Superconductor Science & Technology最新文献_第3页

A flux pumping method applied to the magnetization of YBCO superconducting coils: frequency, amplitude and waveform characteristics. 一种用于YBCO超导线圈磁化的磁通泵送方法:频率、幅值和波形特性。

IF 3.6 1区物理与天体物理

Superconductor Science & Technology Pub Date : 2016-01-01 Epub Date: 2016-02-22 DOI: 10.1088/0953-2048/29/4/04lt01

Lin Fu, Koichi Matsuda, Thibault Lecrevisse, Yukikazu Iwasa, Tim Coombs

引用次数: 25

An Analytical Approach towards Passive Ferromagnetic Shimming Design for a High-Resolution NMR Magnet. 为高分辨率 NMR 磁体设计无源铁磁微调的分析方法

IF 3.6 1区物理与天体物理

Superconductor Science & Technology Pub Date : 2015-07-01 Epub Date: 2015-05-19 DOI: 10.1088/0953-2048/28/7/075006

Frank X Li, John P Voccio, Min Cheol Ahn, Seungyong Hahn, Juan Bascuñán, Yukikazu Iwasa

{"title":"An Analytical Approach towards Passive Ferromagnetic Shimming Design for a High-Resolution NMR Magnet.","authors":"Frank X Li, John P Voccio, Min Cheol Ahn, Seungyong Hahn, Juan Bascuñán, Yukikazu Iwasa","doi":"10.1088/0953-2048/28/7/075006","DOIUrl":"10.1088/0953-2048/28/7/075006","url":null,"abstract":"This paper presents a warm bore ferromagnetic shimming design for a high resolution NMR magnet based on spherical harmonic coefficient reduction techniques. The passive ferromagnetic shimming along with the active shimming is a critically important step to improve magnetic field homogeneity for an NMR Magnet. Here, the technique is applied to an NMR magnet already designed and built at the MIT's Francis Bitter Magnet Lab. Based on the actual magnetic field measurement data, a total of twenty-two low order spherical harmonic coefficients is derived. Another set of spherical harmonic coefficients was calculated for iron pieces attached to a 54 mm diameter and 72 mm high tube. To improve the homogeneity of the magnet, a multiple objective linear programming method was applied to minimize unwanted spherical harmonic coefficients. A ferromagnetic shimming set with seventy-four iron pieces was presented. Analytical comparisons are made for the expected magnetic field after Ferromagnetic shimming. The theoretically reconstructed magnetic field plot after ferromagnetic shimming has shown that the magnetic field homogeneity was significantly improved.","PeriodicalId":54440,"journal":{"name":"Superconductor Science & Technology","volume":"28 7","pages":""},"PeriodicalIF":3.6,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4621159/pdf/nihms695242.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"34301147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Magnetic field dependent stability and quench behavior and degradation limits in conduction-cooled MgB₂ wires and coils. 传导冷却MgB2导线和线圈的磁场依赖稳定性、淬火行为和退化限制。

IF 3.6 1区物理与天体物理

Superconductor Science & Technology Pub Date : 2015-03-01 DOI: 10.1088/0953-2048/28/3/035015

Liyang Ye, Davide Cruciani, Minfeng Xu, Susumu Mine, Kathleen Amm, Justin Schwartz

{"title":"Magnetic field dependent stability and quench behavior and degradation limits in conduction-cooled MgB2 wires and coils.","authors":"Liyang Ye, Davide Cruciani, Minfeng Xu, Susumu Mine, Kathleen Amm, Justin Schwartz","doi":"10.1088/0953-2048/28/3/035015","DOIUrl":"https://doi.org/10.1088/0953-2048/28/3/035015","url":null,"abstract":"Long lengths of metal/MgB2 composite conductors with high critical current density (Jc), fabricated by the power-in-tube (PIT) process, have recently become commercially available. Owing to its electromagnetic performance in the 20 K - 30 K range and relatively low cost, MgB2 may be attractive for a variety of applications. One of the key issues for magnet design is stability and quench protection, so the behavior of MgB2 wires and magnets must be understood before large systems can emerge. In this work, the stability and quench behavior of several conduction-cooled MgB2 wires are studied. Measurements of the minimum quench energy and normal zone propagation velocity are performed on short samples in a background magnetic field up to 3 T and on coils in self-field and the results are explained in terms of variations in the conductor architecture, electrical transport behavior, operating conditions (transport current and background magnetic field) and experimental setup (short sample vs small coil). Furthermore, one coil is quenched repeatedly with increasing hot-spot temperature until Jc is decreased. It is found that degradation during quenching correlates directly with temperature and not with peak voltage; a safe operating temperature limit of 260 K at the surface is identified.","PeriodicalId":54440,"journal":{"name":"Superconductor Science & Technology","volume":"28 3","pages":""},"PeriodicalIF":3.6,"publicationDate":"2015-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1088/0953-2048/28/3/035015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"33224891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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: 20

Progresses and challenges in the development of high-field solenoidal magnets based on RE123 coated conductors. 基于RE123涂层导体的高场电磁磁体的研究进展与挑战。

IF 3.6 1区物理与天体物理

Superconductor Science & Technology Pub Date : 2014-01-01 Epub Date: 2014-09-19 DOI: 10.1088/0953-2048/27/10/103001

Carmine Senatore, Matteo Alessandrini, Andrea Lucarelli, Riccardo Tediosi, Davide Uglietti, Yukikazu Iwasa

引用次数: 222

Turn-to-turn contact characteristics for an equivalent circuit model of no-insulation ReBCO pancake coil. 无绝缘 ReBCO 薄饼线圈等效电路模型的匝间接触特性。

IF 3.7 1区物理与天体物理

Superconductor Science & Technology Pub Date : 2013-01-01 Epub Date: 2013-01-28 DOI: 10.1088/0953-2048/26/3/035012

Xudong Wang, Seungyong Hahn, Youngjae Kim, Juan Bascuñán, John Voccio, Haigun Lee, Yukikazu Iwasa

{"title":"Turn-to-turn contact characteristics for an equivalent circuit model of no-insulation ReBCO pancake coil.","authors":"Xudong Wang, Seungyong Hahn, Youngjae Kim, Juan Bascuñán, John Voccio, Haigun Lee, Yukikazu Iwasa","doi":"10.1088/0953-2048/26/3/035012","DOIUrl":"10.1088/0953-2048/26/3/035012","url":null,"abstract":"This paper presents experimental and analytical studies on the characteristic resistance of NI (no-insulation) ReBCO pancake coils, which are used in an equivalent circuit model to characterize 'radial as well as spiral' current paths within the NI coils. We identified turn-to-turn contact resistance as a major source of the characteristic resistance of an NI coil. In order to verify this, three single pancake NI HTS coils-60, 40, 20 turns-were fabricated with their winding tension carefully maintained constant. A sudden discharge test was performed on each coil to obtain its characteristic resistance, and the relation between the turn-to-turn contact and the characteristic resistance was investigated. Based on the characteristic resistance and the n-value model, an equivalent circuit model was proposed to characterize the time-varying response of the NI coils. Charging tests were performed on the three test coils and the experimental results were compared with the simulated ones to validate the proposed approach with the equivalent circuit model.","PeriodicalId":54440,"journal":{"name":"Superconductor Science & Technology","volume":"26 3","pages":""},"PeriodicalIF":3.7,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7453556/pdf/nihms-1038764.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"38325310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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