Field-dependent critical state of high-Tc superconducting strip simultaneously exposed to transport current and perpendicular magnetic field

Xue, Cun; He, Aihua; Yong, Huadong; Zhou, Youhe

doi:10.1063/1.4849396

Cited by 9 publications

(3 citation statements)

References 32 publications

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“…McDonald and Clem [24] derived the exact solutions for the flux penetration into a infinitely long superconducting film with such field-dependent critical current. Xue et al [25] extended it to the case where both a transport current and a magnetic field are applied to a superconducting film. In the case considered here, with such a field-dependence, the distribution of sheet current across the film typically has the shape illustrated in Fig.…”

Section: Modelmentioning

confidence: 99%

Selective triggering of magnetic flux avalanches by an edge indentation

et al. 2020

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We numerically investigate the effect of an edge indentation on the threshold field of thermomagnetic instabilities in superconducting films subjected to a ramping magnetic field, applied perpendicular to the plane of the film. In particuar, we are able to address the question on whether edge indentations promote magnetic flux avalanches. For magnetic field-independent critical current densities model, the triggering of the first magnetic flux avalanche systematically occurs at the edge indentation. In contrast to that, for the more realistic field-dependent critical current density model the first flux avalanche can take place either at or away from the indentation. This selective triggering of magnetic flux avalanches is shown to result from the variation of the threshold magnetic field for the first flux avalanche triggered at the indentation and the reduction of the critical current density by large local magnetic fields at the tip of the indentation which translates in a lower power density dissipated near the tip. We demonstrate that this interplay can be tuned by varying the indentation size, ramp rate of applied fieldḢa, and working temperature T0. We build up a phase diagram in the µ0Ḣa − T0 plane with well-defined boundaries separating three distinct regimes of thermomagnetic instability.

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Section: Modelmentioning

confidence: 99%

Selective triggering of magnetic flux avalanches by an edge indentation

et al. 2020

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“…In this review, the results of calculations in the Kim model [11] are presented also, but the sample was taken in the form of a disk. In cases where the current depends on the magnetic field, the distributions of induced currents were calculated for special (circular or linear) geometry only, in which current paths a priori were assumed to be either straight lines or circles [10,[12][13][14].…”

Section: Formulation Of the Problem And Basic Equationsmentioning

confidence: 99%

A new method of reconstructing current paths in HTS tapes with defects

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2017

Supercond. Sci. Technol.

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We propose a new method for calculating current paths in high-temperature superconductive (HTS) tapes with various defects including cracks, non-superconducting inclusions, and superconducting inclusions with lower local critical current density. The calculation method is based on a model of critical state which takes into account the dependence of the critical current on the magnetic field. The method allows us to calculate the spatial distribution of currents flowing through the defective HTS tape for both currents induced by the external magnetic field and transport currents from an external source. For both cases, we performed simulations of the current distributions in these tapes with different types of defects and have shown that the combination of the action of the magnetic field and transport current leads to a more detailed identification of the boundaries and shape of the defects. The proposed method is adapted for calculating modern superconductors in real superconducting devices and may be more useful as compared to the conventional magnetometric diagnostic studies, when the tape is affected by the magnetic field only.

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“…[1] In our previous studies, we measured distributions of DC transport current in coated conductor with various external magnetic fields [2] and noticed that the DC current distribution was redistributed by external fields [3][4][5][6][7]. Likewise the DC current experiment, investigation about distribution of AC transport current and field dependence of AC current had been necessary.…”

Section: Introductionmentioning

confidence: 99%

Selective detection of AC transport current distributions in GdBCO coated conductors using low temperature scanning Hall probe microscopy

Kim¹,

Kim²,

Park³

et al. 2017

Progress in Superconductivity and Cryogenics

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We studied the distribution of the current density and its magnetic-field dependence in GdBCO coated conductors with AC bias currents using low temperature scanning Hall probe microscopy. We selectively measured magnetic field profiles from AC signal obtained by Lock-in technique and calculated current distributions by inversion calculation. In order to confirm the AC measurement results, we applied DC current corresponding to RMS value of AC current and compared distribution of AC and DC transport current. We carried out the same measurements at various external DC magnetic fields, and investigated field dependence of AC current distribution. We notice that the AC current distribution unaffected by external magnetic fields and preserved their own path on the contrary to DC current.

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Field-dependent critical state of high-Tc superconducting strip simultaneously exposed to transport current and perpendicular magnetic field

Cited by 9 publications

References 32 publications

Selective triggering of magnetic flux avalanches by an edge indentation

Selective triggering of magnetic flux avalanches by an edge indentation

A new method of reconstructing current paths in HTS tapes with defects

Selective detection of AC transport current distributions in GdBCO coated conductors using low temperature scanning Hall probe microscopy

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