Pub Date : 2024-12-20DOI: 10.1109/TASC.2024.3521006
Yue Wu;Liye Xiao;Siyuan Han;Jiamin Chen
The magnetoresistance-superconducting composited magnetic sensor is a novel high-sensitivity weak magnetic sensor with significant application potential in fields such as biomedical science and geological exploration. However, the current superconducting flux concentrators face the issue of saturation in magnetic field amplification, which limits further improvement in the magnetic field resolution of the composited sensors. This article proposes a new type of magnetoresistance-superconducting-soft-magnetic composited sensor, which utilizes a superconducting planar gradient coil combined with soft magnetic plates to form a composite flux concentration structure. This design not only enhances the magnetic field amplification but also suppresses the interference of magnetic fields in nondetection directions. Theoretical simulations and experimental results indicate that the magnetic field sensitivity of this novel composited sensor is 3.2 times higher than that of magnetoresistance-superconducting composited sensors. This work is of great significance for the research on magnetoresistance sensors.
{"title":"High-Performance Magnetoresistance-Superconducting-Soft-Magnetic Composited Magnetic Sensor","authors":"Yue Wu;Liye Xiao;Siyuan Han;Jiamin Chen","doi":"10.1109/TASC.2024.3521006","DOIUrl":"https://doi.org/10.1109/TASC.2024.3521006","url":null,"abstract":"The magnetoresistance-superconducting composited magnetic sensor is a novel high-sensitivity weak magnetic sensor with significant application potential in fields such as biomedical science and geological exploration. However, the current superconducting flux concentrators face the issue of saturation in magnetic field amplification, which limits further improvement in the magnetic field resolution of the composited sensors. This article proposes a new type of magnetoresistance-superconducting-soft-magnetic composited sensor, which utilizes a superconducting planar gradient coil combined with soft magnetic plates to form a composite flux concentration structure. This design not only enhances the magnetic field amplification but also suppresses the interference of magnetic fields in nondetection directions. Theoretical simulations and experimental results indicate that the magnetic field sensitivity of this novel composited sensor is 3.2 times higher than that of magnetoresistance-superconducting composited sensors. This work is of great significance for the research on magnetoresistance sensors.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 2","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938219","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}
Aircraft equipment needs to maintain stable operation in low-temperature and low-pressure environments. This study assesses the feasibility of operating a developed machine under such conditions. Rotational tests were conducted in an environment that simulated the conditions required for aircraft-mounted equipment. The synchronous machine was installed in a thermostatic chamber that was set to a temperature of −55 °C and pressure of 11 kPa, which mimics the conditions at an altitude of 15,000 m. The machine demonstrated stable operation at a rotational speed of 180 rpm, with a field current of 50 A and an armature current amplitude of 100 A at a frequency of 3 Hz. The synchronous machine was tested in generator mode at ground level under no-load and three-phase short-circuit conditions to evaluate its rated operation under a normal environment. In the no-load test, the field current and rotational speed were increased from 10 A to 110 A and 100 rpm to 2,500 rpm, respectively, and the maximum line voltage was 590 V. In the three-phase short-circuit test, the U, V, and W phases exhibited maximum short-circuit currents of 490 A with a field current of 45 A and rotational speed of 100 rpm. These results confirm that the synchronous machine operated stably at 2,500 rpm with an output of 250 kW in generator mode. The stable performance of the machine under these conditions suggests its potential for enhancing the efficiency, power density, and reliability of electric propulsion systems in aviation.
{"title":"Performance Testing of 400 kW-Rated REBCO Superconducting Synchronous Machine in Low-Temperature and Low-Pressure Environments","authors":"H. Miyazaki;M. Iwakuma;Y. Emori;R. Konishi;K. Yoshida;S. Sato;H. Sasa;S. Miura;I. Sagara;Y. Suzuki;M. Konno;H. Hirai;A. Kawagoe;T. Izumi","doi":"10.1109/TASC.2024.3520532","DOIUrl":"https://doi.org/10.1109/TASC.2024.3520532","url":null,"abstract":"Aircraft equipment needs to maintain stable operation in low-temperature and low-pressure environments. This study assesses the feasibility of operating a developed machine under such conditions. Rotational tests were conducted in an environment that simulated the conditions required for aircraft-mounted equipment. The synchronous machine was installed in a thermostatic chamber that was set to a temperature of −55 °C and pressure of 11 kPa, which mimics the conditions at an altitude of 15,000 m. The machine demonstrated stable operation at a rotational speed of 180 rpm, with a field current of 50 A and an armature current amplitude of 100 A at a frequency of 3 Hz. The synchronous machine was tested in generator mode at ground level under no-load and three-phase short-circuit conditions to evaluate its rated operation under a normal environment. In the no-load test, the field current and rotational speed were increased from 10 A to 110 A and 100 rpm to 2,500 rpm, respectively, and the maximum line voltage was 590 V. In the three-phase short-circuit test, the U, V, and W phases exhibited maximum short-circuit currents of 490 A with a field current of 45 A and rotational speed of 100 rpm. These results confirm that the synchronous machine operated stably at 2,500 rpm with an output of 250 kW in generator mode. The stable performance of the machine under these conditions suggests its potential for enhancing the efficiency, power density, and reliability of electric propulsion systems in aviation.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938162","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 : 2024-12-19DOI: 10.1109/TASC.2024.3520079
V. Reynaud;S. Farinon;M. Janitschke;E. Ravaioli;A.P. Verweij;G. Willering;U. van Rienen
Electrical short-circuits in the coil winding pack of a superconducting magnet can severely impact the magnet's performance and safety during operation. Hence, finding ways to detect and assess these non-conformities is essential. Measurements of the complex impedance as a function of the frequency are a promising method to investigate such non-conformities more closely. The complex impedance of one HL-LHC recombination dipole magnet was recently measured at the CERN magnet test facility. Moreover, to mimic an inter-turn short in the coils, resistances at warm were connected externally to the voltage taps and the complex impedance of the magnet was measured. The acquired measurements are used to validate a developed lumped-element network model, reproducing the electromagnetic behaviour of the HL-LHC recombination dipole magnet in the frequency domain. The simulation results are compared to the measurements without artificial short circuits and are in good agreement up to a frequency of 10 kHz. The simulated effects of short circuits across a few turns in the frequency domain are compared to the measurements performed on the magnet. Since good agreement between measurements and simulations was obtained, these models can be used to predict the electromagnetic effects of any inter-turn short in the HL-LHC recombination dipole magnet or similar types of accelerator magnets.
{"title":"Evaluating the Electro-Magnetic Effects of Electrical Short-Circuits in a Nb-Ti Accelerator Magnet","authors":"V. Reynaud;S. Farinon;M. Janitschke;E. Ravaioli;A.P. Verweij;G. Willering;U. van Rienen","doi":"10.1109/TASC.2024.3520079","DOIUrl":"https://doi.org/10.1109/TASC.2024.3520079","url":null,"abstract":"Electrical short-circuits in the coil winding pack of a superconducting magnet can severely impact the magnet's performance and safety during operation. Hence, finding ways to detect and assess these non-conformities is essential. Measurements of the complex impedance as a function of the frequency are a promising method to investigate such non-conformities more closely. The complex impedance of one HL-LHC recombination dipole magnet was recently measured at the CERN magnet test facility. Moreover, to mimic an inter-turn short in the coils, resistances at warm were connected externally to the voltage taps and the complex impedance of the magnet was measured. The acquired measurements are used to validate a developed lumped-element network model, reproducing the electromagnetic behaviour of the HL-LHC recombination dipole magnet in the frequency domain. The simulation results are compared to the measurements without artificial short circuits and are in good agreement up to a frequency of 10 kHz. The simulated effects of short circuits across a few turns in the frequency domain are compared to the measurements performed on the magnet. Since good agreement between measurements and simulations was obtained, these models can be used to predict the electromagnetic effects of any inter-turn short in the HL-LHC recombination dipole magnet or similar types of accelerator magnets.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10807401","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938204","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}
To further explore the physics beyond the capabilities of the LHC and its High-Luminosity Upgrade (HL-LHC), particle physicists are studying advanced accelerators in order to perform finer measurements and/or reach higher energies. Upon the recommendation of the Updated European Strategy for Particle Physics (ESPP), an International Muon Collider Collaboration has been established to investigate the feasibility of a muon collider facility with a center-of-mass energy of 10 TeV. This endeavor is confronted with several technical challenges, primarily arising from the brief muon lifetime at rest, which is only 2.2 ${mu }$ s. Addressing this stringent constraint necessitates the deployment of innovative technologies, including challengingmagnets, RF systems, targets, shielding, and cooling methodologies. This paper focuses on optimizing the electromagnetic and mechanical aspects of high-temperature superconducting (HTS) dipoles with large rectangular aperture for the accelerator ring, with a bore field up to 10 T, using finite element techniques. The objectives include ensuring a precise control over magnetic field uniformity and a preliminary evaluation of the mechanical behaviour of the HTS coils. The study is aligned with the priority set by ESPP on technological advancements, notably in high-field superconducting magnets, crucial components for any forthcoming circular collider.
{"title":"Magnetic and Mechanical Design of the Large Aperture HTS Superconducting Dipoles for the Accelerator Ring of the Muon Collider","authors":"F. Levi;L. Alfonso;L. Balconi;A. Bersani;L. Bottura;B. Caiffi;S. Fabbri;S. Farinon;A. Gagno;T. Maiello;F. Mariani;S. Mariotto;D. Novelli;A. Pampaloni;C. Santini;S. Sorti;M. Statera","doi":"10.1109/TASC.2024.3520073","DOIUrl":"https://doi.org/10.1109/TASC.2024.3520073","url":null,"abstract":"To further explore the physics beyond the capabilities of the LHC and its High-Luminosity Upgrade (HL-LHC), particle physicists are studying advanced accelerators in order to perform finer measurements and/or reach higher energies. Upon the recommendation of the Updated European Strategy for Particle Physics (ESPP), an International Muon Collider Collaboration has been established to investigate the feasibility of a muon collider facility with a center-of-mass energy of 10 TeV. This endeavor is confronted with several technical challenges, primarily arising from the brief muon lifetime at rest, which is only 2.2 \u0000<inline-formula><tex-math>${mu }$</tex-math></inline-formula>\u0000s. Addressing this stringent constraint necessitates the deployment of innovative technologies, including challengingmagnets, RF systems, targets, shielding, and cooling methodologies. This paper focuses on optimizing the electromagnetic and mechanical aspects of high-temperature superconducting (HTS) dipoles with large rectangular aperture for the accelerator ring, with a bore field up to 10 T, using finite element techniques. The objectives include ensuring a precise control over magnetic field uniformity and a preliminary evaluation of the mechanical behaviour of the HTS coils. The study is aligned with the priority set by ESPP on technological advancements, notably in high-field superconducting magnets, crucial components for any forthcoming circular collider.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142940924","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 : 2024-12-19DOI: 10.1109/TASC.2024.3520080
E. Bianchi;S. Farinon;E. Felcini;A. Gagno;L. Gentini;I. Georgiadis;E. O. Kavoura;C. Kokkinos;F. Levi;R. Musenich;A. Pampaloni;D. Perini;M. Prioli;M. Pullia;L. Rossi;C. Santini;R. U. Valente
In ion therapy, gantries play a crucial role in minimizing damage to healthy tissue and enabling treatment from diverse angles. The introduction of superconducting magnets results in a substantial reduction in the overall weight and the power required to operate of these otherwise huge structures. The Superconducting Ion Gantry (SIG) project represents the contribution of INFN (Istituto Nazionale di Fisica Nucleare) to the EuroSIG collaboration, which includes CERN, CNAO (Centro Nazionale di Adroterapia Oncologica), and MedAustron. The primary goal is to design, manufacture, and test a demonstrator for a curved superconducting dipole with costheta-type NbTi coils for a 430 MeV/u carbon ion gantry. The magnet is designed with a 1.65 m radius of curvature and an 80 mm aperture, aiming to generate a magnetic field up to 4 T, with a ramp rate of about 0.4 T/s, without the option of utilizing a direct cooling system. The winding, assembly, and testing of the magnet will be carried out in Milan, at LASA (Laboratorio Acceleratori e Superconduttività Applicata). However, the available press is insufficient in size compared to the dimensions of the magnet. To overcome this limitation, an alternative method has been devised for the assembly of the iron yoke, relying on a steel system of clamps and vertical tie rods. These clamps have the purpose of securely fastening the two yoke halves together. This study presents the final design of the mechanical structure cross-section, derived through finite element analyses, highlighting the optimization of mechanical contacts between components while adhering to structural limits. Additionally, a preliminary 3D design based on this optimized cross-section is introduced.
{"title":"Consolidated 2D Mechanical Design and Preliminary 3D Design Phase of the Superconducting Ion Gantry (SIG) Dipole for Hadrontherapy","authors":"E. Bianchi;S. Farinon;E. Felcini;A. Gagno;L. Gentini;I. Georgiadis;E. O. Kavoura;C. Kokkinos;F. Levi;R. Musenich;A. Pampaloni;D. Perini;M. Prioli;M. Pullia;L. Rossi;C. Santini;R. U. Valente","doi":"10.1109/TASC.2024.3520080","DOIUrl":"https://doi.org/10.1109/TASC.2024.3520080","url":null,"abstract":"In ion therapy, gantries play a crucial role in minimizing damage to healthy tissue and enabling treatment from diverse angles. The introduction of superconducting magnets results in a substantial reduction in the overall weight and the power required to operate of these otherwise huge structures. The Superconducting Ion Gantry (SIG) project represents the contribution of INFN (Istituto Nazionale di Fisica Nucleare) to the EuroSIG collaboration, which includes CERN, CNAO (Centro Nazionale di Adroterapia Oncologica), and MedAustron. The primary goal is to design, manufacture, and test a demonstrator for a curved superconducting dipole with costheta-type NbTi coils for a 430 MeV/u carbon ion gantry. The magnet is designed with a 1.65 m radius of curvature and an 80 mm aperture, aiming to generate a magnetic field up to 4 T, with a ramp rate of about 0.4 T/s, without the option of utilizing a direct cooling system. The winding, assembly, and testing of the magnet will be carried out in Milan, at LASA (Laboratorio Acceleratori e Superconduttività Applicata). However, the available press is insufficient in size compared to the dimensions of the magnet. To overcome this limitation, an alternative method has been devised for the assembly of the iron yoke, relying on a steel system of clamps and vertical tie rods. These clamps have the purpose of securely fastening the two yoke halves together. This study presents the final design of the mechanical structure cross-section, derived through finite element analyses, highlighting the optimization of mechanical contacts between components while adhering to structural limits. Additionally, a preliminary 3D design based on this optimized cross-section is introduced.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142940916","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 : 2024-12-19DOI: 10.1109/TASC.2024.3520099
Uijong Bong;Thanatheepan Balachandran;Yiming Zhao;Kiruba S. Haran
Cryogen-free ultra-high field superconducting electric motor (CRUISE Motor) project, initiated in 2022 with ARPA-E funding, aims to develop a 10 MW, 3000 rpm machine with a power density exceeding 40 kW/kg. This paper presents a detailed progress report on the field winding development as part of the CRUISE motor project. To achieve the motor's high power density target, a field winding consisting of two no-insulation (NI) REBCO double pancake racetrack coils per pole was designed, aiming for an operating conductor current density of 500 A/mm $^{2}$ at 50 K. As part of the experimental validation, prototype racetrack coils were fabricated using an in-house winding machine and tested at both 50 K and 77 K. Based on the insights gained from the prototype coils, the coil designs were further refined and applied to the full-scale racetrack coil design. Additionally, the quench behavior of the prototype coil was experimentally investigated to verify its robustness under fault conditions.
{"title":"No-Insulation REBCO Field Winding Assembly for CRUISE Motor","authors":"Uijong Bong;Thanatheepan Balachandran;Yiming Zhao;Kiruba S. Haran","doi":"10.1109/TASC.2024.3520099","DOIUrl":"https://doi.org/10.1109/TASC.2024.3520099","url":null,"abstract":"Cryogen-free ultra-high field superconducting electric motor (CRUISE Motor) project, initiated in 2022 with ARPA-E funding, aims to develop a 10 MW, 3000 rpm machine with a power density exceeding 40 kW/kg. This paper presents a detailed progress report on the field winding development as part of the CRUISE motor project. To achieve the motor's high power density target, a field winding consisting of two no-insulation (NI) REBCO double pancake racetrack coils per pole was designed, aiming for an operating conductor current density of 500 A/mm\u0000<inline-formula><tex-math>$^{2}$</tex-math></inline-formula>\u0000 at 50 K. As part of the experimental validation, prototype racetrack coils were fabricated using an in-house winding machine and tested at both 50 K and 77 K. Based on the insights gained from the prototype coils, the coil designs were further refined and applied to the full-scale racetrack coil design. Additionally, the quench behavior of the prototype coil was experimentally investigated to verify its robustness under fault conditions.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142905777","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}
Fully superconducting rotating machines with superconducting armature and field coils hold significant potential as electric propulsion systems for aircraft owing to their high power density (kg/kW). To support large current capacities in the superconducting armature coils of these motors, a multi-strand parallel conductor design was developed. Further, this study aimed to develop an optimum conductor design capable of incorporating any number of parallel conductors. To achieve this, three-strand parallel conductors were used. It was demonstrated that a uniform current distribution can be achieved using a novel transposition method within the winding. Herein, the winding process for this transposition method was developed to apply the desired configuration. The experimentally obtained current distributions of 33.4%, 35.2%, and 31.4% confirm the effectiveness of this method.
{"title":"Experimental Evaluation of Transposed Three-Parallel Conductors to Achieve Uniform Current in Armature Coils of Superconducting Motors","authors":"Goki Kawasaki;Kazuki Nakamura;Yudai Kimura;Tomohiro Inoue;Yohei Masuda;Shun Miura;Hiroshi Miyazaki;Akifumi Kawagoe;Masataka Iwakuma","doi":"10.1109/TASC.2024.3520549","DOIUrl":"https://doi.org/10.1109/TASC.2024.3520549","url":null,"abstract":"Fully superconducting rotating machines with superconducting armature and field coils hold significant potential as electric propulsion systems for aircraft owing to their high power density (kg/kW). To support large current capacities in the superconducting armature coils of these motors, a multi-strand parallel conductor design was developed. Further, this study aimed to develop an optimum conductor design capable of incorporating any number of parallel conductors. To achieve this, three-strand parallel conductors were used. It was demonstrated that a uniform current distribution can be achieved using a novel transposition method within the winding. Herein, the winding process for this transposition method was developed to apply the desired configuration. The experimentally obtained current distributions of 33.4%, 35.2%, and 31.4% confirm the effectiveness of this method.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938163","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 : 2024-12-18DOI: 10.1109/TASC.2024.3520092
Weican Huang;Xiaohua Jiang;Guolin Chai;Xianrui Huang;Qingyu Zou;Ye Li
A 14 T actively shielded animal MRI magnet has been designed and is currently under construction. The magnet has a warm bore of 175 mm diameter and consists of Nb 3 Sn and NbTi solenoid coils. This paper presents the results of electromagnetic, structural and quench protection designs of the magnet. The magnetic field homogeneity is 0.9 ppm within a 60 mm diameter of spherical volume. The distance of 5 Gauss line from the magnet center is 2.4 m radially and 2.9 m axially. Stress analysis shows that the maximum axial and circumferential stresses in the coils are −73 MPa and 144 MPa, respectively. Under the worst quench scenarios, the maximum hotspot temperature and inter-layer voltage in the coils are constrained to 169 K and 720 V, respectively.
{"title":"Design of a 14 T Actively Shielded Superconducting Magnet for Animal MRI","authors":"Weican Huang;Xiaohua Jiang;Guolin Chai;Xianrui Huang;Qingyu Zou;Ye Li","doi":"10.1109/TASC.2024.3520092","DOIUrl":"https://doi.org/10.1109/TASC.2024.3520092","url":null,"abstract":"A 14 T actively shielded animal MRI magnet has been designed and is currently under construction. The magnet has a warm bore of 175 mm diameter and consists of Nb\u0000<sub>3</sub>\u0000Sn and NbTi solenoid coils. This paper presents the results of electromagnetic, structural and quench protection designs of the magnet. The magnetic field homogeneity is 0.9 ppm within a 60 mm diameter of spherical volume. The distance of 5 Gauss line from the magnet center is 2.4 m radially and 2.9 m axially. Stress analysis shows that the maximum axial and circumferential stresses in the coils are −73 MPa and 144 MPa, respectively. Under the worst quench scenarios, the maximum hotspot temperature and inter-layer voltage in the coils are constrained to 169 K and 720 V, respectively.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142912480","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}
For particle accelerator-based light sources, there is ongoing interest in high-temperature superconducting (HTS) undulators utilizing Rare Earth-Ba-Cu-O (REBCO) coated conductors for their higher critical temperature ( T c ) and superior critical current density ( J c ) compared to Nb-Ti or Nb 3 Sn round wires. These characteristics facilitate the development of undulators with shorter period and higher on-axis magnetic field, while also offering a larger temperature margin to accommodate the heat load. However, the screening current induced field (SCIF) and the hysteresis between the on-axis undulator field and the input current remains a significant challenge for practical applications. In this paper, we employed the H -formulation method to develop 2D periodic undulator models with a fixed period of 12 mm and numerically analyzed the SCIF effect on both vertical and horizontal racetrack coils-based REBCO planar undulators. Our analysis reveals that the SCIF effect can significantly distort the on-axis magnetic field, especially when the REBCO tape is wide or the undulator features a small magnetic gap. We present optimal design parameters for both types of 12 mm-period HTS undulators and provide operational guidelines concerning input currents.
{"title":"Electromagnetic Modeling of RE-Ba-Cu-O Coils Based Superconducting Planar Undulator and Study on Its Screening Current Induced Field","authors":"Zhuangwei Chen;Dabin Wei;Xiaotong Cui;Difan Zhou;Kai Zhang;Zhentang Zhao","doi":"10.1109/TASC.2024.3519298","DOIUrl":"https://doi.org/10.1109/TASC.2024.3519298","url":null,"abstract":"For particle accelerator-based light sources, there is ongoing interest in high-temperature superconducting (HTS) undulators utilizing Rare Earth-Ba-Cu-O (REBCO) coated conductors for their higher critical temperature (\u0000<italic>T</i>\u0000<sub>c</sub>\u0000) and superior critical current density (\u0000<italic>J</i>\u0000<sub>c</sub>\u0000) compared to Nb-Ti or Nb\u0000<sub>3</sub>\u0000Sn round wires. These characteristics facilitate the development of undulators with shorter period and higher on-axis magnetic field, while also offering a larger temperature margin to accommodate the heat load. However, the screening current induced field (SCIF) and the hysteresis between the on-axis undulator field and the input current remains a significant challenge for practical applications. In this paper, we employed the \u0000<italic>H</i>\u0000-formulation method to develop 2D periodic undulator models with a fixed period of 12 mm and numerically analyzed the SCIF effect on both vertical and horizontal racetrack coils-based REBCO planar undulators. Our analysis reveals that the SCIF effect can significantly distort the on-axis magnetic field, especially when the REBCO tape is wide or the undulator features a small magnetic gap. We present optimal design parameters for both types of 12 mm-period HTS undulators and provide operational guidelines concerning input currents.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142940917","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 : 2024-12-18DOI: 10.1109/TASC.2024.3520094
Ao Shimada;Atsushi Ishiyama;Tsun Him Chong;Mitsuhiro Fukuda;So Noguchi;Hiroshi Ueda
We are developing a high-temperature superconducting skeleton cyclotron (HTS-SC), that is, an ultracompact, high-intensity accelerator. The coil system of the skeleton cyclotron consists of air-core no-insulation (NI) REBCO coils without an iron core, which is conventionally adopted, and can allow variable output energy. In parallel, we have been developing an NI-REBCO coil system for the electron cyclotron resonance ion source for the HTS-SC. It is necessary to change the magnetic-field configuration according to the operation frequencies: 2.45 and 10 GHz. Although both high thermal stability and high current density can be achieved by adopting NI-REBCO winding technology, the screening current-induced in the REBCO-coated conductor generates an irregular magnetic field. In addition, there is an excitation delay caused by a current flowing in the radial direction with coil excitation in the NI coil winding, which reduces the magnetic-field accuracy. In this paper, we focus on the accuracy of the spatial distribution of the generated magnetic field and present the results of evaluations based on experiments and numerical analysis. A newly developed screening current-induced field analysis method for NI-REBCO coils based only on circuit analysis was used for numerical simulations.
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