The joint expertise of ANL and FNAL has led to the production of $text{Nb}_{3}text{Sn}$ undulator magnets in operation in the ANL Advanced Photon Source (APS). These magnets showed performance reproducibility close to the short sample limit, and a design field increase of 20% at 820 A. However, the long training did not allow obtaining the expected 50% increase of the on-axis magnetic field with respect to the ∼1 T produced at 450 A current in the ANL NbTi undulator. To address this, 10-pole long undulator prototypes were fabricated, and CTD-101K was replaced as impregnation material with TELENE, an organic olefin-based thermosetting dicyclopentadiene resin produced by RIMTEC Corporation, Japan. Training and magnet retraining after a thermal cycle were nearly eliminated, with only a couple of quenches needed before reaching short sample limit at over 1,100 A. TELENE will enable operation of $text{Nb}_{3}text{Sn}$ undulators much closer to their short sample limit, expanding the energy range and brightness intensity of light sources. TELENE is Co-60 gamma radiation resistant up to 7–8 MGy, and therefore already applicable to impregnate planar, helical and universal devices operating in lower radiation environments than high energy colliders.
{"title":"Performance Improvement of LTS Undulators for Synchrotron Light Sources","authors":"Emanuela Barzi;Masaki Takeuchi;Daniele Turrioni;Akihiro Kikuchi","doi":"10.1109/TASC.2025.3540817","DOIUrl":"https://doi.org/10.1109/TASC.2025.3540817","url":null,"abstract":"The joint expertise of ANL and FNAL has led to the production of <inline-formula><tex-math>$text{Nb}_{3}text{Sn}$</tex-math></inline-formula> undulator magnets in operation in the ANL Advanced Photon Source (APS). These magnets showed performance reproducibility close to the short sample limit, and a design field increase of 20% at 820 A. However, the long training did not allow obtaining the expected 50% increase of the on-axis magnetic field with respect to the ∼1 T produced at 450 A current in the ANL NbTi undulator. To address this, 10-pole long undulator prototypes were fabricated, and CTD-101K was replaced as impregnation material with TELENE, an organic olefin-based thermosetting dicyclopentadiene resin produced by RIMTEC Corporation, Japan. Training and magnet retraining after a thermal cycle were nearly eliminated, with only a couple of quenches needed before reaching short sample limit at over 1,100 A. TELENE will enable operation of <inline-formula><tex-math>$text{Nb}_{3}text{Sn}$</tex-math></inline-formula> undulators much closer to their short sample limit, expanding the energy range and brightness intensity of light sources. TELENE is Co-60 gamma radiation resistant up to 7–8 MGy, and therefore already applicable to impregnate planar, helical and universal devices operating in lower radiation environments than high energy colliders.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143667267","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 : 2025-03-11DOI: 10.1109/TASC.2025.3550313
Piotr Rogacki;Lucio Fiscarelli;Arnaud Devred;Stephan Russenschuck
An induction-coil magnetometer has been produced at CERN to determine the location of an incipient quench in the HL-LHC Nb$_{text{3}}$Sn inner-triplet quadrupoles. The instrument, known as a quench-antenna, allows the measurement of the position and propagation of quenches with a reduced number of acquisition channels. This is possible because four layers of nested coils are designed to be sensitive only to the normal and skew sextupole and octupole components. Moreover, the magnetometer allows the study of fast magnetic transients due to flux jumps observed during the ramping of Nb$_{text{3}}$Sn superconducting accelerator magnets. This paper presents the observation and characterization of flux jumps during powering ramps similar to machine operations. Spatial and temporal distributions of flux jumps are derived from the induced voltages in the quench-antenna as a function of the transport current. Modeling flux jumps as traveling magnetic moments allows the reconstruction of the effect in terms of position and magnitude and, thus, an estimation of the impact on the magnetic field quality.
{"title":"Measurement of Fast Transients in Nb3Sn Magnets by Using a Static Harmonic-Coil","authors":"Piotr Rogacki;Lucio Fiscarelli;Arnaud Devred;Stephan Russenschuck","doi":"10.1109/TASC.2025.3550313","DOIUrl":"https://doi.org/10.1109/TASC.2025.3550313","url":null,"abstract":"An induction-coil magnetometer has been produced at CERN to determine the location of an incipient quench in the HL-LHC Nb<inline-formula><tex-math>$_{text{3}}$</tex-math></inline-formula>Sn inner-triplet quadrupoles. The instrument, known as a quench-antenna, allows the measurement of the position and propagation of quenches with a reduced number of acquisition channels. This is possible because four layers of nested coils are designed to be sensitive only to the normal and skew sextupole and octupole components. Moreover, the magnetometer allows the study of fast magnetic transients due to flux jumps observed during the ramping of Nb<inline-formula><tex-math>$_{text{3}}$</tex-math></inline-formula>Sn superconducting accelerator magnets. This paper presents the observation and characterization of flux jumps during powering ramps similar to machine operations. Spatial and temporal distributions of flux jumps are derived from the induced voltages in the quench-antenna as a function of the transport current. Modeling flux jumps as traveling magnetic moments allows the reconstruction of the effect in terms of position and magnitude and, thus, an estimation of the impact on the magnetic field quality.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10921665","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143667607","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 : 2025-03-06DOI: 10.1109/TASC.2025.3548585
Deming Huang;Lichao Nie;Chaoqun Jiao;Jin Fang
The conventional electromagnetic maglev train is currently the sole commercially operated high-speed maglev train; however, it faces challenges, such as a narrow suspension gap, excessive energy consumption, and heat dissipation issues. High-temperature superconducting materials possess the advantages of zero resistance and high current-carrying capacity. Building upon the conventional high-speed electromagnetic levitation train, this article proposes a parallel hybrid-excited superconducting electromagnetic support system that incorporates both high-temperature superconducting and conventional components. By considering the symmetry of the support arm and electromagnetic field, certain normally conducting electromagnets are replaced with superconducting ones. Utilizing the conventional electromagnetic support system as a basis, we conducted finite-element simulation to establish and analyze the superconducting hybrid electromagnetic support and linear motor traction system. At suspension gaps of 15 and 20 mm, superconducting electromagnets contribute 80% of the suspension force without significant traction loss, while normally conducting electromagnets require smaller currents for system support and traction functions. The suspension gap can be effectively controlled within a certain safe range (15–20 mm) by maintaining a constant current in the electromagnetic coil.
{"title":"Design and Analysis of Parallel Hybrid-Excited Superconducting Electromagnetic Support System for High-Speed Electromagnetic Suspension Maglev","authors":"Deming Huang;Lichao Nie;Chaoqun Jiao;Jin Fang","doi":"10.1109/TASC.2025.3548585","DOIUrl":"https://doi.org/10.1109/TASC.2025.3548585","url":null,"abstract":"The conventional electromagnetic maglev train is currently the sole commercially operated high-speed maglev train; however, it faces challenges, such as a narrow suspension gap, excessive energy consumption, and heat dissipation issues. High-temperature superconducting materials possess the advantages of zero resistance and high current-carrying capacity. Building upon the conventional high-speed electromagnetic levitation train, this article proposes a parallel hybrid-excited superconducting electromagnetic support system that incorporates both high-temperature superconducting and conventional components. By considering the symmetry of the support arm and electromagnetic field, certain normally conducting electromagnets are replaced with superconducting ones. Utilizing the conventional electromagnetic support system as a basis, we conducted finite-element simulation to establish and analyze the superconducting hybrid electromagnetic support and linear motor traction system. At suspension gaps of 15 and 20 mm, superconducting electromagnets contribute 80% of the suspension force without significant traction loss, while normally conducting electromagnets require smaller currents for system support and traction functions. The suspension gap can be effectively controlled within a certain safe range (15–20 mm) by maintaining a constant current in the electromagnetic coil.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 3","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143667608","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}
High-temperature superconductor (HTS) materials have emerged as promising candidates for high-field magnets due to their superior critical current density, temperature, and magnetic fields. During magnet quench, high current density can quickly lead to local temperature increase and temperature gradient that can potentially damage the coil. This paper presents an analysis of the mechanical impact of the large thermal gradients. The study employs 3D finite element method (FEM) simulations to investigate the mechanical responses of second-generation HTS tapes to different hotspot temperature profiles. The focus is on analyzing the axial tape strain, normal stress and the various shear stresses in tape layer interfaces. We consider both single tapes and tape stacks. The normal zone propagation is not simulated, but we examine different end-temperature profiles to identify the critical thermal conditions that may lead to too large strain or stress. The results suggest that induced axial strain can exceed the elastic limit or lead to irreversible critical current reduction. Also, the shear stress computed using the Mohr-Coulomb criterion may reach very high values potentially leading to mixed-mode delamination. Future studies are needed to verify the damage methods after high temperatures and help in determining the maximum safe temperature in magnet design. The results highlight the importance of mechanical boundary conditions in this type of numerical or experimental study.
{"title":"Mechanical Simulation of 2G HTS Tapes and Stacks During Localized Temperature Increase","authors":"Hamed Milanchian;Shahriar Bakrani Balani;Tiina Salmi","doi":"10.1109/TASC.2025.3548635","DOIUrl":"https://doi.org/10.1109/TASC.2025.3548635","url":null,"abstract":"High-temperature superconductor (HTS) materials have emerged as promising candidates for high-field magnets due to their superior critical current density, temperature, and magnetic fields. During magnet quench, high current density can quickly lead to local temperature increase and temperature gradient that can potentially damage the coil. This paper presents an analysis of the mechanical impact of the large thermal gradients. The study employs 3D finite element method (FEM) simulations to investigate the mechanical responses of second-generation HTS tapes to different hotspot temperature profiles. The focus is on analyzing the axial tape strain, normal stress and the various shear stresses in tape layer interfaces. We consider both single tapes and tape stacks. The normal zone propagation is not simulated, but we examine different end-temperature profiles to identify the critical thermal conditions that may lead to too large strain or stress. The results suggest that induced axial strain can exceed the elastic limit or lead to irreversible critical current reduction. Also, the shear stress computed using the Mohr-Coulomb criterion may reach very high values potentially leading to mixed-mode delamination. Future studies are needed to verify the damage methods after high temperatures and help in determining the maximum safe temperature in magnet design. The results highlight the importance of mechanical boundary conditions in this type of numerical or experimental study.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-6"},"PeriodicalIF":1.7,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10916518","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654961","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}
High temperature superconducting (HTS) coils have promising applications in superconducting magnetic bearings (SMB). In this paper, we designed a radial-type SMB consists of permanent magnet (PM) rotor and HTS coil stator. The internal rotor is a Halbach array of PM and iron sheet. The external stator consists of two closed double pancake HTS coils connected in series and an open-loop coil. A three-dimensional (3D) finite element model was established to analyze the levitation force and radial stability of the proposed SMB. The results indicate that the SMB can support load of 4613 N under 120 A current. The SMB exhibits an axial stiffness of 911 N/mm and a radial stiffness of 435 N/mm, with stiffness decreasing as the coil current increases. This work contributes to exploring the potential of HTS coils in bearing applications and guides the design of SMB.
{"title":"3D Numerical Studies of a Radial-Type Superconducting Magnetic Bearing Consisting of HTS Coils and PM","authors":"Qi Xu;Yi Lin;Ruixiang Wang;Changhao Hu;Jianzhao Geng","doi":"10.1109/TASC.2025.3544616","DOIUrl":"https://doi.org/10.1109/TASC.2025.3544616","url":null,"abstract":"High temperature superconducting (HTS) coils have promising applications in superconducting magnetic bearings (SMB). In this paper, we designed a radial-type SMB consists of permanent magnet (PM) rotor and HTS coil stator. The internal rotor is a Halbach array of PM and iron sheet. The external stator consists of two closed double pancake HTS coils connected in series and an open-loop coil. A three-dimensional (3D) finite element model was established to analyze the levitation force and radial stability of the proposed SMB. The results indicate that the SMB can support load of 4613 N under 120 A current. The SMB exhibits an axial stiffness of 911 N/mm and a radial stiffness of 435 N/mm, with stiffness decreasing as the coil current increases. This work contributes to exploring the potential of HTS coils in bearing applications and guides the design of SMB.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143667286","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 : 2025-03-03DOI: 10.1109/TASC.2025.3546930
Ivan De Carlo;Matteo Fretto;Natascia De Leo;Gianluca Milano
Recently, superconducting nanostructures gained particular attention due to the visualisation of some intriguing phenomena, such as phase fluctuations, quantum phase slip, shape resonance in critical temperature, allowing the definition of a tailored superconducting nanodevice with the desired superconducting features, quantum phenomena. A deep investigation into the relationship between superconductivity, low dimensionality, quantum phenomena should be performed, in order to explain the emergence mechanism of these effects in nanostructures, how superconductivity is affected. In the following, we report on the investigation of the superconductive transition in triangular-shaped Nb pads connecting a Nb nanostripe. As revealed by R vs T curves, and the superconductive transition is observed to be characterised by two regions: i) a first smooth and wide transition reflecting the continuous reduction in the width of the Nb triangular pads that progressively experience superconductive transition, and ii) a more abrupt transition reflecting the transition of the Nb nanostripe. This work could pave the way concerning the realisation of Nb nanostructures with tunable critical temperature, transition width, and slope.
{"title":"Geometry Dependent Superconductive Transition of Nb Nanostructures","authors":"Ivan De Carlo;Matteo Fretto;Natascia De Leo;Gianluca Milano","doi":"10.1109/TASC.2025.3546930","DOIUrl":"https://doi.org/10.1109/TASC.2025.3546930","url":null,"abstract":"Recently, superconducting nanostructures gained particular attention due to the visualisation of some intriguing phenomena, such as phase fluctuations, quantum phase slip, shape resonance in critical temperature, allowing the definition of a tailored superconducting nanodevice with the desired superconducting features, quantum phenomena. A deep investigation into the relationship between superconductivity, low dimensionality, quantum phenomena should be performed, in order to explain the emergence mechanism of these effects in nanostructures, how superconductivity is affected. In the following, we report on the investigation of the superconductive transition in triangular-shaped Nb pads connecting a Nb nanostripe. As revealed by <italic>R vs T</i> curves, and the superconductive transition is observed to be characterised by two regions: i) a first smooth and wide transition reflecting the continuous reduction in the width of the Nb triangular pads that progressively experience superconductive transition, and ii) a more abrupt transition reflecting the transition of the Nb nanostripe. This work could pave the way concerning the realisation of Nb nanostructures with tunable critical temperature, transition width, and slope.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143655098","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}
In response to increasing environmental regulations and the push towards electrification, superconducting motors have gained significant interest due to their high power density potential. This paper presents the design and analysis of a conceptual fully superconducting brushless motor featuring MgB$_{2}$ armature windings and YBCO bulk superconductors in the rotor. The proposed motor utilizes post-assembly magnetization using field cooling, achieving a trapped magnetic field exceeding 2 T. Through optimization and magnetization analysis, the YBCO bulk-type designed motor calculated a 61% improvement in power density compared to a permanent magnet-type designed motor. The design also shows thermal losses of 1.58 kW, which can be effectively covered using LH$_{2}$ cooling. These results present the feasibility of a high-performance, brushless design with HTS bulk field magnets, paving the way for relatively compact cryogenic motor applications.
{"title":"Design Study of Fully Superconducting Motor With MgB$_{2}$ Wire and YBCO Bulk Combination for Brushless Operation","authors":"Jaheum Koo;JuKyung Cha;Jonghoon Yoon;Wonseok Jang;Dongwoo Lee;In Gyeong Park;Sang Heon Lee;Seungyong Hahn;Sangjin Lee","doi":"10.1109/TASC.2025.3542340","DOIUrl":"https://doi.org/10.1109/TASC.2025.3542340","url":null,"abstract":"In response to increasing environmental regulations and the push towards electrification, superconducting motors have gained significant interest due to their high power density potential. This paper presents the design and analysis of a conceptual fully superconducting brushless motor featuring MgB<inline-formula><tex-math>$_{2}$</tex-math></inline-formula> armature windings and YBCO bulk superconductors in the rotor. The proposed motor utilizes post-assembly magnetization using field cooling, achieving a trapped magnetic field exceeding 2 T. Through optimization and magnetization analysis, the YBCO bulk-type designed motor calculated a 61% improvement in power density compared to a permanent magnet-type designed motor. The design also shows thermal losses of 1.58 kW, which can be effectively covered using LH<inline-formula><tex-math>$_{2}$</tex-math></inline-formula> cooling. These results present the feasibility of a high-performance, brushless design with HTS bulk field magnets, paving the way for relatively compact cryogenic motor applications.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143621613","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}
Quantum-limited noise amplifiers based on superconducting Josephson junction elements are essential components for measuring low-power signals in a wide range of applications. The gain bandwidth of a flux-pumped Josephson parametric amplifier can be broadened by coupling junction elements with an impedance-matching network. Well-known modeling methods for these amplifiers typically assume ideal lumped-element circuits for passive components, but often overlook unexpected resonant modes arising from the bulk geometric features. To address this challenge, flux-pumped junction elements can be simulated using finite-element analysis (FEA) combined with the pumpistor modeling method, which accurately accounts for the geometric features of arbitrary impedance-matching circuits. Here, we present a benchmark study using a circuit topology to compare different modeling methods: (1) the coupled mode network method, (2) the harmonic balance method, (3) the analytical pumpistor method, and (4) the FEA-assisted pumpistor method. Our results highlight the importance of accurately reflecting geometric features to prevent unexpected resonant modes and avoid detuning from the target flux bias values.
{"title":"Comparative Study of Numerical Modeling Methods for a Flux-Pumped Josephson Parametric Amplifier","authors":"Seong Hyeon Park;Gahyun Choi;Bokyung Kim;Gyunghun Kim;Yong-Ho Lee;Seungyong Hahn","doi":"10.1109/TASC.2025.3546921","DOIUrl":"https://doi.org/10.1109/TASC.2025.3546921","url":null,"abstract":"Quantum-limited noise amplifiers based on superconducting Josephson junction elements are essential components for measuring low-power signals in a wide range of applications. The gain bandwidth of a flux-pumped Josephson parametric amplifier can be broadened by coupling junction elements with an impedance-matching network. Well-known modeling methods for these amplifiers typically assume ideal lumped-element circuits for passive components, but often overlook unexpected resonant modes arising from the bulk geometric features. To address this challenge, flux-pumped junction elements can be simulated using finite-element analysis (FEA) combined with the pumpistor modeling method, which accurately accounts for the geometric features of arbitrary impedance-matching circuits. Here, we present a benchmark study using a circuit topology to compare different modeling methods: (1) the coupled mode network method, (2) the harmonic balance method, (3) the analytical pumpistor method, and (4) the FEA-assisted pumpistor method. Our results highlight the importance of accurately reflecting geometric features to prevent unexpected resonant modes and avoid detuning from the target flux bias values.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-6"},"PeriodicalIF":1.7,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143667268","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 : 2025-02-28DOI: 10.1109/TASC.2025.3543797
G. Succi;A. Ballarino;S. C. Hopkins;Y. Yang
Much information is lacking at present on the electrical properties of commercial REBCO tapes. This work, which builds on a previous paper of the same authors, presents the results of an experimental campaign aimed at deriving the critical current of tapes from SuperPower, Fujikura, Faraday Factory, and Shanghai Superconductor Technology. The campaign was conducted by applying both the transport method at 4.2 K, in perpendicular background magnetic fields of up to 15 T, and the magnetization method from 4.2 K up to the critical temperature in fields of up to 10 T. This latter method was adopted to determining the so-called crossover field, ${{B}_0}$, at which the transition from single vortex pinning to collective pinning takes place. ${{B}_0}$ is challenging to determine by the transport method because of the high currents involved (at 4.2 K, ${{B}_0}$ is roughly 1 T, which corresponds to currents above 1500 A, for a 4 mm tape). Magnetization measurements corroborate transport measurements at 4.2 K both below ${{B}_0}$ and up to 10 T. Further magnetization measurements above 4.2 K allow the temperature dependence of the scaling parameters to be derived, for correlation with the methodology of flux pinning enhancement by different manufacturers. This provides insights about the effectiveness and interplay of pinning mechanisms.
{"title":"Experimental Validation of a Scaling Law for the Critical Current of Commercial REBCO Tapes as a Function of Magnetic Field and Temperature","authors":"G. Succi;A. Ballarino;S. C. Hopkins;Y. Yang","doi":"10.1109/TASC.2025.3543797","DOIUrl":"https://doi.org/10.1109/TASC.2025.3543797","url":null,"abstract":"Much information is lacking at present on the electrical properties of commercial REBCO tapes. This work, which builds on a previous paper of the same authors, presents the results of an experimental campaign aimed at deriving the critical current of tapes from SuperPower, Fujikura, Faraday Factory, and Shanghai Superconductor Technology. The campaign was conducted by applying both the transport method at 4.2 K, in perpendicular background magnetic fields of up to 15 T, and the magnetization method from 4.2 K up to the critical temperature in fields of up to 10 T. This latter method was adopted to determining the so-called crossover field, <inline-formula><tex-math>${{B}_0}$</tex-math></inline-formula>, at which the transition from single vortex pinning to collective pinning takes place. <inline-formula><tex-math>${{B}_0}$</tex-math></inline-formula> is challenging to determine by the transport method because of the high currents involved (at 4.2 K, <inline-formula><tex-math>${{B}_0}$</tex-math></inline-formula> is roughly 1 T, which corresponds to currents above 1500 A, for a 4 mm tape). Magnetization measurements corroborate transport measurements at 4.2 K both below <inline-formula><tex-math>${{B}_0}$</tex-math></inline-formula> and up to 10 T. Further magnetization measurements above 4.2 K allow the temperature dependence of the scaling parameters to be derived, for correlation with the methodology of flux pinning enhancement by different manufacturers. This provides insights about the effectiveness and interplay of pinning mechanisms.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-9"},"PeriodicalIF":1.7,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654960","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 : 2025-02-27DOI: 10.1109/TASC.2025.3546555
Benjamin J. Taylor;Nicholas B. Ferrante;Sean T. Crowe;Ripan Barua;Susan A. E. Berggren
We introduce here a novel SQUID array design based upon the well-known Corbino geometry into which selected simple and/or complex physical (inductive and/or current flow) symmetries and asymmetries can be imposed. Via simulation, we analyze the resulting behavior of three simple 1D parallel Corbino SQA designs having perpendicular axes of symmetry and asymmetry with respect to the inductive properties of the individual SQUID elements. Through the Corbino geometry, it becomes possible to construct circuits having closed boundary conditions for the parallel rows and concentric rings connected in series. The work presented herein is intended to set the basis for investigating the potential use of this novel geometry in developing “right” and “left” hand sensitive 2D SQAs, improving linearity over standard 2D designs, as well as implementing designs having responses dependent upon asymmetry of the imposing field.
{"title":"SQUID Arrays in the Corbino Geometry","authors":"Benjamin J. Taylor;Nicholas B. Ferrante;Sean T. Crowe;Ripan Barua;Susan A. E. Berggren","doi":"10.1109/TASC.2025.3546555","DOIUrl":"https://doi.org/10.1109/TASC.2025.3546555","url":null,"abstract":"We introduce here a novel SQUID array design based upon the well-known Corbino geometry into which selected simple and/or complex physical (inductive and/or current flow) symmetries and asymmetries can be imposed. Via simulation, we analyze the resulting behavior of three simple 1D parallel Corbino SQA designs having perpendicular axes of symmetry and asymmetry with respect to the inductive properties of the individual SQUID elements. Through the Corbino geometry, it becomes possible to construct circuits having closed boundary conditions for the parallel rows and concentric rings connected in series. The work presented herein is intended to set the basis for investigating the potential use of this novel geometry in developing “right” and “left” hand sensitive 2D SQAs, improving linearity over standard 2D designs, as well as implementing designs having responses dependent upon asymmetry of the imposing field.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-7"},"PeriodicalIF":1.7,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143667391","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：