IEEE Transactions on Applied Superconductivity最新文献

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IF 1.8 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-09-26 DOI: 10.1109/TASC.2025.3599362

引用次数: 0

We Gave Today to Inspire a Brighter Tomorrow 我们奉献今天，是为了激发更光明的明天

IF 1.8 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-09-26 DOI: 10.1109/TASC.2025.3599364

引用次数: 0

Proof-of-Concept of a Reinforcement-Learning Based RT Shimming Technique for HTS Magnets 一种基于强化学习的高温超导磁体瞬移技术的概念验证

IF 1.8 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-09-25 DOI: 10.1109/TASC.2025.3614569

Jaehyeok Han;Boun Seo;Jae Young Jang

{"title":"Proof-of-Concept of a Reinforcement-Learning Based RT Shimming Technique for HTS Magnets","authors":"Jaehyeok Han;Boun Seo;Jae Young Jang","doi":"10.1109/TASC.2025.3614569","DOIUrl":"https://doi.org/10.1109/TASC.2025.3614569","url":null,"abstract":"We report a newly developed room-temperature (RT) shimming method for high-temperature superconducting (HTS) magnets employing a deep Q-network (DQN), a type of reinforcement learning theory. With only one training session, the shimming control system (agent) learns how to improve the spatial field homogeneity of an HTS magnet and quickly implements the actual shimming process even under various magnetic field distribution conditions based on the experience gained during the training. Various RT shimming simulations with the MATLAB reinforcement learning toolbox were conducted to verify the feasibility of the method. An agent was trained in a 5 T HTS magnet of which the initial homogeneity was 25.79 ppm at a diameter of 10 mm of the spherical volume (DSV) and enhanced the homogeneity of the magnet under identical field condition. The trained agent was then subjected to various deteriorated field conditions of 32.97 and 35.48 ppm and successfully improved the homogeneity to the target value within a very short time. Shimming results demonstrate that the homogeneity of the HTS magnets, for which the field conditions fluctuate with time due to the screening-current-induced field (SCF) or instability of the power supply, can be improved quickly and frequently by using the proposed method whenever necessary.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 3","pages":"1-6"},"PeriodicalIF":1.8,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145210166","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

Gamma-Ray Irradiation Characteristics of an Organic Olefin-Based Thermosetting Dicyclopentadiene Resin Under Vacuum Atmosphere 有机烯烃基热固性二环戊二烯树脂在真空气氛下的γ射线辐照特性

IF 1.8 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-09-22 DOI: 10.1109/TASC.2025.3612923

Xudong Wang;Akihiro Kikuchi;Masaki Takeuchi;Haruyuki Murakami;Shogo Sonoda;Kazuya Hamada

{"title":"Gamma-Ray Irradiation Characteristics of an Organic Olefin-Based Thermosetting Dicyclopentadiene Resin Under Vacuum Atmosphere","authors":"Xudong Wang;Akihiro Kikuchi;Masaki Takeuchi;Haruyuki Murakami;Shogo Sonoda;Kazuya Hamada","doi":"10.1109/TASC.2025.3612923","DOIUrl":"https://doi.org/10.1109/TASC.2025.3612923","url":null,"abstract":"An organic olefin-based thermosetting dicyclopentadiene (DCP) resin named TELENE was proposed as an impregnation material for Nb3Sn magnets to reduce the training. To verify the radiation resistance of the TELENE, gamma-ray irradiation experiments and three-point bending tests were conducted on the TELENE and the CTD-101K. The TELENE mixed with Gd2O2S powder was also applied for these measurements. The gamma-ray irradiation experiment was carried out up to nearly 20 MGy at room temperature using a Cobalt-60 source at the Takasaki Advanced Radiation Research Institute in Japan. For gamma irradiation in the absence of air, all resin samples were sealed in glass tubes and evacuated. The flexural strength and flexural modulus of each resin were measured by the three-point bending test before and after gamma-ray irradiation. The pure and mixed TELENE exhibits plastic deformation before the irradiation and can withstand larger strain than the CTD-101K. After irradiation, no decrease in flexural strength was observed up to 6 MGy for the pure TELENE and up to 17 MGy for the mixed TELENE. However, their strains at fracture decreased by more than 50% after 5 MGy irradiation.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 3","pages":"1-5"},"PeriodicalIF":1.8,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145210176","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

Development of a 2-D Method for Numerical Analysis of Dynamic and Magnetization Loss in Twisted, Stacked-Tape HTS Cables 扭曲叠带高温超导电缆动态损耗和磁化损耗二维数值分析方法的发展

IF 1.8 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-09-18 DOI: 10.1109/TASC.2025.3611912

Alexander S. Wiseman;Yueming Sun;Nicholas M. Strickland;Zhenan Jiang

{"title":"Development of a 2-D Method for Numerical Analysis of Dynamic and Magnetization Loss in Twisted, Stacked-Tape HTS Cables","authors":"Alexander S. Wiseman;Yueming Sun;Nicholas M. Strickland;Zhenan Jiang","doi":"10.1109/TASC.2025.3611912","DOIUrl":"https://doi.org/10.1109/TASC.2025.3611912","url":null,"abstract":"Twisted, stacked-tape high-temperature superconducting cables, such as partitioned formervacuum pressure impregnated, insulated, partially transposed, extruded, and roll-formed (PIT-VIPER), have become key candidates for use in fusion magnet designs. Modeling ac loss in these cables, which typically contain four stacks of 60–100 tapes, presents a major challenge due to the high computational demands of 3-D simulations. In this work, we present a development of a 2-D scanning method, which divides the twisted geometry into multiple cross-sectional planes, achieving a considerable reduction in simulation time. The scanning method is thoroughly verified in the context of PIT-VIPER cables carrying dc current and exposed to an alternating magnetic field of up to 8 T at a temperature of 20 K. Models are implemented with H-<inline-formula><tex-math>$phi $</tex-math></inline-formula> formulation and contain up to 20 tapes per stack. For applied fields beyond the threshold value, the 2-D scanning shows excellent agreement with a 3-D reference model for magnetization and dynamic loss components, on average within 2%. Through careful selection of scan locations, it is possible to achieve high accuracy even with a small number of 2-D simulations. Although the 2-D method cannot fully capture the complex shielding effects in multitape stacks at low magnetic fields, it still provides reliable estimates of average loss per tape. The approach is also readily adaptable to other applications and cable architectures, including conductor on round core (CORC) and coaxial designs.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 8","pages":"1-9"},"PeriodicalIF":1.8,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145223690","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 Magnetic Properties in Precisely Machined RE-Ba-Cu-O Bulk Superconductors for Use in Undulator Systems 用于波动系统的精密加工RE-Ba-Cu-O块体超导体的磁性研究

IF 1.8 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-09-17 DOI: 10.1109/TASC.2025.3611339

Dabin Wei;Yimin Tong;Chan Liu;Zhuangwei Chen;Ya Shi;Difan Zhou;Marco Calvi;Alexandre Arsenault;Kai Zhang;Haixiao Deng

{"title":"Investigation of Magnetic Properties in Precisely Machined RE-Ba-Cu-O Bulk Superconductors for Use in Undulator Systems","authors":"Dabin Wei;Yimin Tong;Chan Liu;Zhuangwei Chen;Ya Shi;Difan Zhou;Marco Calvi;Alexandre Arsenault;Kai Zhang;Haixiao Deng","doi":"10.1109/TASC.2025.3611339","DOIUrl":"https://doi.org/10.1109/TASC.2025.3611339","url":null,"abstract":"A 50-period high-temperature superconducting (HTS) undulator consisting of staggered-array Gd-Ba-Cu-O (GdBCO)/Ag bulks is under development for application at the Shanghai Soft X-ray Free Electron Laser facility. The key fabrication challenges include precision electrical discharge machining of over 100 cylindrical bulks into half-moon shapes, shrink-fitting into copper sleeves, and grinding each assembly to 4 mm thickness, all while preserving superconducting properties. This paper presents the fabrication process and magnetic field mapping results of all completed samples, which were field-cooled and magnetized using a 0.3 T electromagnet at 77 K. Cracked samples were identified and excluded based on their trapped field profiles. The remaining qualified samples were assessed by integrating the trapped magnetic field over a specified area to quantify their superconducting performance, then sorted and positioned in a staggered-array undulator configuration. Simulation results indicate that the magnetic field inhomogeneity can be reduced to 1.9%, a level suitable for further optimization through adjustment of the ferromagnetic pole heights.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 3","pages":"1-5"},"PeriodicalIF":1.8,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145210156","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 Study on Determining Charging Current Waveform to Reduce Screening Current Induced Field in HTS NMR Magnets 确定充电电流波形以减小HTS核磁共振磁体中筛选电流感应场的研究

IF 1.8 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-09-16 DOI: 10.1109/TASC.2025.3610465

Boun Seo;Wooseung Lee;Jaehyeok Han;Hongmin Yang;Jaemin Kim;Young Jin Hwang;Minchul Ahn;Seungyong Hahn;Hankil Yeom;SangGap Lee;Jae Young Jang

{"title":"A Study on Determining Charging Current Waveform to Reduce Screening Current Induced Field in HTS NMR Magnets","authors":"Boun Seo;Wooseung Lee;Jaehyeok Han;Hongmin Yang;Jaemin Kim;Young Jin Hwang;Minchul Ahn;Seungyong Hahn;Hankil Yeom;SangGap Lee;Jae Young Jang","doi":"10.1109/TASC.2025.3610465","DOIUrl":"https://doi.org/10.1109/TASC.2025.3610465","url":null,"abstract":"In this paper, we present a method for determining the appropriate charging current waveform to mitigate the screening-current-induced field (SCF) in an NMR class HTS magnet. It has been observed that screening currents degrade the magnetic field quality of NMR class HTS magnets, and the extent of this degradation varies depending on the charging current waveform. We developed a simulation program to predict the effects of screening currents when applying specific charging current waveforms to given HTS magnets. Using the program, we were able to determine which current waveforms are most suitable for a given HTS magnet. To validate the performance of the program, we applied the same current waveforms to the actual NMR class HTS magnet and measured the central magnetic field. We compared the experimental results with the simulations and confirmed that they were nearly identical. This technique is expected to allow us to determine the most suitable charging current waveform for reducing screening currents before conducting time-consuming and resource-intensive charging experiments.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 3","pages":"1-6"},"PeriodicalIF":1.8,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145134912","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

Research on Crosstalk of High-Voltage Signal Transmission Cables for Quench Detection System of Chinese Next-Generation Fusion Device 中国下一代核聚变装置猝灭检测系统高压信号传输电缆串扰研究

IF 1.8 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-09-16 DOI: 10.1109/TASC.2025.3610104

Xinxin Zhu;Yezheng Xiao;Yanlan Hu;Longgui Zheng;Qin Yan;Teng Wang;Qicai Ni

{"title":"Research on Crosstalk of High-Voltage Signal Transmission Cables for Quench Detection System of Chinese Next-Generation Fusion Device","authors":"Xinxin Zhu;Yezheng Xiao;Yanlan Hu;Longgui Zheng;Qin Yan;Teng Wang;Qicai Ni","doi":"10.1109/TASC.2025.3610104","DOIUrl":"https://doi.org/10.1109/TASC.2025.3610104","url":null,"abstract":"The quench detection system for next-generation fusion device of China face enormous challenges, as their magnet systems are characterized by significantly higher stored energy and faster discharge rates than those in predecessors, such as EAST and KSTAR. During both the plasma discharge phase and the superconducting magnet quench current discharge phase, rapid current changes induce high and dynamically varying voltages on magnets, particularly in the central solenoid and poloidal field coils, where kilovolt-level inductive voltages can arise. These high-voltage signals can appear on the quench detection signal cables connected to the magnets, leading to capacitive coupling crosstalk between these cables within the same cable tray. Such crosstalk severely interferes with the quench detection signals, compromising the accurate identification of magnet quenches. This can potentially lead to either false quench detection or a failure in quench detection. To address this, this article presents a systematic investigation into the crosstalk phenomenon. It begins by characterizing the properties of quench detection signals. Subsequently, an electrical circuit model for signal cable crosstalk is established, and the influencing factors of crosstalk are analyzed. Finally, the model is validated through a dedicated experiment, whose results are used to predict crosstalk levels in the operational environment and to propose effective mitigation strategies to ensure robust quench detection.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 8","pages":"1-9"},"PeriodicalIF":1.8,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145141768","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

Tensile Strength of REBCO Tape During Deposition of Subsequential Layers REBCO带在后续层沉积过程中的拉伸强度

IF 1.8 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-09-16 DOI: 10.1109/TASC.2025.3610226

Yan Liu;Hongli Suo;Zili Zhang;Lei Wang;Jianhua Liu;Qiuliang Wang

{"title":"Tensile Strength of REBCO Tape During Deposition of Subsequential Layers","authors":"Yan Liu;Hongli Suo;Zili Zhang;Lei Wang;Jianhua Liu;Qiuliang Wang","doi":"10.1109/TASC.2025.3610226","DOIUrl":"https://doi.org/10.1109/TASC.2025.3610226","url":null,"abstract":"ReBa2Cu3O7-x (REBCO) tapes require high yield strength in service; otherwise, excessive stress may seriously damage their superconducting performance or even induce quenching. Therefore, investigating the factors influencing the mechanical performance of REBCO tapes becomes critically important. In this study, the variations in the tensile strength of REBCO tapes during the deposition of various film layers (buffer layer, superconducting layer, Ag layer, and Cu layer) were systematically investigated. The results showed that the yield strength decreased by 525 MPa (approximately 37%) from the bare Hastelloy substrate to the fully fabricated REBCO tape, with the high-temperature deposition of the REBCO layer being the primary contributor to this reduction. Microstructural analysis of each Hastelloy substrate sample, using electron backscatter diffraction, revealed that the REBCO layer deposition led to an increase in grain size and a considerable decrease in dislocation density within the Hastelloy substrate. This microstructural transformation directly contributed to the overall decrease in the yield strength of the REBCO tape. Furthermore, the observed changes in the microstructure of the Hastelloy substrate were attributed to the excessively high temperature employed during the coating process. The findings of this study may provide insights for manufacturers seeking to enhance the mechanical performance of their tapes.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 8","pages":"1-8"},"PeriodicalIF":1.8,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145141773","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

Josephson Junction-Based Compact Notch Purcell Filters for Superconducting Qubit Readout 基于Josephson结的超导量子位读出紧凑型缺口Purcell滤波器

IF 1.8 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2025-09-15 DOI: 10.1109/TASC.2025.3610252

Simona Zaccaria;Antonio Gnudi

{"title":"Josephson Junction-Based Compact Notch Purcell Filters for Superconducting Qubit Readout","authors":"Simona Zaccaria;Antonio Gnudi","doi":"10.1109/TASC.2025.3610252","DOIUrl":"https://doi.org/10.1109/TASC.2025.3610252","url":null,"abstract":"High-fidelity qubit readout in circuit quantum electrodynamics (QED) requires suppressing relaxation due to the Purcell effect, typically achieved through the use of Purcell filters. A key limitation of existing Purcell filter implementations is their large footprint. In this work, we propose a compact notch Purcell filter based on a Josephson junction chain embedded in series with the readout resonator. We analytically derive the conditions for operation in the dispersive regime using a lumped-element model, and validate the concept through an example design that is analyzed through both lumped-element and full electromagnetic simulations. The results indicate that the proposed architecture achieves a Purcell decay time exceeding 1 ms, with a dispersive shift and resonator linewidth of approximately 10 MHz, enabling fast, high signal-to-noise ratio readout. As typical of notch filters, also this solution exhibits an inherent parameter sensitivity. Superconducting quantum interference device (SQUIDs) can be used for postfabrication frequency tuning, at the expense of an increase of the number of required control lines.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 8","pages":"1-7"},"PeriodicalIF":1.8,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11164455","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145223708","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}

引用次数: 0