The High Field Magnet (HFM) R&D programme at CERN aims to find technological solutions for the construction of accelerator magnets to be installed in future post-LHC colliders. The Italian Institute for Nuclear Physics (INFN) and CERN are collaborating to design and fabricate a new four-layer cos-theta dipole able to achieve a bore field of 14T with at least 20% margin on the load-line. Two design options are under evaluation: a four-layer dipole entirely made of Nb$_{3}$Sn, and a hybrid configuration combining inner Nb$_{3}$Sn layers with outer NbTi layers. Both options are being assessed for feasibility as short models, with scalable design choices for longer magnet prototypes suitable for accelerator integration. This paper presents a comparative study of the performance of the two design options. The results provide insights into the trade-offs between performance, complexity, and protection constraints in the development of next-generation high-field dipole magnets. The Full-Nb$_{3}$Sn solution satisfies the HFM requirements, but the Hybrid solution is a promising, cost-effective alternative that can be considered for next-generation colliders.
{"title":"Design Comparison of Four-Layer Full-Nb$_{3}$Sn and Hybrid Nb$_{3}$Sn/NbTi Cos-Theta Dipoles for the CERN High Field Magnet R&D Programme","authors":"M. Elisei;E. Beneduce;A. Bersani;M. Bracco;S. Burioli;B. Caiffi;M. Cannavò;G. Crespi;E. De Matteis;S. Dotti;S. Farinon;A.P. Foussat;A. Gagno;T. Maiello;S. Mariotto;R. Musenich;D. Novelli;A. Pampaloni;M. Prioli;L. Rossi;N. Sala;C. Santini;M. Sorbi;S. Sorti;M. Spadotto;M. Statera;E. Todesco;R.U. Valente","doi":"10.1109/TASC.2025.3615181","DOIUrl":"https://doi.org/10.1109/TASC.2025.3615181","url":null,"abstract":"The High Field Magnet (HFM) R&D programme at CERN aims to find technological solutions for the construction of accelerator magnets to be installed in future post-LHC colliders. The Italian Institute for Nuclear Physics (INFN) and CERN are collaborating to design and fabricate a new four-layer cos-theta dipole able to achieve a bore field of 14T with at least 20% margin on the load-line. Two design options are under evaluation: a four-layer dipole entirely made of Nb<inline-formula><tex-math>$_{3}$</tex-math></inline-formula>Sn, and a hybrid configuration combining inner Nb<inline-formula><tex-math>$_{3}$</tex-math></inline-formula>Sn layers with outer NbTi layers. Both options are being assessed for feasibility as short models, with scalable design choices for longer magnet prototypes suitable for accelerator integration. This paper presents a comparative study of the performance of the two design options. The results provide insights into the trade-offs between performance, complexity, and protection constraints in the development of next-generation high-field dipole magnets. The Full-Nb<inline-formula><tex-math>$_{3}$</tex-math></inline-formula>Sn solution satisfies the HFM requirements, but the Hybrid solution is a promising, cost-effective alternative that can be considered for next-generation colliders.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 3","pages":"1-5"},"PeriodicalIF":1.8,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11186144","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145315512","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 : 2025-09-26DOI: 10.1109/TASC.2025.3599362
{"title":"TechRxiv: Share Your Preprint Research with the World!","authors":"","doi":"10.1109/TASC.2025.3599362","DOIUrl":"https://doi.org/10.1109/TASC.2025.3599362","url":null,"abstract":"","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 7","pages":"3-3"},"PeriodicalIF":1.8,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11181244","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145141685","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 : 2025-09-26DOI: 10.1109/TASC.2025.3599364
{"title":"We Gave Today to Inspire a Brighter Tomorrow","authors":"","doi":"10.1109/TASC.2025.3599364","DOIUrl":"https://doi.org/10.1109/TASC.2025.3599364","url":null,"abstract":"","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 7","pages":"4-4"},"PeriodicalIF":1.8,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11181250","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145141686","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}
A 50-period bulk high-temperature superconducting (HTS) undulator employing a staggered-array of RE-Ba-Cu-O bulks and magnetized by a 7 T solenoid is under development for the Shanghai Soft X-ray Free Electron Laser (SXFEL) facility. The system undergoes staged thermal control, including heating above 110 K to suppress superconductivity, followed by field-cooled magnetization at 10 K and flux freezing at 7∼8 K. Precise and uniform temperature control along the HTS insert is essential to achieve a homogeneous undulator field with minimal peak-to-peak error. In this study, we developed a Python-based high-precision temperature control system comprising a single temperature controller, 11 sensors, and two heaters mounted on the 2nd-stage cold heads of the GM cryocoolers at both ends of the dummy HTS insert. Dynamic PID tuning allowed the control system to adapt to the temperature-dependent cooling capacity of the GM cryocoolers, enabling continuous, unidirectional temperature ramping and stabilization with better than ±0.01 K precision across the operation temperature range, 7∼10 K. The associated temperature variation along the 1.5 m-long dummy HTS insert remains within ±0.01K. The experimental setup and measurement results are explained in detail, along with a proposed updated cryogenic design for improved thermal performance.
{"title":"Cryogenic Test and High-Precision Temperature Regulation of a 50-Period Bulk HTS Undulator for SXFEL","authors":"Chan Liu;Dabin Wei;Zhuangwei Chen;Yimin Tong;Kai Zhang","doi":"10.1109/TASC.2025.3614573","DOIUrl":"https://doi.org/10.1109/TASC.2025.3614573","url":null,"abstract":"A 50-period bulk high-temperature superconducting (HTS) undulator employing a staggered-array of RE-Ba-Cu-O bulks and magnetized by a 7 T solenoid is under development for the Shanghai Soft X-ray Free Electron Laser (SXFEL) facility. The system undergoes staged thermal control, including heating above 110 K to suppress superconductivity, followed by field-cooled magnetization at 10 K and flux freezing at 7∼8 K. Precise and uniform temperature control along the HTS insert is essential to achieve a homogeneous undulator field with minimal peak-to-peak error. In this study, we developed a Python-based high-precision temperature control system comprising a single temperature controller, 11 sensors, and two heaters mounted on the 2<sup>nd</sup>-stage cold heads of the GM cryocoolers at both ends of the dummy HTS insert. Dynamic PID tuning allowed the control system to adapt to the temperature-dependent cooling capacity of the GM cryocoolers, enabling continuous, unidirectional temperature ramping and stabilization with better than ±0.01 K precision across the operation temperature range, 7∼10 K. The associated temperature variation along the 1.5 m-long dummy HTS insert remains within ±0.01K. The experimental setup and measurement results are explained in detail, along with a proposed updated cryogenic design for improved thermal performance.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 3","pages":"1-5"},"PeriodicalIF":1.8,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145315513","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 : 2025-09-25DOI: 10.1109/TASC.2025.3614569
Jaehyeok Han;Boun Seo;Jae Young Jang
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.
{"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}
A new type of superconducting wire with high critical current density, fine filament, ultra-low loss experimental NbTi/Cu5Ni/Cu has been developed in this paper for the miniaturized heavy ion therapy device of China. The wire uses Cu-5%Ni alloy instead of conventional high-purity OFC as the matrix, which could prevent the coupling between filaments at low temperature and reduce the eddy current loss effectively. Meanwhile, the Cu5Ni matrix and NbTi filament are separated by high-purity Nb. Nb, as a barrier layer, could isolate the diffusion reaction between Cu and Ti in the process of high-temperature and long-time aging heat treatment. In order to reduce the hysteresis loss of the wire, the filament inside the wire is increased to 75276. The filament diameter is reduced to 1.9 μm under wire diameter of Φ0.8 mm. Due to large number of filaments of the wire, filament breakage and wire breakage phenomena occur during processing of the wire. The Jc (4.2 K, 5 T) of the wire is only 2410 A/mm2, and the “n” value is only 17.9. The hysteresis loss (4.2 K, ±3 T) of the wire is 19.9 mJ/cm3, which reached a new higher level in history.
{"title":"Study on Fine Filament, Ultra-Low Loss Experimental NbTi/Cu5Ni/Cu Superconducting Wires for Accelerator Magnet in WST","authors":"Ruilong Wang;Qiang Guo;Wei Wang;Shuai Wang;Mingyin Qi;Zijing Zhou;Lingxiao Yan;Kailin Zhang;Yanmin Zhu;Pengfei Yan;Shufeng Yang;Yaxue Wang;Jianfeng Li;Xianghong Liu;Yong Feng;Guo Yan;Pingxiang Zhang","doi":"10.1109/TASC.2025.3614564","DOIUrl":"https://doi.org/10.1109/TASC.2025.3614564","url":null,"abstract":"A new type of superconducting wire with high critical current density, fine filament, ultra-low loss experimental NbTi/Cu5Ni/Cu has been developed in this paper for the miniaturized heavy ion therapy device of China. The wire uses Cu-5%Ni alloy instead of conventional high-purity OFC as the matrix, which could prevent the coupling between filaments at low temperature and reduce the eddy current loss effectively. Meanwhile, the Cu5Ni matrix and NbTi filament are separated by high-purity Nb. Nb, as a barrier layer, could isolate the diffusion reaction between Cu and Ti in the process of high-temperature and long-time aging heat treatment. In order to reduce the hysteresis loss of the wire, the filament inside the wire is increased to 75276. The filament diameter is reduced to 1.9 μm under wire diameter of Φ0.8 mm. Due to large number of filaments of the wire, filament breakage and wire breakage phenomena occur during processing of the wire. The <italic>J</i><sub>c</sub> (4.2 K, 5 T) of the wire is only 2410 A/mm<sup>2</sup>, and the “<italic>n</i>” value is only 17.9. The hysteresis loss (4.2 K, ±3 T) of the wire is 19.9 mJ/cm<sup>3</sup>, which reached a new higher level in history.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 3","pages":"1-4"},"PeriodicalIF":1.8,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145405288","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 : 2025-09-24DOI: 10.1109/TASC.2025.3613953
Jin-Tai Yan
It is known that the row-based placement in a rapid single-flux-quantum circuit can be constructed for a given set of logic cells. In this article, given a set of two-pin nets with their extension lengths in a passive transmission line (PTL) routing plane, based on the introduction of a minimal set of used vias for single-flux-quantum (SFQ) pulse integrity, an efficient length-matching-constrained routing algorithm can be proposed for via minimization in a PTL routing plane. First, based on the routability consideration of the routing nets on two available layers and the construction of a routability graph, the detouring points and vias can be assigned onto some nets on X-type or Z-type intersections under nondetouring constraints. Furthermore, based on the result of the net grouping inside some extracted regions, the full or partial nets inside the extracted regions on two available layers can be routed by using one river-routing or maze-routing process. Finally, based on the extension lengths of the unsatisfied nets, the zigzag detouring paths can be inserted into the available areas on two available layers to satisfy the length-matching constraints on the unsatisfied nets. Compared with the open-source routing tool, Qrouter, and Lin’s routing algorithm, quantum global and detailed router (qGDR), in chip routing for via minimization, our proposed routing algorithm can improve 2.7% and 2.0% of routability ratio, decrease 61.0% and 43.5% of the number of the used vias, and decrease 2.7% and 1.7% of the average length of the routed nets with no length-matching constraint in less CPU time for eight tested circuits on the average, respectively. In addition, our proposed routing algorithm only increases 2.0% of the total length of the routed nets with length-matching constraints for eight tested circuits on average.
对于给定的一组逻辑单元，可以构建快速单通量量子电路中的基于行的布局。本文在无源传输线（PTL）路由平面上给定一组具有扩展长度的双引脚网络，在引入单通量量子（SFQ）脉冲完整性的最小通孔集的基础上，提出了一种有效的长度匹配约束路由算法，用于在PTL路由平面上实现通孔最小化。首先，在考虑两层路由网络可达性的基础上，构造可达性图，在无绕行约束的情况下，将绕行点和过孔分配到x型或z型交叉口的网络上。在此基础上，根据提取区域内的网络分组结果，在两个可用层上对提取区域内的全部或部分网络分别采用河流路由或迷宫路由的方法进行路由。最后，根据不满意网的延伸长度，将之字形绕行路径插入到两个可用层的可用区域中，以满足不满意网的长度匹配约束。与开源路由工具Qrouter和Lin的路由算法qGDR （quantum global and detailed router, qGDR）相比，在最小通径的芯片路由中，我们提出的路由算法在更少的CPU时间内，平均可达性比提高2.7%和2.0%，使用的通径数量减少61.0%和43.5%，无长度匹配约束的路由网络平均长度减少2.7%和1.7%。此外，我们提出的路由算法在8个测试电路中平均只增加了长度匹配约束路由网总长度的2.0%。
{"title":"Length-Matching-Constrained Chip Routing for via Minimization in RSFQ Circuits","authors":"Jin-Tai Yan","doi":"10.1109/TASC.2025.3613953","DOIUrl":"https://doi.org/10.1109/TASC.2025.3613953","url":null,"abstract":"It is known that the row-based placement in a rapid single-flux-quantum circuit can be constructed for a given set of logic cells. In this article, given a set of two-pin nets with their extension lengths in a passive transmission line (PTL) routing plane, based on the introduction of a minimal set of used vias for single-flux-quantum (SFQ) pulse integrity, an efficient length-matching-constrained routing algorithm can be proposed for via minimization in a PTL routing plane. First, based on the routability consideration of the routing nets on two available layers and the construction of a routability graph, the detouring points and vias can be assigned onto some nets on X-type or Z-type intersections under nondetouring constraints. Furthermore, based on the result of the net grouping inside some extracted regions, the full or partial nets inside the extracted regions on two available layers can be routed by using one river-routing or maze-routing process. Finally, based on the extension lengths of the unsatisfied nets, the zigzag detouring paths can be inserted into the available areas on two available layers to satisfy the length-matching constraints on the unsatisfied nets. Compared with the open-source routing tool, Qrouter, and Lin’s routing algorithm, quantum global and detailed router (qGDR), in chip routing for via minimization, our proposed routing algorithm can improve 2.7% and 2.0% of routability ratio, decrease 61.0% and 43.5% of the number of the used vias, and decrease 2.7% and 1.7% of the average length of the routed nets with no length-matching constraint in less CPU time for eight tested circuits on the average, respectively. In addition, our proposed routing algorithm only increases 2.0% of the total length of the routed nets with length-matching constraints for eight tested circuits on average.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 8","pages":"1-14"},"PeriodicalIF":1.8,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145256020","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 : 2025-09-24DOI: 10.1109/TASC.2025.3614136
Hailian Jing;Xingyu Li;Heng Zhou;Tong Che;Jichuan Du;Wei Liu
No-insulation (NI) coils have become one of the most promising technologies for high-temperature superconducting (HTS) windings. In this article, we focus on the charging and discharging characteristics of an NI coil wound for a superconducting ac homopolar motor. An electromagnetic thermal model that integrates an equivalent circuit model and a multiphysics model based on the A-formulation is developed and demonstrated by experiments to investigate the charging and discharging behavior of the NI coil. By using the model, the transport current distribution and the average heat loss are first studied, and the normalized current density distribution and heat loss distribution inside the NI coil during a charging and discharging process are presented. The results demonstrate that the turn-to-turn contact introduces charging/discharging delays of the NI coil. During charging, the most severe heat generation occurs when the operating current reaches its peak value, and is concentrated on middle turns of the coil. While discharging, the maximum heat loss appears at the initial stage, and concentrates on the inner side of the coil. By accurately presenting the transient current distribution and the associated heat generation inside the NI coil, the proposed model provides both a theoretical foundation and a practical guideline for improving the stability of NI HTS coils in electrical applications.
{"title":"Charging and Discharging Characteristics of a No-Insulation HTS Field Coil Wound for a Superconducting AC Homopolar Motor","authors":"Hailian Jing;Xingyu Li;Heng Zhou;Tong Che;Jichuan Du;Wei Liu","doi":"10.1109/TASC.2025.3614136","DOIUrl":"https://doi.org/10.1109/TASC.2025.3614136","url":null,"abstract":"No-insulation (NI) coils have become one of the most promising technologies for high-temperature superconducting (HTS) windings. In this article, we focus on the charging and discharging characteristics of an NI coil wound for a superconducting ac homopolar motor. An electromagnetic thermal model that integrates an equivalent circuit model and a multiphysics model based on the A-formulation is developed and demonstrated by experiments to investigate the charging and discharging behavior of the NI coil. By using the model, the transport current distribution and the average heat loss are first studied, and the normalized current density distribution and heat loss distribution inside the NI coil during a charging and discharging process are presented. The results demonstrate that the turn-to-turn contact introduces charging/discharging delays of the NI coil. During charging, the most severe heat generation occurs when the operating current reaches its peak value, and is concentrated on middle turns of the coil. While discharging, the maximum heat loss appears at the initial stage, and concentrates on the inner side of the coil. By accurately presenting the transient current distribution and the associated heat generation inside the NI coil, the proposed model provides both a theoretical foundation and a practical guideline for improving the stability of NI HTS coils in electrical applications.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 9","pages":"1-9"},"PeriodicalIF":1.8,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145255907","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 flat-top pulsed magnetic field (FTPMF) can meet the requirements of many fundamental scientific researches on higher magnetic field, longer flat-top duration, and higher stability. In this paper, a magnet is designed and manufactured to generate a 60 T/100 ms FTPMF at the Wuhan National High Magnetic Field Center (WHMFC). To meet the requirements of the spectroscopy measurements under FTPMF, it has a large inner bore diameter of 38 mm. Due to the limitation of the number of capacitor modules at the WHMFC, a co-optimization strategy for power supply and magnet systems is proposed. It simultaneously optimizes both the magnet structure and the parameters of the power supply system. It reduces the number of capacitor modules required to generate a 60 T/100 ms FTPMF with a flatness of 1% to 28 units. The experimental results show that a FTPMF with a magnetic field of 60.53 T, a duration of 58.9 ms, and a flatness of 1% is obtained using nineteen capacitor modules.
平顶脉冲磁场（FTPMF）可以满足许多基础科学研究对更高磁场、更长的平顶持续时间和更高稳定性的要求。本文在武汉国家强磁场中心（WHMFC）设计并制造了一种磁体，用于产生60 T/100 ms的FTPMF。为了满足FTPMF下光谱测量的要求，它具有38mm的大内孔直径。针对WHMFC中电容器模块数量的限制，提出了一种电源和磁体系统的协同优化策略。同时对磁体结构和供电系统参数进行了优化。它减少了产生60 T/100 ms FTPMF所需的电容器模块数量，平面度为1%至28个单位。实验结果表明，使用19个电容模块可获得磁场为60.53 T、持续时间为58.9 ms、平整度为1%的FTPMF。
{"title":"Design and Test of a 60 T/100 ms Flat-Top Pulsed Magnet With a Large Bore at the WHMFC","authors":"Ziying Pan;Aoming Ge;Shaobo Liu;Shuang Wang;Liang Li;Tao Peng","doi":"10.1109/TASC.2025.3613281","DOIUrl":"https://doi.org/10.1109/TASC.2025.3613281","url":null,"abstract":"The flat-top pulsed magnetic field (FTPMF) can meet the requirements of many fundamental scientific researches on higher magnetic field, longer flat-top duration, and higher stability. In this paper, a magnet is designed and manufactured to generate a 60 T/100 ms FTPMF at the Wuhan National High Magnetic Field Center (WHMFC). To meet the requirements of the spectroscopy measurements under FTPMF, it has a large inner bore diameter of 38 mm. Due to the limitation of the number of capacitor modules at the WHMFC, a co-optimization strategy for power supply and magnet systems is proposed. It simultaneously optimizes both the magnet structure and the parameters of the power supply system. It reduces the number of capacitor modules required to generate a 60 T/100 ms FTPMF with a flatness of 1% to 28 units. The experimental results show that a FTPMF with a magnetic field of 60.53 T, a duration of 58.9 ms, and a flatness of 1% is obtained using nineteen capacitor modules.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 3","pages":"1-6"},"PeriodicalIF":1.8,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145256005","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 : 2025-09-22DOI: 10.1109/TASC.2025.3612348
Jihan Sun;Yawei Wang;Weihang Peng;Yutong Fu;Pai Peng;Zhijian Jin
The demand for high-quality silicon wafers with larger diameters has been heightened due to the fast growth of semiconductor integrated circuit industry. High temperature superconductor (HTS) magnet is capable of generating high static magnetic field at high operating temperature, which plays a crucial role in improving the quality of single silicon crystal during its growth process. Parallel-wound no-insulation (PWNI) HTS coil, wound with parallel-stacked HTS tapes, has the advantages of low inductance, fast ramping rate and enhanced thermal stability. These characteristics give PWNI coil broad application prospect in high-quality silicon wafers production. The simulation model demonstrates that the quench characteristics of PWNI coil differ from those of single-wound no-insulation (SWNI) coil, which is wound using a single tape, due to current redistribution among the stacked tapes. However, experimental data on this topic remains insufficient. This study aims at experimentally investigating and analyzing the local hot-spot quench characteristics of PWNI HTS coil. In this study, voltage taps and Hall sensors are used to monitor the variations in voltage and magnetic field during the local hot-spot quench process of PWNI and SWNI coils. The experimental result confirms that, PWNI coil exhibits superior magnetic field generation capability compared to SWNI coil during the charging process. During the quench process, the PWNI coil exhibits larger voltage perturbations and smaller fluctuations in its central magnetic field compared to the SWNI coil. This study provides data support for understanding the local hot-spot quench properties of PWNI HTS coil, offering reference for its application and design as high-field magnet in advanced technological systems.
随着半导体集成电路产业的快速发展，对大直径高质量硅片的需求不断增加。高温超导体（High temperature superconductor， HTS）磁体能够在高工作温度下产生高静态磁场，在单晶生长过程中对提高单晶质量起着至关重要的作用。并联缠绕无绝缘（PWNI）高温超导线圈采用并联堆叠高温超导带缠绕而成，具有电感小、爬坡速率快、热稳定性强等优点。这些特点使PWNI线圈在高质量硅片生产中具有广阔的应用前景。仿真模型表明，PWNI线圈的猝灭特性不同于单绕无绝缘（SWNI）线圈，这是由于电流在堆叠的带之间重新分布。然而，关于这一主题的实验数据仍然不足。本研究旨在对PWNI高温超导线圈的局部热点淬火特性进行实验研究和分析。在本研究中，使用电压抽头和霍尔传感器来监测PWNI和SWNI线圈局部热点淬火过程中电压和磁场的变化。实验结果证实，PWNI线圈在充电过程中表现出比SWNI线圈更强的磁场产生能力。在淬火过程中，与SWNI线圈相比，PWNI线圈表现出较大的电压扰动和较小的中心磁场波动。该研究为了解PWNI高温超导线圈的局部热点淬火特性提供了数据支持，为其作为高场磁体在先进技术系统中的应用和设计提供了参考。
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