our 8-pixel TES microcalorimeters were \u0000<inline-formula><tex-math>${text{330}},{text{ eV}} leq Delta {{E}_{text{FWHM}}} leq {text{7.2}} text{keV}$</tex-math></inline-formula>\u0000, and 3 pixels showed better energy resolution than 400 eV for 662 keV gamma rays. The 511 keV annihilation peaks were \u0000<inline-formula><tex-math>$Delta E > {text{1}} text{keV}$</tex-math></inline-formula>\u0000, which are most likely caused by the Doppler broadening effect.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-4"},"PeriodicalIF":1.7,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142875133","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}
The quench condition as an extreme operating condition is rarely considered in the mathematical model, but is of great significance to preventing train accidents in advance. In this paper, a closed-loop operational model for the superconducting magnet aboard the vehicle was developed, and comprehensive equivalent circuit equations for the magnetic/rail system were derived, taking into account the magnetic levitation system. The study focused on the current flowing through the superconducting coil and the variations in dynamic magnetic force within the magnetic levitation system during the loss-of-superconductivity process. Secondly, multi-body dynamic mathematical model with 55-degree of freedom (DOF) is established to simulate a more realistic operating condition of the train, and its reliability is validated by SIMPACK/MATLAB co-simulation. Finally, the electro-magnetic interactions with magnet quenched are input into the dynamic model as external disturbances to investigate the vehicle dynamic characteristics of superconducting EDS train. The results indicate that, the quench suspension frame will move laterally and vertically towards the quench side when the SCM is quenched. The lateral displacement speed of the quench magnet is large, and the suspension vehicle will first touch the side wall of the track to cause suspension instability.
{"title":"Study on the Dynamic Characteristics of Superconducting EDS Train With Magnet Quenched Based on a Magneto-Electric-Force Coupled Model","authors":"Zhaoying Yan;Zhengwei Zhao;Fan Yang;Mingjiang Wang;Wenjiao Yang;Baozhu Jia;Yuanyuan Xu","doi":"10.1109/TASC.2024.3515001","DOIUrl":"https://doi.org/10.1109/TASC.2024.3515001","url":null,"abstract":"The quench condition as an extreme operating condition is rarely considered in the mathematical model, but is of great significance to preventing train accidents in advance. In this paper, a closed-loop operational model for the superconducting magnet aboard the vehicle was developed, and comprehensive equivalent circuit equations for the magnetic/rail system were derived, taking into account the magnetic levitation system. The study focused on the current flowing through the superconducting coil and the variations in dynamic magnetic force within the magnetic levitation system during the loss-of-superconductivity process. Secondly, multi-body dynamic mathematical model with 55-degree of freedom (DOF) is established to simulate a more realistic operating condition of the train, and its reliability is validated by SIMPACK/MATLAB co-simulation. Finally, the electro-magnetic interactions with magnet quenched are input into the dynamic model as external disturbances to investigate the vehicle dynamic characteristics of superconducting EDS train. The results indicate that, the quench suspension frame will move laterally and vertically towards the quench side when the SCM is quenched. The lateral displacement speed of the quench magnet is large, and the suspension vehicle will first touch the side wall of the track to cause suspension instability.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142890252","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}
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