{"title":"TechRxiv: Share Your Preprint Research with the World!","authors":"","doi":"10.1109/TASC.2025.3593712","DOIUrl":"https://doi.org/10.1109/TASC.2025.3593712","url":null,"abstract":"","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"23-23"},"PeriodicalIF":1.8,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11106332","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144750961","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}
{"title":"Upcoming Special Conference","authors":"","doi":"10.1109/TASC.2025.3589926","DOIUrl":"https://doi.org/10.1109/TASC.2025.3589926","url":null,"abstract":"","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"10-10"},"PeriodicalIF":1.8,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11106299","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144750913","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}
{"title":"Upcoming Special Conference Issues","authors":"","doi":"10.1109/TASC.2025.3570027","DOIUrl":"https://doi.org/10.1109/TASC.2025.3570027","url":null,"abstract":"","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"8-8"},"PeriodicalIF":1.8,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11106335","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144750921","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}
Fernando Jorge Monteiro Dias;Paulo Eduardo Darski Rocha;Gabriel dos Santos
{"title":"Simulating Superconducting Fault Current Limiters With Open-Core and Closed-Core Using the J-A Formulation","authors":"Fernando Jorge Monteiro Dias;Paulo Eduardo Darski Rocha;Gabriel dos Santos","doi":"10.1109/TASC.2025.3593190","DOIUrl":"https://doi.org/10.1109/TASC.2025.3593190","url":null,"abstract":"High-value asymmetrical short-circuit currents test the robustness of electrical equipment, increasing the risk of damage to circuit breakers and substation components. Fault current limiters (FCLs) offer a viable solution to mitigate such impacts without requiring retrofits or layout changes. Among these, the superconducting fault current limiter (SFCL), particularly the saturated iron-core variant (SIC-SFCL), has shown promising performance in both DC and AC substations. This study compares two SIC-SFCL sub-topologies, open-core (OC) and closed-core (CC), through two-dimensional finite element simulations under identical conditions. The model employs the J-A formulation, which relates the current density (J) to the magnetic vector potential (A), allowing for an accurate representation of superconducting tapes. The simulations analyze the response of the SFCLs to different fault scenarios, evaluating their effectiveness in mitigating fault currents. Additionally, voltage drops during steady-state operation, magnetic flux density, and harmonic injections into the grid are examined. Results indicate that the OC configuration exhibits a 10% higher fault current limitation during the initial peak compared to the CC configuration for a 1 kA fault; this advantage increases to 12% for a 3 kA fault. The OC configuration also exhibits reduced harmonic levels compared to the CC configuration. The CC SIC-SFCL presents odd harmonics, third, fifth, seventh, and ninth, which can lead to greater magnetic losses and reduced efficiency compared to the OC model. Conversely, the steady-state voltage drop is lower in the CC configuration than in the OC one. These results highlight the trade-offs between both configurations, serving as a foundation for future SIC-SFCL projects.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 7","pages":"1-8"},"PeriodicalIF":1.8,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144843037","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}
Gregory Cunningham;Yufeng Ye;Kaidong Peng;Alec Yen;Jessica Kedziora;Kevin P. O'Brien
{"title":"Variable Frequency Pulse Generation From Breathers in Josephson Transmission Lines","authors":"Gregory Cunningham;Yufeng Ye;Kaidong Peng;Alec Yen;Jessica Kedziora;Kevin P. O'Brien","doi":"10.1109/TASC.2025.3591399","DOIUrl":"https://doi.org/10.1109/TASC.2025.3591399","url":null,"abstract":"Single flux quantum technology has the potential to enhance readout and control of superconducting quantum systems due to their low energy consumption, high speed, and cryogenic operating temperatures. Current cryogenic readout and control typically requires microwave pulses of specific frequencies to travel between the room temperature control electronics and the cryogenic setup. Latency in control and readout can be improved by generating pulses within the dilution refrigerator. In this work, we consider a protocol for generating gigahertz frequency microwave tones from trains of dc-centered flux solitons and fluxoids in Josephson transmission lines using the dynamics of breather formation, without room temperature synthesis or shunt/bias resistors. Simulations show that pulses with frequencies in the range of 15.2 GHz to 21.5 GHz can be generated with maximal energy efficiency of 97% and bandwidth from 40 MHz to 365 MHz. This protocol can also be used to generate gigahertz frequency Gaussian pulses. We detail metrics relevant to the control and readout of quantum systems, such as input power, output power, and footprint.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 7","pages":"1-9"},"PeriodicalIF":1.8,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144831789","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}