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Cryogenic C-Band Hybrid MMIC Low-Noise Amplifier Using HTS Input Matching Network Assisted by Gray Wolf Optimizer
IF 1.7 3区 物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-12-11 DOI: 10.1109/TASC.2024.3514608
Hongliang Tian;Haiwen Liu;Zeren Song;Yulian Xu;Ruolin Wang;Shaofei Wang
In this article, a cryogenic 4–8-GHz hybrid monolithic microwave integrated circuit (MMIC) low-noise amplifier (LNA), enhanced with an external high-temperature superconductor (HTS) impedance matching network (IMN), is proposed. It evolves from a reference InP MMIC LNA by substituting the on-chip IMN with an external HTS IMN, facilitating seamless integration with superconductor circuit units. The Gray Wolf Optimization algorithm is utilized to optimize the IMN. Compared with the reference MMIC LNA, the hybrid MMIC LNA exhibits an average noise reduction of approximately 5.2 K at 77 K and 1.9 K at 15 K during testing. These results make it a promising candidate for applications in superconductor receivers.
{"title":"Cryogenic C-Band Hybrid MMIC Low-Noise Amplifier Using HTS Input Matching Network Assisted by Gray Wolf Optimizer","authors":"Hongliang Tian;Haiwen Liu;Zeren Song;Yulian Xu;Ruolin Wang;Shaofei Wang","doi":"10.1109/TASC.2024.3514608","DOIUrl":"https://doi.org/10.1109/TASC.2024.3514608","url":null,"abstract":"In this article, a cryogenic 4–8-GHz hybrid monolithic microwave integrated circuit (MMIC) low-noise amplifier (LNA), enhanced with an external high-temperature superconductor (HTS) impedance matching network (IMN), is proposed. It evolves from a reference InP MMIC LNA by substituting the on-chip IMN with an external HTS IMN, facilitating seamless integration with superconductor circuit units. The Gray Wolf Optimization algorithm is utilized to optimize the IMN. Compared with the reference MMIC LNA, the hybrid MMIC LNA exhibits an average noise reduction of approximately 5.2 K at 77 K and 1.9 K at 15 K during testing. These results make it a promising candidate for applications in superconductor receivers.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 2","pages":"1-7"},"PeriodicalIF":1.7,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142905706","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
Fabrication and Evaluation of Waveguide Josephson Array Oscillators at Millimeter-Wave Lengths for SIS Mixer-Based Amplifiers
IF 1.7 3区 物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-12-11 DOI: 10.1109/TASC.2024.3515971
Yosuke Murayama;Akira Kawakami;Wenlei Shan;Shohei Ezaki;Akihira Miyachi;Sho Masui;Takafumi Kojima;Yoshinori Uzawa
In this study, a 150 GHz waveguide Josephson array oscillator was designed, fabricated, and evaluated as a local oscillator (LO) source for superconductor-insulator-superconductor (SIS) mixer-based amplifiers. These amplifiers aim to reduce the power consumption of microwave amplifiers used in large-scale multi-pixel heterodyne receivers for radio astronomy and superconducting quantum computers. We fabricated a Josephson array oscillator of 11 Nb/Al–AlOx/Nb Josephson junctions with Cu shunt resistors, each of which is placed on the center of a half-wavelength microstrip line resonator. When the LO signal from the oscillator was introduced into the balanced SIS mixers via a waveguide, the oscillator successfully pumped four SIS mixers simultaneously, delivering a total estimated LO power of 0.22 µW at 146.7 GHz. The SIS mixers operated without a millimeter-wave isolator at an LO noise temperature of 4–6 K. These results indicate the Josephson array oscillator's potential as an LO source for SIS mixer-based amplifiers.
{"title":"Fabrication and Evaluation of Waveguide Josephson Array Oscillators at Millimeter-Wave Lengths for SIS Mixer-Based Amplifiers","authors":"Yosuke Murayama;Akira Kawakami;Wenlei Shan;Shohei Ezaki;Akihira Miyachi;Sho Masui;Takafumi Kojima;Yoshinori Uzawa","doi":"10.1109/TASC.2024.3515971","DOIUrl":"https://doi.org/10.1109/TASC.2024.3515971","url":null,"abstract":"In this study, a 150 GHz waveguide Josephson array oscillator was designed, fabricated, and evaluated as a local oscillator (LO) source for superconductor-insulator-superconductor (SIS) mixer-based amplifiers. These amplifiers aim to reduce the power consumption of microwave amplifiers used in large-scale multi-pixel heterodyne receivers for radio astronomy and superconducting quantum computers. We fabricated a Josephson array oscillator of 11 Nb/Al–AlO\u0000<sub>x</sub>\u0000/Nb Josephson junctions with Cu shunt resistors, each of which is placed on the center of a half-wavelength microstrip line resonator. When the LO signal from the oscillator was introduced into the balanced SIS mixers via a waveguide, the oscillator successfully pumped four SIS mixers simultaneously, delivering a total estimated LO power of 0.22 µW at 146.7 GHz. The SIS mixers operated without a millimeter-wave isolator at an LO noise temperature of 4–6 K. These results indicate the Josephson array oscillator's potential as an LO source for SIS mixer-based amplifiers.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-6"},"PeriodicalIF":1.7,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142880427","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
Quasi-Lumped Coplanar Waveguide Diplexers for a Multichroic Polarimeter
IF 1.7 3区 物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-12-11 DOI: 10.1109/TASC.2024.3514596
Sirui Ren;Tian Xia;Shiling Yu;Yu Wang;Mingzhu Zhang;Yuxin Qiu;Xiaohui Yan;Ruirui Fan;Xucheng Dai;Zhanzhang Mai;Zhongyu Shi;Yue Hong;Liming Zou;Haitao Wang;Hongli Zhu;Jiawei Liu;Haoyu Wang;Weijie Guo;Yiwen Wang;Yanru Song;Xiaohang Zhang;Ran Duan
This article presents a multichroic Kinetic Inductance Bolometer (KIB) polarimeter that utilizes coplanar waveguide (CPW) diplexers. The CPW diplexers function as filters, providing two passbands centered at 220 GHz and 280 GHz. The high-quality-factor resonant units deliver excellent transmission and isolation characteristics. Additionally, the quasi-lumped-element resonator design enables a significant reduction in size compared to conventional microstrip diplexers. The entire polarimeter—comprising orthomode transducer (OMT) probes, diplexers, KIBs, and CPW feed lines—is integrated on a single plane, allowing for one-layer superconducting thin-film fabrication with a simplified process. The compact size, superior frequency response, and streamlined fabrication process make the proposed pixel scheme suitable for integrated array development.
{"title":"Quasi-Lumped Coplanar Waveguide Diplexers for a Multichroic Polarimeter","authors":"Sirui Ren;Tian Xia;Shiling Yu;Yu Wang;Mingzhu Zhang;Yuxin Qiu;Xiaohui Yan;Ruirui Fan;Xucheng Dai;Zhanzhang Mai;Zhongyu Shi;Yue Hong;Liming Zou;Haitao Wang;Hongli Zhu;Jiawei Liu;Haoyu Wang;Weijie Guo;Yiwen Wang;Yanru Song;Xiaohang Zhang;Ran Duan","doi":"10.1109/TASC.2024.3514596","DOIUrl":"https://doi.org/10.1109/TASC.2024.3514596","url":null,"abstract":"This article presents a multichroic Kinetic Inductance Bolometer (KIB) polarimeter that utilizes coplanar waveguide (CPW) diplexers. The CPW diplexers function as filters, providing two passbands centered at 220 GHz and 280 GHz. The high-quality-factor resonant units deliver excellent transmission and isolation characteristics. Additionally, the quasi-lumped-element resonator design enables a significant reduction in size compared to conventional microstrip diplexers. The entire polarimeter—comprising orthomode transducer (OMT) probes, diplexers, KIBs, and CPW feed lines—is integrated on a single plane, allowing for one-layer superconducting thin-film fabrication with a simplified process. The compact size, superior frequency response, and streamlined fabrication process make the proposed pixel scheme suitable for integrated array development.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142875134","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
Intelligent and Application-Oriented Optimal Design of Travelling Field Flux Pumps
IF 1.7 3区 物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-12-11 DOI: 10.1109/TASC.2024.3509405
Giacomo Russo;Mohammad Yazdani-Asrami;Massimo Fabbri;Antonio Morandi
Flux pumping based on traveling field is a promising technology, potentially able to produce breakthrough innovation in the supply of HTS magnets, which offers a contactless, low-voltage, and high-current alternative to power electronics exciters and current leads solutions. However, their engineering process has proved to present major challenges. Previous studies have empirically investigated, either numerically or experimentally, the impact of individual design parameters on the outputs and performance of flux pumps, but they were only able to provide qualitative relations that are not suitable for proper designing actions. In this study, we propose a new approach based on artificial intelligence (AI) techniques to generate effective flux pump designs. A finite element (FE) model, previously validated against experimental results, was employed in this procedure to provide a relation between the design parameters of the flux pump and the objective function of the optimization problem, that is the maximum efficiency during persistent operation. The FE model is exploited in the form of a function that is fed into AI-based optimization algorithms such as the genetic algorithm and the particle swarm optimization. The established procedure offers a “systematic” method for the design of viable and efficient flux pumps for contactless energization HTS magnets in real applications.
{"title":"Intelligent and Application-Oriented Optimal Design of Travelling Field Flux Pumps","authors":"Giacomo Russo;Mohammad Yazdani-Asrami;Massimo Fabbri;Antonio Morandi","doi":"10.1109/TASC.2024.3509405","DOIUrl":"https://doi.org/10.1109/TASC.2024.3509405","url":null,"abstract":"Flux pumping based on traveling field is a promising technology, potentially able to produce breakthrough innovation in the supply of HTS magnets, which offers a contactless, low-voltage, and high-current alternative to power electronics exciters and current leads solutions. However, their engineering process has proved to present major challenges. Previous studies have empirically investigated, either numerically or experimentally, the impact of individual design parameters on the outputs and performance of flux pumps, but they were only able to provide qualitative relations that are not suitable for proper designing actions. In this study, we propose a new approach based on artificial intelligence (AI) techniques to generate effective flux pump designs. A finite element (FE) model, previously validated against experimental results, was employed in this procedure to provide a relation between the design parameters of the flux pump and the objective function of the optimization problem, that is the maximum efficiency during persistent operation. The FE model is exploited in the form of a function that is fed into AI-based optimization algorithms such as the genetic algorithm and the particle swarm optimization. The established procedure offers a “systematic” method for the design of viable and efficient flux pumps for contactless energization HTS magnets in real applications.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10789172","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142905745","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
Comparison of Jc Characteristics Among (Ba,Na)Fe2As2 Wires and Tapes Fabricated by Different Methods
IF 1.7 3区 物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-12-11 DOI: 10.1109/TASC.2024.3513284
T. Tamegai;R. Sakagami;T. Ito;K Takinoiri;A. Kikuchi;M. Yamamoto
In the present study, critical current density (Jc) characteristics and uniformity of (Ba,Na)Fe2As2 wires and tapes fabricated by different methods and sheath materials are compared. Impurity-free high-quality polycrystalline powders were prepared by two different methods; direct reaction method and precursor method. By optimizing the heat treatment temperature and holding time of precursors, we have succeeded in obtaining high-quality precursor powders. In the case of wire drawing, a rotary swager with an automatic wire feeder is used to prevent sausaging. By using a roller, the wire was further deform into a tape form. In addition to the Jc characteristics of (Ba,Na)Fe2As2 wire and tapes, X-ray characterizations for the evaluation of texturing and uniformity are presented. Finally, a fine and long (Ba,Na)Fe2As2 wire is fabricated using Monel as an outer sheath material, and its characteristics are presented.
{"title":"Comparison of Jc Characteristics Among (Ba,Na)Fe2As2 Wires and Tapes Fabricated by Different Methods","authors":"T. Tamegai;R. Sakagami;T. Ito;K Takinoiri;A. Kikuchi;M. Yamamoto","doi":"10.1109/TASC.2024.3513284","DOIUrl":"https://doi.org/10.1109/TASC.2024.3513284","url":null,"abstract":"In the present study, critical current density (\u0000<italic>J</i>\u0000<sub>c</sub>\u0000) characteristics and uniformity of (Ba,Na)Fe\u0000<sub>2</sub>\u0000As\u0000<sub>2</sub>\u0000 wires and tapes fabricated by different methods and sheath materials are compared. Impurity-free high-quality polycrystalline powders were prepared by two different methods; direct reaction method and precursor method. By optimizing the heat treatment temperature and holding time of precursors, we have succeeded in obtaining high-quality precursor powders. In the case of wire drawing, a rotary swager with an automatic wire feeder is used to prevent sausaging. By using a roller, the wire was further deform into a tape form. In addition to the \u0000<italic>J</i>\u0000<sub>c</sub>\u0000 characteristics of (Ba,Na)Fe\u0000<sub>2</sub>\u0000As\u0000<sub>2</sub>\u0000 wire and tapes, X-ray characterizations for the evaluation of texturing and uniformity are presented. Finally, a fine and long (Ba,Na)Fe\u0000<sub>2</sub>\u0000As\u0000<sub>2</sub>\u0000 wire is fabricated using Monel as an outer sheath material, and its characteristics are presented.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142890325","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
Dynamic Electromagnetic Response of D-Shaped No-Insulation Coil Under Pulse Background Field
IF 1.7 3区 物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-12-11 DOI: 10.1109/TASC.2024.3515954
Xueliang Wang;Jie Sheng;Xiao-Fen Li;Shuhao Peng;Zhijian Jin
REBCO is a representative commercial High Temperature Superconducting (HTS) material. It has great potential for high field applications for instance Tokamak. REBCO is a 2D film with anisotropy. When using tape to wind no-insulation (NI) coil for Toroidal Field (TF) magnet, the thermal stability is guaranteed. However, the Central Solenoid (CS) and Poloidal Field (PF) magnet is working with dynamic pulse field, which may affect the TF magnet. The pulse field perpendicular to the tape of TF magnet can lead screening current or critical current (IC) degradation. In this article, a 58*2 turns D-shaped NI is fabricated as TF magnet. The pulse background field, provided by insulation solenoid coil, is applied on coil to find out its dynamic response at 77 K. Multiple voltage taps are used to monitor the local behavior of NI coil. And high-speed data acquisition system is installed to measure the local voltage. In the results, a typical non-zero voltage is observed.
{"title":"Dynamic Electromagnetic Response of D-Shaped No-Insulation Coil Under Pulse Background Field","authors":"Xueliang Wang;Jie Sheng;Xiao-Fen Li;Shuhao Peng;Zhijian Jin","doi":"10.1109/TASC.2024.3515954","DOIUrl":"https://doi.org/10.1109/TASC.2024.3515954","url":null,"abstract":"REBCO is a representative commercial High Temperature Superconducting (HTS) material. It has great potential for high field applications for instance Tokamak. REBCO is a 2D film with anisotropy. When using tape to wind no-insulation (NI) coil for Toroidal Field (TF) magnet, the thermal stability is guaranteed. However, the Central Solenoid (CS) and Poloidal Field (PF) magnet is working with dynamic pulse field, which may affect the TF magnet. The pulse field perpendicular to the tape of TF magnet can lead screening current or critical current (I\u0000<sub>C</sub>\u0000) degradation. In this article, a 58*2 turns D-shaped NI is fabricated as TF magnet. The pulse background field, provided by insulation solenoid coil, is applied on coil to find out its dynamic response at 77 K. Multiple voltage taps are used to monitor the local behavior of NI coil. And high-speed data acquisition system is installed to measure the local voltage. In the results, a typical non-zero voltage is observed.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142875082","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
Effects on the Magnetic Field Stability of Coupling Currents Existing in a Two-Tape Bundle of a HTS Insert Prototype
IF 1.7 3区 物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-12-11 DOI: 10.1109/TASC.2024.3514994
A. Zampa;Y. Tsuchiya;K. Takahashi;T. Okada;S. Awaji;T. Uto;H. Takewa;S. Hanai;S. Ioka;J. Inagaki
The High Field Laboratory for Superconducting Materials (HFLSM) is developing a 33 T Cryogen-free Superconducting Magnet (CSM). The major part of the magnetic field will be achieved thanks to a High Temperature Superconductor (HTS) insulated insert based on the Robust Coil concept. This design features, for each turn, two tapes wound together, in direct contact to enhance the coil's protection. However, a drawback of this architecture is the development of coupling currents caused by variations in the axial component of the magnetic field. These currents lead to additional losses and affect the quality of the magnetic field. This work focuses specifically on the impact of these coupling currents on the magnetic field quality at the location of the future samples in the context of developing a user magnet. The case study of this work is a large-scale prototype of the future HTS insert. To achieve this objective, numerical simulations were conducted to differentiate what are the qualitative effects of coupling currents and screening currents. The results showed that these currents have opposite effects on the magnetic field at the sample position. Additionally, the large-scale prototype experienced long current plateaus, during which the magnetic field was measured. The variations of the latter were driven by the relaxation of these opposing effects, each exhibiting different rates and relaxation times.
{"title":"Effects on the Magnetic Field Stability of Coupling Currents Existing in a Two-Tape Bundle of a HTS Insert Prototype","authors":"A. Zampa;Y. Tsuchiya;K. Takahashi;T. Okada;S. Awaji;T. Uto;H. Takewa;S. Hanai;S. Ioka;J. Inagaki","doi":"10.1109/TASC.2024.3514994","DOIUrl":"https://doi.org/10.1109/TASC.2024.3514994","url":null,"abstract":"The High Field Laboratory for Superconducting Materials (HFLSM) is developing a 33 T Cryogen-free Superconducting Magnet (CSM). The major part of the magnetic field will be achieved thanks to a High Temperature Superconductor (HTS) insulated insert based on the Robust Coil concept. This design features, for each turn, two tapes wound together, in direct contact to enhance the coil's protection. However, a drawback of this architecture is the development of coupling currents caused by variations in the axial component of the magnetic field. These currents lead to additional losses and affect the quality of the magnetic field. This work focuses specifically on the impact of these coupling currents on the magnetic field quality at the location of the future samples in the context of developing a user magnet. The case study of this work is a large-scale prototype of the future HTS insert. To achieve this objective, numerical simulations were conducted to differentiate what are the qualitative effects of coupling currents and screening currents. The results showed that these currents have opposite effects on the magnetic field at the sample position. Additionally, the large-scale prototype experienced long current plateaus, during which the magnetic field was measured. The variations of the latter were driven by the relaxation of these opposing effects, each exhibiting different rates and relaxation times.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-6"},"PeriodicalIF":1.7,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142875081","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
Effect of Magnetic Field Angle, Cabling Deformation and Transverse Loading on ITER Nb3Sn Strand Hysteresis Loss
IF 1.7 3区 物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-12-11 DOI: 10.1109/TASC.2024.3515968
Arend Nijhuis;Melle de Haan;Ruben Lubkemann;Pierre Bauer
For the ITER superconducting magnets, evaluation of their AC losses with computer models is essential for the preparation of the ITER magnet system commissioning and operation. A benchmarking effort on the recently tested CS Module 2 and 6 cold test AC loss data, revealed a significant discrepancy between model and experiment. For better understanding, the magnetization is measured on virgin strands and compared with AC loss of full-size CS CICCs in virgin condition and after being subjected to transverse load cycling. Eleven different ITER Nb3Sn strand types are tested in a Vibrating Sample Magnetometer (VSM) for different angles between strand axis and magnetic field orientation. In addition, few longer strand samples with different winding density were tested in the Twente magnetometer for comparison to short VSM sample results. The comparisons serve to evaluate the potential impact of cabling, transverse load strand damage, demagnetization and field angle. It was found that these effects were not large enough to explain the discrepancy between short sample measurements and model at one side and CS module loss at the other side.
{"title":"Effect of Magnetic Field Angle, Cabling Deformation and Transverse Loading on ITER Nb3Sn Strand Hysteresis Loss","authors":"Arend Nijhuis;Melle de Haan;Ruben Lubkemann;Pierre Bauer","doi":"10.1109/TASC.2024.3515968","DOIUrl":"https://doi.org/10.1109/TASC.2024.3515968","url":null,"abstract":"For the ITER superconducting magnets, evaluation of their AC losses with computer models is essential for the preparation of the ITER magnet system commissioning and operation. A benchmarking effort on the recently tested CS Module 2 and 6 cold test AC loss data, revealed a significant discrepancy between model and experiment. For better understanding, the magnetization is measured on virgin strands and compared with AC loss of full-size CS CICCs in virgin condition and after being subjected to transverse load cycling. Eleven different ITER Nb\u0000<sub>3</sub>\u0000Sn strand types are tested in a Vibrating Sample Magnetometer (VSM) for different angles between strand axis and magnetic field orientation. In addition, few longer strand samples with different winding density were tested in the Twente magnetometer for comparison to short VSM sample results. The comparisons serve to evaluate the potential impact of cabling, transverse load strand damage, demagnetization and field angle. It was found that these effects were not large enough to explain the discrepancy between short sample measurements and model at one side and CS module loss at the other side.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142905692","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
Re-Assembly and Test of a COMB Dipole Magnet With STAR Wires
IF 1.7 3区 物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-12-11 DOI: 10.1109/TASC.2024.3514598
Vadim V. Kashikhin;S. Cohan;J. DiMarco;O. Kiemschies;S. Krave;V. Lombardo;V. Marinozzi;D. Orris;S. Stoynev;D. Turrioni;A. K. Chavda;U. Sambangi;S. Korupolu;J. Peram;A. Arjun;C. Goel;J. Sai Sandra;V. Yerraguravagari;R. Schmidt;V. Selvamanickam;G. Majkic;E. Galstyan;N. Mai;K. Selvamanickam
Rare-Earth Barium Copper Oxide (REBCO) coated conductors are an attractive option for application in high field accelerator magnets due to their high critical field and the convenience of fabrication without heat treatment compared to some other superconductors. A small REBCO accelerator magnet was previously fabricated and tested in liquid nitrogen, demonstrating over 90% critical current retention in the coils. This paper describes the magnet re-assembly with a different support structure and its test in liquid helium at 1.8–4.5 K. The magnet quench history along with the instrumentation data is presented and discussed.
{"title":"Re-Assembly and Test of a COMB Dipole Magnet With STAR Wires","authors":"Vadim V. Kashikhin;S. Cohan;J. DiMarco;O. Kiemschies;S. Krave;V. Lombardo;V. Marinozzi;D. Orris;S. Stoynev;D. Turrioni;A. K. Chavda;U. Sambangi;S. Korupolu;J. Peram;A. Arjun;C. Goel;J. Sai Sandra;V. Yerraguravagari;R. Schmidt;V. Selvamanickam;G. Majkic;E. Galstyan;N. Mai;K. Selvamanickam","doi":"10.1109/TASC.2024.3514598","DOIUrl":"https://doi.org/10.1109/TASC.2024.3514598","url":null,"abstract":"Rare-Earth Barium Copper Oxide (REBCO) coated conductors are an attractive option for application in high field accelerator magnets due to their high critical field and the convenience of fabrication without heat treatment compared to some other superconductors. A small REBCO accelerator magnet was previously fabricated and tested in liquid nitrogen, demonstrating over 90% critical current retention in the coils. This paper describes the magnet re-assembly with a different support structure and its test in liquid helium at 1.8–4.5 K. The magnet quench history along with the instrumentation data is presented and discussed.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-7"},"PeriodicalIF":1.7,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142890321","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
IEEE Transactions on Applied Superconductivity Publication Information
IF 1.7 3区 物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-12-11 DOI: 10.1109/TASC.2024.3508414
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IEEE Transactions on Applied Superconductivity
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