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Magnetometry Diagnostics of Defects in High-Temperature Superconducting Tapes in a Gradient Magnetic Field

机译:梯度磁场中高温超导带缺陷的磁力学诊断

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摘要

A new technique for contactless magnetometric determination of the local critical current in high-temperature superconducting tapes is proposed. In contrast to conventional approaches, where currents in a superconductor are induced by a uniform magnetic field of an external source, in our variant the tape is magnetized by a series of bipolar permanent magnets. It is shown that, for solving a number of technical problems of defect diagnostics, the proposed approach is more effective than those used earlier. Two variants of diagnostics are discussed. The first variant is intended for express diagnostics of local defects (first of all, transverse cracks) in a separate tape and in a tape stack and the second variant is developed for the case of a smooth critical current variation in a separate tape. The proposed method can significantly improve the accuracy of determining the local critical current density.
机译:提出了一种非接触磁度测定的高温超导磁带中局部临界电流的新技术。 与传统方法相比,通过外部源的均匀磁场引起超导体中的电流,在我们的变型中,带由一系列双极永磁体磁化。 结果表明,为了解决缺陷诊断的许多技术问题,所提出的方法比先前使用的方法更有效。 讨论了两种诊断变体。 第一变型用于在单独的磁带中的局部缺陷(首先,横裂)中的局部缺陷(首先是横裂),并且在单独的磁带中为平稳临界电流变化的情况开发第二变型。 所提出的方法可以显着提高确定局部临界电流密度的准确性。

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  • 来源
    《Technical physics》 |2019年第4期|共10页
  • 作者单位

    Natl Res Nucl Univ MEPhI Moscow Engn Phys Inst Moscow 115409 Russia;

    Natl Res Nucl Univ MEPhI Moscow Engn Phys Inst Moscow 115409 Russia;

    Natl Res Nucl Univ MEPhI Moscow Engn Phys Inst Moscow 115409 Russia;

    Natl Res Nucl Univ MEPhI Moscow Engn Phys Inst Moscow 115409 Russia;

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