引用本文: |
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张晴,张义邴,周迪帆,蔡传兵.高温超导块材磁通汇聚效应的数值模拟研究[J].低温物理学报,2020,(3):145-151. [点击复制]
- ZHANG Qing,ZHANG Ybing,ZHOU Difan,CAI Chuanbing.Numerical Simulationon Magnetic Flux Concentration Using Bulk High Temperature Superconductors[J].LOW TEMPERATURE PHYSICAL LETTERS,2020,(3):145-151. [点击复制]
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摘要: |
高温超导块材在零场冷条件下感应产生的涡流可以有效地屏蔽外加磁场, 从而改变空间磁场分布. 通过合理的设计, 该效应可以被用来约束、 聚集磁通, 从而增大局域磁通密度, 对于需要高磁通密度和磁场梯度的应用具有重要意义. 本论文利用基于 H 方程的二维有限元数值模拟, 结合 GdBa2Cu3 O7 -δ 材料实测的Jc (B ,T ) 关系,研究了 GdBa2Cu3 O7 -δ 超导块材的磁通汇聚效果, 分析了超导块材的空间位置、 工作温度及不同外加磁场对其磁通密度放大效果的影响. 结果显示在30 K 的温度下, 外加11 T 的外加磁场时, 可以在间距为2 mm 的两块超导块体间隙获得17.2 T 的磁场, 磁场放大效率达到56 % . |
关键词: 高温超导块材, 有限元方法, 磁屏蔽效应, 磁通汇聚 |
DOI:10.13380/j .ltpl.2020.03.005 |
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基金项目: |
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Numerical Simulationon Magnetic Flux Concentration Using Bulk High Temperature Superconductors |
ZHANG Qing, ZHANG Ybing, ZHOU Difan, CAI Chuanbing
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(Key Laboratory of High Temperature Superconductivity , Department of Physics , School of Science , Shanghai University , Shanghai 200444) |
Abstract: |
Bulk high temperature supercongductors can effectively shield the external magnetic field, and hence change the distribution of the magnetic field. This effect can be used to confine and concentrate magnetic flux via reasonable design, thereby increasing the local magnetic flux density, which is meaningful for a variety of applications where high magnetic flux density and magnetic field gradients are required. In this paper, we numerically simulated the concentration effect of magnetic flux exploiting the shielding effect of GdBa2Cu3 O7 -δ bulk superconductors. A two-dimensional finite element model based on the H-formulation and the measured Jc (B , T ) relationship of the GdBa2Cu3 O7 -δ material was built to investigate the effect of the spatial position of bulk superconductors, working temperature, and the magnitude of applied field on the enhancement of flux density at the designed working zone. The results show that, at 30 K, a magneticfield of 17.2 T can be obtained in between two bulk superconductors with a distance of 2 mm when a field of 11 T was applied. The magnetic field amplification efficiency reaches significantly 56% . |
Key words: HTS bulk, Finite Element Method, Magnetic shielding effect, Magnetic flux concentration |