IEEE Transactions on Applied Superconductivity最新文献

英文中文

Low-AC-Loss Nb3Sn Validation Model Coil in Solid Nitrogen for a Fast-Switching-Field MRI Magnet Prototype. 用于快速开关场MRI磁体原型的低交流损耗Nb3Sn在固体氮中的验证模型线圈。

IF 1.8 3区物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Applied Superconductivity

Pub Date : 2026-05-01 Epub Date: 2025-09-26 DOI: 10.1109/tasc.2025.3614571

Jintao Hu, Junseong Kim, Liangjun Shao, Juan Bascuñán, Yukikazu Iwasa, Jerome L Ackerman, Dongkeun Park

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.

在本文中，我们介绍了一种低交流损耗Nb3Sn模型线圈的设计和测试结果，该线圈旨在验证快速开关场磁共振成像（MRI）磁体概念的关键使能技术，该磁体可以在1秒内快速改变磁场，在显著不同的场强之间：用于松弛测量和预极化的高场（3 T）和用于光谱和成像的低场（0.5 T）。虽然传统的MRI磁体需要静态磁场，但我们希望我们提出的具有快速变化磁场的超导磁体可以为新的对比机制提供机会，包括自旋1/2和四极核之间的平交、加速自旋晶格弛豫和绝热退磁/再磁化，通过允许由大场强差实现的微分弛豫测量，以及比例分子/超热成像。我们已经开发并展示了一种创新的磁体设计，它使用了极低交流损耗的Nb3Sn线圈和一种新颖的冷却技术，在线圈和线圈周围的固体氮之间具有高导热的热链接。固体氮中的这些热链接固定在制冷机冷头的一端。这种设计可以在超导磁体的两个磁场之间快速切换，而不会引起猝灭。本文详细介绍了小型快速开关磁场磁体系统的结构、测试结果和线圈最大温升的分析。

{"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":"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.","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}

引用次数: 0

Cooldown and Ramp Test of a Low-Cryogen, Lightweight, Head-Only 7T MRI Magnet. 低低温、轻量、仅头部的7T MRI磁体的冷却和斜坡试验。

IF 1.8 3区物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Applied Superconductivity

Pub Date : 2026-05-01 Epub Date: 2025-10-09 DOI: 10.1109/tasc.2025.3619470

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

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.

在GE医疗保健技术和创新中心，一个紧凑的7.0 T MRI系统（C7T）已成功构建、冷却并提升（通电）到7.01 T。C7T磁体设计用于b0场均匀性

{"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":"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.","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}

引用次数: 0

IEEE Transactions on Applied Superconductivity Information for Authors IEEE应用超导信息汇刊

IF 1.8 3区物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Applied Superconductivity

Pub Date : 2026-03-03 DOI: 10.1109/TASC.2026.3666711

引用次数: 0

IEEE Transactions on Applied Superconductivity Publication Information IEEE应用超导学报出版信息

IF 1.8 3区物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Applied Superconductivity

Pub Date : 2026-03-03 DOI: 10.1109/TASC.2026.3666709

引用次数: 0

IEEE Transactions on Applied Superconductivity Subject Categories for Article Numbering Information 用于物品编号信息的应用超导主题分类

IF 1.8 3区物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Applied Superconductivity

Pub Date : 2026-03-03 DOI: 10.1109/TASC.2026.3668443

引用次数: 0

Filled Thermoplastic Based Coating for Tailored Contact Resistance in HTS Coils 用于高温超导线圈中定制接触电阻的填充热塑性涂层

IF 1.8 3区物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Applied Superconductivity

Pub Date : 2026-03-02 DOI: 10.1109/TASC.2026.3656161

Matteo Crescenti;Bernhard Auchmann;André Brem;Michał Duda;Jaap Kosse;Colin Müller;Kirtana Puthran;Henrique Rodrigues;Jürgen Schmidt;Carmine Senatore

We present a systematic method to tune the turn-to-turn contact resistance

$R_{text{ct}}$

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.

$R_{text{ct}}$

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

$60,^circ text{C}$

and the final

$R_{text{ct}}$

is adjusted through the temperature and the duration of the heat-treatment. This method gives access to a wide range of

$R_{text{ct}}$

. Values from about 50 to

$10^{6},mu Omega cdot text{cm}^{2}$

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

$text{77},text{K}$

achieved the targeted

$R_{text{ct}}$

of around

$70,mu Omega cdot text{cm}^{2}$

. 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.

我们提出了一种系统的方法来调整高温超导（HTS）螺线管中的匝间接触电阻$R_{text{ct}}$，该方法是使用填充镀银铜片（SCCF）的聚乙烯醇丁醛（PVB）热塑性涂层。填料类型及其体积分数决定了最终线圈的可达电阻范围。$R_{text{ct}}$强烈影响非绝缘（NI）高温超导磁体的充电动力学和淬火回弹，因此能够以可靠和可重复的方式控制该参数非常重要。该涂层在连续浸渍涂层工艺中缠绕之前施用，并在胶带上形成干燥的聚合物薄膜。缠绕后，将涂覆层熔融$60,^circ text{C}$以上，最后通过温度和热处理时间调整$R_{text{ct}}$。这种方法可以访问广泛的$R_{text{ct}}$。通过正确选择填料类型、浓度和热处理条件，可以获得50到$10^{6},mu Omega cdot text{cm}^{2}$之间的数值。使用这种方法制造的80转演示螺线管在$text{77},text{K}$上进行了测试，达到了$70,mu Omega cdot text{cm}^{2}$左右的目标$R_{text{ct}}$。利用实测场衰减时间标定的有限元模型提取了平均匝间电阻，验证了调谐方法的正确性。

{"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}

引用次数: 0

Thermal Crosstalk in 24-Pixel Hard X-Ray TES Arrays: Comparative Experiments and Multibody Simulations 24像素硬x射线TES阵列的热串扰：比较实验和多体模拟

IF 1.8 3区物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Applied Superconductivity

Pub Date : 2026-02-23 DOI: 10.1109/TASC.2026.3659736

Panthita Triamkitsawat;Orlando Quaranta;Tejas Guruswamy;Umeshkumar Patel;Lisa Gades;Jonathan Baldwin;Antonino Miceli

In this study, we conducted simulations and experimental characterization of thermal crosstalk in a hard X-ray transition–edge sensor (TES) array. TESs are low-temperature superconducting detectors with excellent energy resolution, making them ideal for synchrotron applications. To achieve the required count rate and collecting area, TES detectors are typically organized into multipixel arrays. However, tight pixel spacing and multiplexing can introduce thermal and electrical crosstalk that degrades spectral resolution at high photon rates. We characterized the crosstalk phenomena between X-ray TESs in a 24-pixel array. This TES array, fabricated at the Argonne National Laboratory (ANL), is designed to operate in the tens of keV regime. In prior work, we experimentally developed procedures and algorithms to identify and quantify crosstalk in various setups. To further explain the phenomenon, we created a multibody model to simulate the thermal crosstalk response between neighboring TES pixels. Simulations correlate the observed thermal crosstalk with key device properties: material composition, TES transition shape parameters (

$alpha$

and

$beta$

), and intrinsic characteristics such as heat capacity and thermal conductance.

在这项研究中，我们对硬x射线过渡边缘传感器（TES）阵列中的热串扰进行了模拟和实验表征。TESs是具有优异能量分辨率的低温超导探测器，是同步加速器应用的理想选择。为了达到所需的计数率和采集面积，TES探测器通常被组织成多像素阵列。然而，紧凑的像素间距和多路复用会引入热和电串扰，从而降低高光子速率下的光谱分辨率。我们在24像素阵列上表征了x射线TESs之间的串扰现象。这个TES阵列由阿贡国家实验室（ANL）制造，设计用于在数十keV的状态下工作。在之前的工作中，我们通过实验开发了程序和算法来识别和量化各种设置中的串扰。为了进一步解释这一现象，我们创建了一个多体模型来模拟相邻TES像素之间的热串扰响应。模拟将观察到的热串扰与关键器件特性相关联：材料成分、TES跃迁形状参数（$alpha$和$beta$）以及热容和导热等固有特性。

{"title":"Thermal Crosstalk in 24-Pixel Hard X-Ray TES Arrays: Comparative Experiments and Multibody Simulations","authors":"Panthita Triamkitsawat;Orlando Quaranta;Tejas Guruswamy;Umeshkumar Patel;Lisa Gades;Jonathan Baldwin;Antonino Miceli","doi":"10.1109/TASC.2026.3659736","DOIUrl":"https://doi.org/10.1109/TASC.2026.3659736","url":null,"abstract":"In this study, we conducted simulations and experimental characterization of thermal crosstalk in a hard X-ray transition–edge sensor (TES) array. TESs are low-temperature superconducting detectors with excellent energy resolution, making them ideal for synchrotron applications. To achieve the required count rate and collecting area, TES detectors are typically organized into multipixel arrays. However, tight pixel spacing and multiplexing can introduce thermal and electrical crosstalk that degrades spectral resolution at high photon rates. We characterized the crosstalk phenomena between X-ray TESs in a 24-pixel array. This TES array, fabricated at the Argonne National Laboratory (ANL), is designed to operate in the tens of keV regime. In prior work, we experimentally developed procedures and algorithms to identify and quantify crosstalk in various setups. To further explain the phenomenon, we created a multibody model to simulate the thermal crosstalk response between neighboring TES pixels. Simulations correlate the observed thermal crosstalk with key device properties: material composition, TES transition shape parameters (<inline-formula><tex-math>$alpha$</tex-math></inline-formula> and <inline-formula><tex-math>$beta$</tex-math></inline-formula>), and intrinsic characteristics such as heat capacity and thermal conductance.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 6","pages":"1-7"},"PeriodicalIF":1.8,"publicationDate":"2026-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147299709","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 Current Redistribution in Multifilamentary REBCO Tapes With Bridges 带桥的多丝REBCO带中电流再分布的研究

IF 1.8 3区物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Applied Superconductivity

Pub Date : 2026-02-23 DOI: 10.1109/TASC.2026.3665684

Martin Kucharovič;Tomáš Kujovič;Fedor Gömöry;Marcela Pekarčíková;Christian R. H. Bahl;Anders C. Wulff;Sara Landvogt

Filamentisation of superconducting tapes is an effective way to reduce alternating current (AC) losses in REBCO-coated conductors. However, current redistribution in filamented tapes may be a challenge, as local defects in individual filaments may lead to reduced performance. A remedy for this is the introduction of periodically spaced short bridges, or non-filamentized sections in the superconductor layer. The purpose of these segments is to facilitate a rerouting of current to even out the consequences of any defects in individual filaments. Multifilamentary REBCO tapes were fabricated starting from SUBRA's three-dimensionally structured Hastelloy substrate, onto which the buffer and superconductor were deposited by THEVA using large-scale industrial processes. We tested the current-voltage properties and evaluated local voltages by soldering voltage contacts onto individual filaments. A numerical model was developed using COMSOL Multiphysics (COMSOL AB, 2024) to simulate current sharing through bridges and within filamented sections. Our results show that bridge length could be reduced from the current 10 mm to approximately 1 mm without compromising redistribution performance. The simulations suggest that current redistribution over distance alone is less effective than using bridges, even at distances approaching 20 cm. Experimental measurements qualitatively confirmed these predictions, showing improved voltage characteristics due to bridges, although quantitative differences remain and warrant further investigation.

超导带的丝状化是减少rebco涂层导体交流电流损耗的有效途径。然而，由于单个细丝的局部缺陷可能导致性能降低，因此在细丝带中进行电流再分配可能是一个挑战。一种补救方法是在超导体层中引入周期性间隔的短桥或非丝状部分。这些分段的目的是为了方便电流的重新布线，以均匀地消除单个细丝中任何缺陷的后果。多丝REBCO带是从SUBRA的三维结构哈氏合金衬底开始制造的，缓冲层和超导体由THEVA使用大规模工业工艺沉积在衬底上。我们测试了电流-电压特性，并通过将电压触点焊接到单个灯丝上来评估局部电压。使用COMSOL Multiphysics （COMSOL AB, 2024）开发了一个数值模型来模拟通过桥和灯丝段的电流共享。我们的研究结果表明，桥长度可以从目前的10毫米减少到大约1毫米，而不会影响再分配性能。模拟表明，即使在接近20厘米的距离上，仅通过距离重新分配电流的效果也不如使用桥。实验测量定性地证实了这些预测，显示出由于电桥而改善的电压特性，尽管数量差异仍然存在，需要进一步研究。

{"title":"Investigation of Current Redistribution in Multifilamentary REBCO Tapes With Bridges","authors":"Martin Kucharovič;Tomáš Kujovič;Fedor Gömöry;Marcela Pekarčíková;Christian R. H. Bahl;Anders C. Wulff;Sara Landvogt","doi":"10.1109/TASC.2026.3665684","DOIUrl":"https://doi.org/10.1109/TASC.2026.3665684","url":null,"abstract":"Filamentisation of superconducting tapes is an effective way to reduce alternating current (AC) losses in REBCO-coated conductors. However, current redistribution in filamented tapes may be a challenge, as local defects in individual filaments may lead to reduced performance. A remedy for this is the introduction of periodically spaced short bridges, or non-filamentized sections in the superconductor layer. The purpose of these segments is to facilitate a rerouting of current to even out the consequences of any defects in individual filaments. Multifilamentary REBCO tapes were fabricated starting from SUBRA's three-dimensionally structured Hastelloy substrate, onto which the buffer and superconductor were deposited by THEVA using large-scale industrial processes. We tested the current-voltage properties and evaluated local voltages by soldering voltage contacts onto individual filaments. A numerical model was developed using COMSOL Multiphysics (COMSOL AB, 2024) to simulate current sharing through bridges and within filamented sections. Our results show that bridge length could be reduced from the current 10 mm to approximately 1 mm without compromising redistribution performance. The simulations suggest that current redistribution over distance alone is less effective than using bridges, even at distances approaching 20 cm. Experimental measurements qualitatively confirmed these predictions, showing improved voltage characteristics due to bridges, although quantitative differences remain and warrant further investigation.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 5","pages":"1-5"},"PeriodicalIF":1.8,"publicationDate":"2026-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147362367","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 Phonon-Mediated Lumped Element Kinetic Inductance Detectors With Surface Activated Bonding 声子介导的表面活化键合集总元件动态电感探测器的研制

IF 1.8 3区物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Applied Superconductivity

Pub Date : 2026-02-23 DOI: 10.1109/TASC.2026.3666868

Ryota Ito;Yuto Kamei;Tohru Taino;Satoru Mima;Takunori Taira;Hideho Odaka;Chiko Otani

In this article, we have proposed novel phonon-mediated lumped element kinetic inductance detectors (LEKIDs) that exploit the anisotropic phonon propagation properties of stoichiometric lithium niobate (sLN). Because of its strong piezoelectricity introducing significant microwave loss, we adopted surface activated bonding (SAB) technology to spatially separate the LEKID electrodes from the sLN substrate, enabling high internal quality factors (

$Q_{i}$

). Simulations and experiments confirmed that this separation significantly suppresses

$Q_{i}$

degradation. LEKIDs were fabricated on the front side of a sapphire substrate, with sLN bonded to the backside using SAB. We achieved an improvement of approximately 1000 times in

$Q_{i}$

compared to devices on sLN. We also observed phonon responses from

$alpha$

-ray irradiation using an

$bf ^{241}$

Am radioactive source. These results demonstrate the potential of phonon-mediated detectors utilizing SAB.

在本文中，我们提出了一种新的声子介导的集总元素动力学电感探测器（LEKIDs），它利用了化学计量型铌酸锂（sLN）的各向异性声子传播特性。由于LEKID具有很强的压电性，导致了显著的微波损耗，我们采用表面活化键合（SAB）技术将LEKID电极与sLN衬底在空间上分离，从而实现了高内部质量因子（$Q_{i}$）。模拟和实验证实，这种分离显著抑制了$Q_{i}$的退化。LEKIDs是在蓝宝石衬底的正面制造的，背面使用SAB粘合sLN。与sLN上的设备相比，我们在$Q_{i}$上实现了大约1000倍的改进。我们还观察了使用$bf ^{241}$Am放射源照射$ α $射线时的声子响应。这些结果证明了利用SAB的声子介导探测器的潜力。

{"title":"Development of Phonon-Mediated Lumped Element Kinetic Inductance Detectors With Surface Activated Bonding","authors":"Ryota Ito;Yuto Kamei;Tohru Taino;Satoru Mima;Takunori Taira;Hideho Odaka;Chiko Otani","doi":"10.1109/TASC.2026.3666868","DOIUrl":"https://doi.org/10.1109/TASC.2026.3666868","url":null,"abstract":"In this article, we have proposed novel phonon-mediated lumped element kinetic inductance detectors (LEKIDs) that exploit the anisotropic phonon propagation properties of stoichiometric lithium niobate (sLN). Because of its strong piezoelectricity introducing significant microwave loss, we adopted surface activated bonding (SAB) technology to spatially separate the LEKID electrodes from the sLN substrate, enabling high internal quality factors (<inline-formula><tex-math>$Q_{i}$</tex-math></inline-formula>). Simulations and experiments confirmed that this separation significantly suppresses <inline-formula><tex-math>$Q_{i}$</tex-math></inline-formula> degradation. LEKIDs were fabricated on the front side of a sapphire substrate, with sLN bonded to the backside using SAB. We achieved an improvement of approximately 1000 times in <inline-formula><tex-math>$Q_{i}$</tex-math></inline-formula> compared to devices on sLN. We also observed phonon responses from <inline-formula><tex-math>$alpha$</tex-math></inline-formula>-ray irradiation using an <inline-formula><tex-math>$bf ^{241}$</tex-math></inline-formula>Am radioactive source. These results demonstrate the potential of phonon-mediated detectors utilizing SAB.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 6","pages":"1-6"},"PeriodicalIF":1.8,"publicationDate":"2026-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147362536","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

Influence of Rare-Earth Variations on the Superconducting Properties of YBCO Films With and Without Artificial Pinning Centers 稀土含量变化对有和无人工钉钉中心YBCO薄膜超导性能的影响

IF 1.8 3区物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Applied Superconductivity

Pub Date : 2026-02-23 DOI: 10.1109/TASC.2026.3666832

M. M. Aye;S. Mejia;H. Huhtinen;P. Paturi

Thin films of Y

$_{1-x}$

$_{x}$

$_{2}$

$_{3}$

$_{7-delta }$

(

$x$

= 0, 1/3, 1/2, 2/3, 1), with and without BaZrO

$_{3}$

(BZO) artificial pinning centers (APCs), were deposited by pulsed laser deposition (PLD) under growth parameters identical to those used for YBa

$_{2}$

$_{3}$

$_{7-delta }$

. The effects of partial Gd substitution on the critical current density

$J_{mathrm{c}}$

were systematically investigated and the results were found to differ between APC-free and BZO-doped films. Partial substitution of Y by Gd significantly enhanced

$J_{mathrm{c}}$

, particularly in films containing BZO nanorods. At 10 K, the

$x$

= 2/3 film with APC showed

$J_{mathrm{c}}$

enhancements up to 45% over the

$x$

= 0 film across a wide magnetic field and temperature range. These findings strongly support Gd doping in YBCO as a highly promising route for future applications requiring maximized magnetic-field-dependent critical current densities.

采用脉冲激光沉积（PLD）方法，在与YBa$_{2}$Cu$_{3}$O$_{7-delta}$相同的生长参数下，制备了Y$_{1-x}$Gd$_{x}$Ba $_{2}$Cu$_{3}$O$_{7-delta}$ （$x$ = 0,1 /3, 1/2, 2/3, 1）和不含BaZrO$_{3}$ （BZO）人工钉钉中心（APCs）的薄膜。系统地研究了部分Gd取代对临界电流密度$J_{ mathm {c}}$的影响，发现无apc和掺杂bzo薄膜的结果有所不同。Gd对Y的部分取代显著增强了$J_{ mathm {c}}$，特别是在含有BZO纳米棒的薄膜中。在10 K时，具有APC的$x$ = 2/3薄膜在较宽的磁场和温度范围内比$x$ = 0薄膜增强了$J_{ mathm {c}}$ 45%。这些发现有力地支持Gd掺杂在YBCO中作为一种非常有前途的途径，用于未来需要最大的磁场依赖临界电流密度的应用。

{"title":"Influence of Rare-Earth Variations on the Superconducting Properties of YBCO Films With and Without Artificial Pinning Centers","authors":"M. M. Aye;S. Mejia;H. Huhtinen;P. Paturi","doi":"10.1109/TASC.2026.3666832","DOIUrl":"https://doi.org/10.1109/TASC.2026.3666832","url":null,"abstract":"Thin films of Y<inline-formula><tex-math>$_{1-x}$</tex-math></inline-formula>Gd<inline-formula><tex-math>$_{x}$</tex-math></inline-formula>Ba <inline-formula><tex-math>$_{2}$</tex-math></inline-formula>Cu<inline-formula><tex-math>$_{3}$</tex-math></inline-formula>O<inline-formula><tex-math>$_{7-delta }$</tex-math></inline-formula> (<inline-formula><tex-math>$x$</tex-math></inline-formula> = 0, 1/3, 1/2, 2/3, 1), with and without BaZrO<inline-formula><tex-math>$_{3}$</tex-math></inline-formula> (BZO) artificial pinning centers (APCs), were deposited by pulsed laser deposition (PLD) under growth parameters identical to those used for YBa<inline-formula><tex-math>$_{2}$</tex-math></inline-formula>Cu<inline-formula><tex-math>$_{3}$</tex-math></inline-formula>O<inline-formula><tex-math>$_{7-delta }$</tex-math></inline-formula>. The effects of partial Gd substitution on the critical current density <inline-formula><tex-math>$J_{mathrm{c}}$</tex-math></inline-formula> were systematically investigated and the results were found to differ between APC-free and BZO-doped films. Partial substitution of Y by Gd significantly enhanced <inline-formula><tex-math>$J_{mathrm{c}}$</tex-math></inline-formula>, particularly in films containing BZO nanorods. At 10 K, the <inline-formula><tex-math>$x$</tex-math></inline-formula> = 2/3 film with APC showed <inline-formula><tex-math>$J_{mathrm{c}}$</tex-math></inline-formula> enhancements up to 45% over the <inline-formula><tex-math>$x$</tex-math></inline-formula> = 0 film across a wide magnetic field and temperature range. These findings strongly support Gd doping in YBCO as a highly promising route for future applications requiring maximized magnetic-field-dependent critical current densities.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"36 5","pages":"1-5"},"PeriodicalIF":1.8,"publicationDate":"2026-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11408015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147362329","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

下一页尾页

类型

全部化学•材料生命科学医学物理工程技术环境•农林材料科学地球科学法学管理学化学环境科学与生态学计算机科学教育学经济学农林科学人文科学生物学数学物理与天体物理心理学综合性期刊其他工业工程理学历史学农学文学信息工程

数据库

全部 ACS Publications Elsevier ieeexplore Springer The Royal Society of Chemistry Wiley

期刊

IEEE Transactions on Applied Superconductivity

全部 Geobiology Appl. Clay Sci. Geochim. Cosmochim. Acta J. Hydrol. Org. Geochem. Carbon Balance Manage. Contrib. Mineral. Petrol. Int. J. Biometeorol. IZV-PHYS SOLID EART+ J. Atmos. Chem. Acta Oceanolog. Sin. Acta Geophys. ACTA GEOL POL ACTA PETROL SIN ACTA GEOL SIN-ENGL AAPG Bull. Acta Geochimica Adv. Atmos. Sci. Adv. Meteorol. Am. J. Phys. Anthropol. Am. J. Sci. Am. Mineral. Annu. Rev. Earth Planet. Sci. Appl. Geochem. Aquat. Geochem. Ann. Glaciol. Archaeol. Anthropol. Sci. ARCHAEOMETRY ARCT ANTARCT ALP RES Asia-Pac. J. Atmos. Sci. ATMOSPHERE-BASEL Atmos. Res. Aust. J. Earth Sci. Atmos. Chem. Phys. Atmos. Meas. Tech. Basin Res. Big Earth Data BIOGEOSCIENCES Geostand. Geoanal. Res. GEOLOGY Geosci. J. Geochem. J. Geochem. Trans. Geosci. Front. Geol. Ore Deposits Global Biogeochem. Cycles Gondwana Res. Geochem. Int. Geol. J. Geophys. Prospect. Geosci. Model Dev. GEOL BELG GROUNDWATER Hydrogeol. J. Hydrol. Earth Syst. Sci. Hydrol. Processes Int. J. Climatol. Int. J. Earth Sci. Int. Geol. Rev. Int. J. Disaster Risk Reduct. Int. J. Geomech. Int. J. Geog. Inf. Sci. Isl. Arc J. Afr. Earth. Sci. J. Adv. Model. Earth Syst. J APPL METEOROL CLIM J. Atmos. Oceanic Technol. J. Atmos. Sol. Terr. Phys. J. Clim. J. Earth Sci. J. Earth Syst. Sci. J. Environ. Eng. Geophys. J. Geog. Sci. Mineral. Mag. Miner. Deposita Mon. Weather Rev. Nat. Hazards Earth Syst. Sci. Nat. Clim. Change Nat. Geosci. Ocean Dyn. Ocean and Coastal Research npj Clim. Atmos. Sci. Ocean Modell. Ocean Sci. Ore Geol. Rev. OCEAN SCI J Paleontol. J. PALAEOGEOGR PALAEOCL PERIOD MINERAL PETROLOGY+ Phys. Chem. Miner. Polar Sci. Prog. Oceanogr. Quat. Sci. Rev. Q. J. Eng. Geol. Hydrogeol. RADIOCARBON Pure Appl. Geophys. Resour. Geol. Rev. Geophys. Sediment. Geol.

﹀