The effect of the non-uniform critical current density on the magnetoelastic behavior of bulk superconductors: Case of a long cylindrical superconductor

IF 1.3 3区物理与天体物理 Q4 PHYSICS, APPLIED

Physica C-superconductivity and Its Applications Pub Date : 2024-08-08 DOI:10.1016/j.physc.2024.1354580

Yumei Yang , Peng Cheng , Rui Mao , Haijun Lou

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引用次数: 0

Abstract

In this paper, the effect of non-uniform critical current density on bulk superconductors is studied, the case of a long cylindrical superconductor with transport current is chose to discussed. The critical current density is distributed non-uniformly along the radius of the cylinder. Based on the Bean critical state model, the distributions of trapped magnetic flux and shielding current in the cylinder are investigated. Combined with the plane strain approach, the analytical expressions of magnetic flux pinning force and stress are obtained. The magnetostriction of the cylinder is also discussed. Results show that the non-uniform critical current density changes the distribution law of the shielding current and trapped magnetic flux in the cylinder. The increase of non-uniform parameters n leads to an obvious increase in the flux pinning force. Thus, a larger extreme value of the pinning stress is obtained, a bigger structure deformation is produced inside the superconducting cylinder. All those conclusions will provide a helpful guide for engineering application.

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非均匀临界电流密度对块状超导体磁弹性行为的影响：长圆柱形超导体的案例

本文研究了非均匀临界电流密度对体超导体的影响，选择了具有传输电流的长圆柱形超导体的情况进行讨论。临界电流密度沿圆柱半径非均匀分布。基于 Bean 临界状态模型，研究了圆柱体中的捕获磁通和屏蔽电流分布。结合平面应变方法，得到了磁通钉住力和应力的解析表达式。同时还讨论了圆柱体的磁致伸缩。结果表明，非均匀临界电流密度改变了圆柱体中屏蔽电流和捕获磁通的分布规律。非均匀参数的增加会导致磁通钉住力的明显增加。因此，会获得更大的钉应力极值，超导圆筒内部会产生更大的结构变形。所有这些结论都将为工程应用提供有益的指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physica C-superconductivity and Its Applications 物理-物理：应用

CiteScore

2.70

自引率

11.80%

发文量

102

审稿时长

66 days

期刊介绍： Physica C (Superconductivity and its Applications) publishes peer-reviewed papers on novel developments in the field of superconductivity. Topics include discovery of new superconducting materials and elucidation of their mechanisms, physics of vortex matter, enhancement of critical properties of superconductors, identification of novel properties and processing methods that improve their performance and promote new routes to applications of superconductivity. The main goal of the journal is to publish: 1. Papers that substantially increase the understanding of the fundamental aspects and mechanisms of superconductivity and vortex matter through theoretical and experimental methods. 2. Papers that report on novel physical properties and processing of materials that substantially enhance their critical performance. 3. Papers that promote new or improved routes to applications of superconductivity and/or superconducting materials, and proof-of-concept novel proto-type superconducting devices. The editors of the journal will select papers that are well written and based on thorough research that provide truly novel insights.