IEEE Transactions on Applied Superconductivity最新文献

{"title":"Low-AC-Loss Nb3Sn Validation Model Coil in Solid Nitrogen for a Fast-Switching-Field MRI Magnet Prototype.","authors":"Jintao Hu, Junseong Kim, Liangjun Shao, Juan Bascuñán, Yukikazu Iwasa, Jerome L Ackerman, Dongkeun Park","doi":"10.1109/tasc.2025.3614571","DOIUrl":"10.1109/tasc.2025.3614571","url":null,"abstract":"<p><p>In this paper, we present the design and test results of a low-AC-loss Nb3Sn model coil developed to validate key enabling technologies for a fast-switching-field magnetic resonance imaging (MRI) magnet concept that can change the magnetic field very quickly in time, within 1 second, between significantly different field strengths: a high field (3 T) for relaxometry and prepolarization and a low field (0.5 T) for spectroscopy and imaging. While conventional MRI magnets require a static magnetic field, we expect that our proposed superconducting magnet with rapidly changing fields can provide opportunities for novel contrast mechanisms, which include level-crossing between spin-1/2 and quadrupolar nuclei, accelerated spin-lattice relaxation, and adiabatic demagnetization/remagnetization, by permitting differential relaxometry enabled by a large field strength difference, and ratiometric molecular/superthermal imaging. We have developed and demonstrated an innovative magnet design that uses a very low-AC-loss Nb3Sn coil and a novel cooling technology featuring highly heat-conductive thermal links between the coil and solid nitrogen surrounding the coil. These thermal links in solid nitrogen are anchored at one end to the cryocooler cold head. This design enables rapid switching between two magnetic fields in the superconducting magnet without inducing quench. The paper provides details on the construction, test results, and an analysis of the maximum temperature rise in the coil of the small-scale fast-switching-field magnet system.</p>","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12577748/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145431246","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":"Cooldown and Ramp Test of a Low-Cryogen, Lightweight, Head-Only 7T MRI Magnet.","authors":"Anbo Wu, Justin Ricci, Minfeng Xu, Vijay Soni, Gene Conte, Chris Van Epps, Michael Parizh, Wolfgang Stautner, Yihe Hua, Seung-Kyun Lee, Mark Vermilyea, Desmond Tb Yeo, Thomas Kf Foo","doi":"10.1109/tasc.2025.3619470","DOIUrl":"10.1109/tasc.2025.3619470","url":null,"abstract":"<p><p>A compact 7.0 T MRI system (C7T) has been successfully constructed, cooled down, and ramped (energized) to 7.01 T at GE HealthCare Technology and Innovation Center. The C7T magnet is designed for a B0-field homogeneity of <1.0 ppm over a 26-cm field-of-view, dedicated for MRI brain imaging. The C7T magnet applies a fully closed-loop cryogenic cooling system which condenses only 12 liters of liquid helium at 4.2 K from high pressure helium gas charged at room temperature. The helium is permanently sealed inside the cooling system even after a quench. This newly developed 7.0 T MRI has similar size and stray magnetic field as a clinical whole-body 3.0 T MRI magnet, it can be easily installed in a 3T scanner bay. This C7T MRI system can greatly improve the access to high performance 7T brain imaging for more patients. The cooldown, ramp and quench protection performance of the compact 7T MRI magnet prototype is reported in this paper.</p>","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12829978/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146051826","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":"IEEE Transactions on Applied Superconductivity Information for Authors","authors":"","doi":"10.1109/TASC.2026.3666711","DOIUrl":"https://doi.org/10.1109/TASC.2026.3666711","url":null,"abstract":"","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 2","pages":"C4-C4"},"PeriodicalIF":1.8,"publicationDate":"2026-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11420895","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147362550","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":"IEEE Transactions on Applied Superconductivity Publication Information","authors":"","doi":"10.1109/TASC.2026.3666709","DOIUrl":"https://doi.org/10.1109/TASC.2026.3666709","url":null,"abstract":"","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 2","pages":"C2-C2"},"PeriodicalIF":1.8,"publicationDate":"2026-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11420918","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147362549","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":"IEEE Transactions on Applied Superconductivity Subject Categories for Article Numbering Information","authors":"","doi":"10.1109/TASC.2026.3668443","DOIUrl":"https://doi.org/10.1109/TASC.2026.3668443","url":null,"abstract":"","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 2","pages":"C3-C3"},"PeriodicalIF":1.8,"publicationDate":"2026-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11420916","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147362565","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":"Filled Thermoplastic Based Coating for Tailored Contact Resistance in HTS Coils","authors":"Matteo Crescenti;Bernhard Auchmann;André Brem;Michał Duda;Jaap Kosse;Colin Müller;Kirtana Puthran;Henrique Rodrigues;Jürgen Schmidt;Carmine Senatore","doi":"10.1109/TASC.2026.3656161","DOIUrl":"https://doi.org/10.1109/TASC.2026.3656161","url":null,"abstract":"We present a systematic method to tune the turn-to-turn contact resistance <inline-formula><tex-math>$R_{text{ct}}$</tex-math></inline-formula> in high-temperature superconducting (HTS) solenoids by applying a polyvinyl butyral (PVB) thermoplastic coating filled with silver-coated copper flakes (SCCF). The filler type and its volume fraction determines the accessible resistance range in the final coil. <inline-formula><tex-math>$R_{text{ct}}$</tex-math></inline-formula> strongly affects the charging dynamics and quench resilience of non-insulated (NI) HTS magnets, hence it is important to be able to control this parameter in a reliable and reproducible way. The coating is applied prior to winding in a continuous dip coating process and results in a dry polymeric film on the tape. After winding, the coating layers are fused above <inline-formula><tex-math>$60,^circ text{C}$</tex-math></inline-formula> and the final <inline-formula><tex-math>$R_{text{ct}}$</tex-math></inline-formula> is adjusted through the temperature and the duration of the heat-treatment. This method gives access to a wide range of <inline-formula><tex-math>$R_{text{ct}}$</tex-math></inline-formula>. Values from about 50 to <inline-formula><tex-math>$10^{6},mu Omega cdot text{cm}^{2}$</tex-math></inline-formula> can be obtained with the right choice of filler type, concentration and heat-treatment conditions. An 80-turn demonstrator solenoid fabricated using this approach and tested at <inline-formula><tex-math>$text{77},text{K}$</tex-math></inline-formula> achieved the targeted <inline-formula><tex-math>$R_{text{ct}}$</tex-math></inline-formula> of around <inline-formula><tex-math>$70,mu Omega cdot text{cm}^{2}$</tex-math></inline-formula>. A finite-element model, calibrated with the measured field-decay time, was used to extract the average turn-to-turn resistance and validate the tuning method.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 5","pages":"1-5"},"PeriodicalIF":1.8,"publicationDate":"2026-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11417927","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147362361","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":"Conference Author Index","authors":"","doi":"10.1109/TASC.2026.3682415","DOIUrl":"https://doi.org/10.1109/TASC.2026.3682415","url":null,"abstract":"","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 3","pages":"1-6"},"PeriodicalIF":1.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11498548","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147796000","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.2026.3675407","DOIUrl":"https://doi.org/10.1109/TASC.2026.3675407","url":null,"abstract":"","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 3","pages":"1-1"},"PeriodicalIF":1.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11500588","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147796066","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":"Design and Implementation of an Acoustic Waveguide Quench Detection and Localization Sensor for the HTS Uni-Layer Magnet Prototype","authors":"Davide Cuneo;José Luis Rudeiros Fernández;Antonio Esposito;Maxim Marchevsky;Pasquale Arpaia;Paolo Ferracin","doi":"10.1109/TASC.2025.3627164","DOIUrl":"https://doi.org/10.1109/TASC.2025.3627164","url":null,"abstract":"Detection and localization of quench events are essential to protect superconducting magnets for particle accelerators. Voltage taps are widely adopted for low-temperature superconductors (LTS), but they do not ensure reliable quench detection for high temperature superconducting (HTS) magnets. The propagation velocity of the normal conducting zone is in the order of m/s for LTS, compared to cm/s for HTS, leading to a higher risk of irreversible conductor degradation before any voltage can be detected. As an alternative solution, non-leaky ultrasonic waveguides have been proposed as a diagnostic option to monitor hot-spots by tracking thermally induced sound velocity variations. A first practical implementation of this concept has been developed and tested for a Uni-layer winding prototype at Lawrence Berkeley National Laboratory (LBNL). In this work, we present the practical design of a non-leaky acoustic waveguide tailored for this magnet. We also show the results of an experimental campaign conducted to assess hot-spot detection and localization for the ultrasonic waveguide sensor, both in a straight and a configuration representing the magnet real geometry. Finally, the application of this technique is presented over a Uni-Layer winding prototype copper mock-up. The results of the tests at room temperature and liquid nitrogen temperature are discussed.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 3","pages":"1-5"},"PeriodicalIF":1.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147828706","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}

{"title":"IEEE Membership","authors":"","doi":"10.1109/TASC.2026.3685848","DOIUrl":"https://doi.org/10.1109/TASC.2026.3685848","url":null,"abstract":"","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 3","pages":"1-1"},"PeriodicalIF":1.8,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11498536","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147796152","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}