IEEE Transactions on Applied Superconductivity最新文献_第4页

Preliminary Design of a Block-Coil Magnet for the Muon Collider Ring

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2024-12-02 DOI: 10.1109/TASC.2024.3510234

Luca Alfonso;Andrea Bersani;Luca Bottura;Barbara Caiffi;Stefania Farinon;Andrea Gagno;Filippo Levi;Francesco Mariani;Samuele Mariotto;Riccardo Musenich;Daniel Novelli;Alessandra Pampaloni;Tiina Salmi

{"title":"Preliminary Design of a Block-Coil Magnet for the Muon Collider Ring","authors":"Luca Alfonso;Andrea Bersani;Luca Bottura;Barbara Caiffi;Stefania Farinon;Andrea Gagno;Filippo Levi;Francesco Mariani;Samuele Mariotto;Riccardo Musenich;Daniel Novelli;Alessandra Pampaloni;Tiina Salmi","doi":"10.1109/TASC.2024.3510234","DOIUrl":"https://doi.org/10.1109/TASC.2024.3510234","url":null,"abstract":"In the framework of the IMCC (International Muon Collider Collaboration), a feasibility study for a collider ring 10 km long with muons having a center of mass energy of 10 TeV is currently being carried out. The superconducting magnets represent one of the most challenging components of the collider stage of such a facility: indeed, the need for high fields, large apertures and dipole + quadrupole combined function require technological choices at the edge of the status of the art. These requirements arise from the short lifetime at rest of the muons, 2.2 \u0000<inline-formula><tex-math>$mu text {s}$</tex-math></inline-formula>\u0000, which brings the need for a compact collider to maximize the luminosity and large bore magnets to accommodate adequate shielding for the decay products. Furthermore, long straight sections must be avoided to mitigate the dose hazard induced by the collimated neutrino beams produced by the muon decay, hence dipoles and quadrupoles must be combined in the same magnets. In this contribution we will present the preliminary 2D design of a superconducting magnet based on the block-coil concept that meets the requirements needed for the muon collider ring, focusing both on the electromagnetic and mechanical aspects.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825892","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

Study on the Process of Monolith NbTi Wire With High N-Value and High Dimensional Accuracy for NMR

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2024-12-02 DOI: 10.1109/TASC.2024.3509819

Zhang Kailin;Guo Qiang;Jiang Longtao;Han Luyang;Zhao Jiajun;Li Hengchao;Zhu Yanmin;Yan Lingxiao;Wang Ruilong;Zhou Zijing;Liu Xianghong;Feng Yong;Li Jianfeng;Zhang Pingxiang

{"title":"Study on the Process of Monolith NbTi Wire With High N-Value and High Dimensional Accuracy for NMR","authors":"Zhang Kailin;Guo Qiang;Jiang Longtao;Han Luyang;Zhao Jiajun;Li Hengchao;Zhu Yanmin;Yan Lingxiao;Wang Ruilong;Zhou Zijing;Liu Xianghong;Feng Yong;Li Jianfeng;Zhang Pingxiang","doi":"10.1109/TASC.2024.3509819","DOIUrl":"https://doi.org/10.1109/TASC.2024.3509819","url":null,"abstract":"NMR equipment mainly studies substances' molecular structure and physical properties. It also puts higher requirements on the magnetic field homogeneity of the equipment, which is required to reach the PPB level. Therefore, stricter requirements for processing control have also been put forward for superconducting wires. Generally, the n-value of the wires used in NMR must be over 50 at 5 T, while conventional monolith wire can only achieve 35∼45 at 5 T. In this paper, we discussed the relationship between the deformation of the filaments and the n-value. By optimizing the raw material and extrusion ratio of superconducting ingot, the deformation of the filaments is more uniform, and the n-value is increased to about 60. For conventional monolith wire, the dimensional accuracy can only achieve ± 5 µm, which cannot meet the requirement of ± 3 µm for NMR. We adopted the process of overdrawing after enameling. By changing the type of insulating material and adjusting the processing technology of overdrawing, the dimensional tolerances of the insulated wire can achieve ± 2 µm. The superconducting wire mentioned in this article can not only meet the requirement of NMR but also have application opportunities in MRI and other fields.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142844424","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

System Modeling and Control Strategy of a Superconducting Powertrain for Electric Aircraft 电动飞机超导动力系统的系统建模与控制策略

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2024-11-29 DOI: 10.1109/TASC.2024.3509387

Ali Khonya;Mathias Noe;Frederick Berg;Lars Kühn;Reda Abdouh;Wescley T. B. de Sousa;Alexandre Colle;Michael Cooper

{"title":"System Modeling and Control Strategy of a Superconducting Powertrain for Electric Aircraft","authors":"Ali Khonya;Mathias Noe;Frederick Berg;Lars Kühn;Reda Abdouh;Wescley T. B. de Sousa;Alexandre Colle;Michael Cooper","doi":"10.1109/TASC.2024.3509387","DOIUrl":"https://doi.org/10.1109/TASC.2024.3509387","url":null,"abstract":"Aviation contributes approximately 2.4% to the annual global \u0000<inline-formula><tex-math>$text{CO}_{2}$</tex-math></inline-formula>\u0000 emissions. This serves as a driving force behind the development of a fully electric, zero-emission aircraft. One possibility is using liquid hydrogen at a temperature of 20 K that fits very well with lightweight and efficient superconducting components within an electric aircraft to produce energy through a fuel cell, as it has the highest energy content per weight among all energy carriers. A potential powertrain of a large electric aircraft comprises various components, including the motor, DC/AC inverter, DC and AC cables, fuel cell, and fault current limiter. Building on previous work that modeled superconducting fault current limiters and cables using MATLAB/SIMULINK, this study focuses on the motor, DC/AC inverter, and fuel cell. For the fuel cell, even though most publications propose only the resistive-capacitive (R-C) electrical equivalent circuit, in some cases, a resistive-inductive (R-L) behavior or sometimes a combination of both is detected. Therefore, a novel model that covers all scenarios is proposed for this work. Furthermore, the electrical model and control scheme of the permanent magnet synchronous motor (PMSM) via a DC/AC inverter are detailed. Additionally, an algorithm is developed to protect the inverter during short circuits. The simulation flight scenarios are employed with input speed as a key parameter to simulate the complete integrated system. Moreover, a DC pole-to-pole short circuit is analyzed to simulate the system's behavior in fault conditions. The simulation shows the entire system's behavior during nominal test flight scenarios and short circuit events. Moreover, these models give the user flexibility to adjust the powertrain properties.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825978","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

Electromechanical Coupling Dynamics Modeling and Analysis of Superconducting Electrodynamic Suspension Train Under Random Irregularities

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2024-11-29 DOI: 10.1109/TASC.2024.3509392

Huan Huang;Hanlin Zhu;Haitao Li;Li Wang;Yan Xu;Guobin Lin

{"title":"Electromechanical Coupling Dynamics Modeling and Analysis of Superconducting Electrodynamic Suspension Train Under Random Irregularities","authors":"Huan Huang;Hanlin Zhu;Haitao Li;Li Wang;Yan Xu;Guobin Lin","doi":"10.1109/TASC.2024.3509392","DOIUrl":"https://doi.org/10.1109/TASC.2024.3509392","url":null,"abstract":"Superconducting electrodynamic suspension (EDS) systems show great promise for high-speed transportation. However, they are subjected to random vibrations due to spatial magnetic field higher harmonics and geometric irregularities from the ground levitation and guidance coils (LGCs), which affect the magnetic-thermal stability of superconducting coils (SCs) and overall vehicle operation. Therefore, the vibration characteristics of the EDS system is crucial for vehicle design. This article presents a comprehensive electromechanical coupling co-simulation of a three-car, four-bogie train, integrating a dynamic circuit equation with a dynamics equation. Random excitations from lateral and vertical irregularities serve as inputs for the dynamic magnetic-track relations. The dynamic responses are simulated at medium-low speed, high speed, and ultra-high speed (200, 400, and 600 km/h). The analysis focuses on both the time domain and frequency domain vibration characteristics of the bogie and car body. Additionally, the stability of the vehicle body is evaluated using acceleration and the Sperling stability index. Results indicate that the maximum lateral and vertical accelerations remain within acceptable limits, demonstrating that the EDS train maintains good riding comfort even at high speeds. The model developed in this article could be extended to analyze additional scenarios, such as irregularities in the electrical parameters of track coils or curved track transitions.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142875112","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

Exceptionally High Values in Alloyed Bulk Samples of NbSn

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2024-11-29 DOI: 10.1109/TASC.2024.3509388

Manish Mandal;Chiara Tarantini;William L. Starch;Peter J. Lee;David C. Larbalestier

{"title":"Exceptionally High Values in Alloyed Bulk Samples of NbSn","authors":"Manish Mandal;Chiara Tarantini;William L. Starch;Peter J. Lee;David C. Larbalestier","doi":"10.1109/TASC.2024.3509388","DOIUrl":"https://doi.org/10.1109/TASC.2024.3509388","url":null,"abstract":"Nb\u00003\u0000Sn is the original high-field superconductor, but understanding its optimization in wire forms, which are always inhomogeneous, is compromised by a lack of basic understanding of its true property variations when it is alloyed with \u0000<italic>Hc2\u0000 enhancing additions (e.g., Hf, Ta, Ti, and Zr). Since improving the high-field performance of Nb\u00003\u0000Sn is important for many future applications in high-energy physics, fusion, and medicine, we study bulk binary and alloyed samples fabricated by ball milling their constituent powders and reacting them in a hot isostatic press at pressures up to 2000bar and temperatures up to 1800 °C. Remarkably, we found that these bulk samples, reacted to produce the A15 phase at temperatures between 1200 and 1800°C, show minority traces of \u0000<italic>Hc2\u0000 (0 K), evaluated with a 99% criterion, that reach almost 40T, more than 27% higher than the best value previously reported for Nb\u00003\u0000Sn. These results are both scientifically interesting but potentially of great practical importance if they can be exploited for improving the high-field properties of Nb\u00003\u0000Sn wires. One caution is that these samples do not have added Cu as wires do and that the high \u0000<italic>Hc2\u0000 reactions were all done at well above 1000°C.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-6"},"PeriodicalIF":1.7,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825777","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

3D Modeling and Simulation of HTS Stacked Tapes Magnetic Lens Within Small HTS Coil

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2024-11-29 DOI: 10.1109/TASC.2024.3509397

Ruixiang Wang;Changhao Hu;Lei Wang;Jianzhao Geng

{"title":"3D Modeling and Simulation of HTS Stacked Tapes Magnetic Lens Within Small HTS Coil","authors":"Ruixiang Wang;Changhao Hu;Lei Wang;Jianzhao Geng","doi":"10.1109/TASC.2024.3509397","DOIUrl":"https://doi.org/10.1109/TASC.2024.3509397","url":null,"abstract":"Magnetic lens, with its specific superconducting material structure, spatially concentrates magnetic flux, making it highly significant for the development of compact high-field systems. High-\u0000<italic>T\u0000c\u0000 superconducting bulk superconductors commonly used in magnetic lenses can trap high magnetic fields at low temperatures. However, a large Lorentz force developed during the magnetization process results in the formation and propagation of crack within bulk, eventually leading to mechanical failure. High-temperature superconducting tapes (HTS tapes) with excellent mechanical and flux pinning properties, have become the ideal material for magnetic lens. In this study, we designed and simulated magnetic lens using HTS stacked tapes with different shapes within a small coil to analyze the central magnetic flux density. This reflects the magnetic flux concentration in the central region. The results show that the stacked tapes with the specified dimensions can increase an external magnetic field of 16.80 T to 17.46 T. The finite element simulation model provides valuable references for the shape and size of the magnetic lens in compact small-scale magnets throughout the optimization design process.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825774","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

Optimization of Suspension Damping in High-Temperature Superconducting Maglev Based on Combined Skyhook-Groundhook Control 基于天钩-地钩组合控制的高温超导磁悬浮悬浮阻尼优化

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2024-11-29 DOI: 10.1109/TASC.2024.3509383

Haitao Li;Yan Li;Shuonan Zhang;Penghui Zhang;Zigang Deng;Li Wang;Yougang Sun

{"title":"Optimization of Suspension Damping in High-Temperature Superconducting Maglev Based on Combined Skyhook-Groundhook Control","authors":"Haitao Li;Yan Li;Shuonan Zhang;Penghui Zhang;Zigang Deng;Li Wang;Yougang Sun","doi":"10.1109/TASC.2024.3509383","DOIUrl":"https://doi.org/10.1109/TASC.2024.3509383","url":null,"abstract":"High-temperature superconducting (HTS) maglev technology offers significant potential for high-speed transportation due to its zero magnetic resistance. However, the inherent low damping characteristics of HTS maglev systems make them highly vulnerable to external disturbances, leading to reduced system stability, passenger discomfort, and thermal instability of superconducting magnets. Therefore, it is essential to simultaneously address vibrations in both the vehicle body and the suspension frame. To address this challenge, an electromagnetic damper is introduced between the vehicle body and the suspension frame, along with a skyhook-groundhook control strategy to collaboratively regulate vibrations of both components. The parameters of control algorithm are optimized using the entropy weight method, focusing on multiple dynamic performance indicators. Simulation results indicate that the proposed approach significantly reduces vibrations in the suspension frame and vehicle body simultaneously compared to traditional skyhook-only or groundhook-only control strategies. Consequently, the stability and ride quality of HTS maglev systems are enhanced, making them more suitable for high-speed transportation applications.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825928","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

Analytical and Numerical Study of Superconducting Dipole and Quadrupole Performance Limits for a Muon Collider

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2024-11-28 DOI: 10.1109/TASC.2024.3507744

Daniel Novelli;Luca Alfonso;Andrea Bersani;Luca Bottura;Barbara Caiffi;Stefania Farinon;Filippo Levi;Francesco Mariani;Samuele Mariotto;Alessandra Pampaloni;Tiina Salmi

{"title":"Analytical and Numerical Study of Superconducting Dipole and Quadrupole Performance Limits for a Muon Collider","authors":"Daniel Novelli;Luca Alfonso;Andrea Bersani;Luca Bottura;Barbara Caiffi;Stefania Farinon;Filippo Levi;Francesco Mariani;Samuele Mariotto;Alessandra Pampaloni;Tiina Salmi","doi":"10.1109/TASC.2024.3507744","DOIUrl":"https://doi.org/10.1109/TASC.2024.3507744","url":null,"abstract":"In accordance with the guidelines set forth in the Updated European Strategy for Particle Physics, the International Muon Collider Collaboration has been initiated to assess the feasibility of a Muon Collider facility with a center-of-mass energy of 10 TeV. The primary challenges stem from the brief muon lifetime at rest, which is limited to 2.2 µs. Addressing this demanding condition necessitates the incorporation of advanced technologies in magnets, RF systems, targets, shielding, and cooling. To minimize collimated neutrino beams resulting from muon decay and reduce the impact of radiation background around the facility, the straight sections in the collider ring must be minimized. Achieving this goal involves integrating beam optics quadrupoles with bending dipoles featuring a high magnetic field (\u0000<inline-formula><tex-math>$>$</tex-math></inline-formula>\u000010 T) and gradient (\u0000<inline-formula><tex-math>$>$</tex-math></inline-formula>\u0000100 T/m) within a large aperture (140 mm). These stringent constraints require cutting-edge technologies in material selection, mechanical layout, quench protection, shielding, and cooling. This contribution explores the performance limits of potential candidate materials for such magnets, specifically LTS (Low-Temperature Superconductors) Nb\u0000<inline-formula><tex-math>$_{3}$</tex-math></inline-formula>\u0000Sn and (High-Temperature Superconductors) ReBCO, regarding the maximum field, mechanical stress, and stored energy. We present an original approach that allows us to explore the achievable phase space of parameters using both analytical expressions and the FEM software ANSYS, handled by Python code. Using this approach, we will show the obtained results for dipoles and quadrupoles.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-5"},"PeriodicalIF":1.7,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825772","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

Performance of a HL-LHC Nb$_text{3}$Sn Quadrupole Magnet in the 100–200 MPa Range of Azimuthal Stress

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2024-11-28 DOI: 10.1109/TASC.2024.3507751

F. J. Mangiarotti;S. Izquierdo Bermudez;A. Devred;R. Diaz Vez;J. Ferradas Troitino;S. Ferradas Troitino;J. Feuvrier;M. Guinchard;A. Haziot;A. Milanese;S. Mugnier;J. C. Perez;P. Quassolo;S. Russenschuck;E. Todesco;G. Willering

{"title":"Performance of a HL-LHC Nb$_text{3}$Sn Quadrupole Magnet in the 100–200 MPa Range of Azimuthal Stress","authors":"F. J. Mangiarotti;S. Izquierdo Bermudez;A. Devred;R. Diaz Vez;J. Ferradas Troitino;S. Ferradas Troitino;J. Feuvrier;M. Guinchard;A. Haziot;A. Milanese;S. Mugnier;J. C. Perez;P. Quassolo;S. Russenschuck;E. Todesco;G. Willering","doi":"10.1109/TASC.2024.3507751","DOIUrl":"https://doi.org/10.1109/TASC.2024.3507751","url":null,"abstract":"With the assembly and test results of four Nb\u0000<inline-formula><tex-math>$_text{3}$</tex-math></inline-formula>\u0000Sn short-model quadrupoles (MQXFS) for the High Luminosity Upgrade of the CERN Large Hadron Collider (LHC), an optimum pre-load level was established for the construction of the full-length, series magnets. Successive MQXFS magnets were used as testbeds for potential changes (including pre-load fine tuning) to be implemented in the series, and to better understand the stress dependence of Nb\u0000<inline-formula><tex-math>$_text{3}$</tex-math></inline-formula>\u0000Sn magnet performance. In this paper we report the findings of the short model MQXFS7, where we investigated the effect of higher azimuthal pre-load on the performance of this magnet assembled with coils wound from Nb\u0000<inline-formula><tex-math>$_text{3}$</tex-math></inline-formula>\u0000Sn Restacked-Rod-Process (RRP) conductors, which are the baseline for MQXF magnets, and Powder-In-Tube (PIT) conductors, which were initially considered as a potential candidate but subsequently set aside. Starting at the baseline level of 110 MPa azimuthal preload at 1.9 K (corresponding to a full preload at nominal current, which is 77% of the short sample limit at 1.9 K), we increased the pre-load in steps of 20 MPa up to 190 MPa. The magnet was able to operate above 90% of the short sample limit indicating a large range of possible preloads. Indications of performance degradation at 90-95% of the short sample limit were found in the PIT conductor at 170 and 190 MPa. The test included a significant set of observables, such as the ramp rate dependency on the quench current, and V-I measurements to see growing resistance in segments of the coil.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-7"},"PeriodicalIF":1.7,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10770825","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142844518","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

Supercritical Helium Flow Calorimetry at the MIT Superconducting Magnet Test Facility

IF 1.7 3区物理与天体物理

IEEE Transactions on Applied Superconductivity Pub Date : 2024-11-28 DOI: 10.1109/TASC.2024.3508664

Philip C. Michael;Theodore Golfinopoulos;Alexey Kaplan;Shane Schweiger;Ivan Garcia;Amy Watterson;Sarah Chamberlain;Daniel Nash;Christopher Craighill;Charlie Sanabria;Eric Laamanen;Colin McCormack

{"title":"Supercritical Helium Flow Calorimetry at the MIT Superconducting Magnet Test Facility","authors":"Philip C. Michael;Theodore Golfinopoulos;Alexey Kaplan;Shane Schweiger;Ivan Garcia;Amy Watterson;Sarah Chamberlain;Daniel Nash;Christopher Craighill;Charlie Sanabria;Eric Laamanen;Colin McCormack","doi":"10.1109/TASC.2024.3508664","DOIUrl":"https://doi.org/10.1109/TASC.2024.3508664","url":null,"abstract":"This paper presents recent upgrades to the supercritical helium circuit at the MIT Superconducting Magnet Test Facility to support the characterization of REBCO-based cable magnets. In particular, we discuss the design, calibration and installation of dedicated mass flow meters for every conductor layer in a multi-layer magnet. The design and manufacture of dedicated calibration heaters for each flow path is also described. When used in concert with inlet and outlet pressure and temperature sensors, these upgrades allow us to characterize the hydraulic response of each conductor layer. When deployed as a helium flow calorimeter, the configuration provides a cross-check of DC power dissipation in layer-to-layer conductor joints, facilitates the determination of AC loss heating during swept current and exponential current dump discharges, and permits a more accurate assessment of the energy dissipation within a magnet during quenching. Representative examples for each type of measurement are shown.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 5","pages":"1-6"},"PeriodicalIF":1.7,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825802","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