Influence of substrate magnetism of coated conductors on critical current distribution measurement using magnetic knife method

Jiang, Zhenan; Amemiya, Naoyuki; Onuma, Taiki; Kato, Takeshi; Ueyama, M.; Kashima, N.; Nagàya, Shigeo; Shiohara, Yuh

doi:10.1016/j.physc.2008.05.241

Cited by 4 publications

(4 citation statements)

References 12 publications

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“…[7][8][9][10] It was claimed, however, that they have little effect on the critical current in self field. 11 The results presented here suggest that, with and without applied field, the magnetic history of the substrate may have a strong influence on I cr , although, for both CCs, we can ascribe its reduction to the repulsive forces existing between in-plane vortices.…”

Section: Introductionmentioning

confidence: 61%

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Critical current reduction in coated conductors when in-plane fields are applied

Lécrevisse

Rey

Thimont

et al. 2012

Journal of Applied Physics

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International audienceWe report measurements of the critical current of two commercial coated conductors at low temperatures when in-plane magnetic fields up to 15 T are applied. The comparison between the two samples suggests that the presence of a magnetic substrate may have a detrimental effect, at least at low and medium fields. Nevertheless, the critical current density at 30 K and 15 T is in the range of that measured in self field at 77 K. We ascribe its reduction in presence of the field to inter-vortex forces

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Section: Introductionmentioning

confidence: 61%

“…The maxima of I cr w at 20 K and 30 K for the AMSC344C are obtained for B 6 ¼ 0. In contrast to the claim that magnetic substrates have no effect on I cr in self field, 11 this behavior can probably be ascribed to the magnetization of the Ni-W substrate and the associated effects in the superconducting film (see Sec. IV).…”

Section: Resultsmentioning

confidence: 81%

Critical current reduction in coated conductors when in-plane fields are applied

Lécrevisse

Rey

Thimont

et al. 2012

Journal of Applied Physics

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“…Contrary to the magnetic knife method [21][22][23][24], limited to the critical current distribution only, this method allows the reconstruction of the static or varying current distribution in every level of the current, within the critical values +I c , −I c , including frozen or remnant currents.…”

Section: The Methods Of Magneto-optic Imagingmentioning

confidence: 99%

Errors in measurement of current distribution in a superconducting tape

Usak¹

2011

Supercond. Sci. Technol.

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The paper reports on the role of the typical mapping errors in measurement of the lateral sheet current distribution Iy(x) in a superconducting tape. The sheet current is calculated indirectly, from the mapped data of the self magnetic field of the superconducting layer. The field is generated by transport or induced current in a tape. In model calculations examples of the influence of the different types of errors on false shaping of the lateral sheet current profile are given. The field mapping is made outside and over the tape. The lateral profile Bz(x, z) of the magnetic field component, perpendicular to the superconducting layer, is input to the Biot–Savart inverse procedure. In the experiment we have used superconducting tape as a sample and an InSb Hall probe with active surface 20 × 20 µm2 as a magnetic field sensor. We demonstrate the details, together with obstacles and errors encountered in measurement and subsequent evaluation. The demonstrations serve for the reader to be aware of limits in interpretation of the measured data and to overcome the natural barrier in understanding, insight and use of this fruitful method.

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“…The lateral J c distributions are not always uniform in coated conductors: the J c often degrades near the edges of coated conductors due to the deposition or slitting process during their fabrication [19][20][21][22][23][24]. Because the ac loss characteristics are determined by the mode of the magnetic flux penetration from the edges of coated conductors, the J c near the edges of coated conductors particularly impacts them [15,20,[23][24][25].…”

Section: Lateral Critical Current Density Distributions Of Coated Con...mentioning

confidence: 99%

Ac loss reduction of multilayer superconducting power transmission cables by using narrow coated conductors

Amemiya

Ito

et al. 2011

Supercond. Sci. Technol.

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The ac loss characteristics of coated conductors are dominated by the magnetic field component normal to their superconductor layer. Multilayer cables as well as monolayer cables consisting of 4 mm-wide coated conductors (named 4 mm cables) and those consisting of 2 mm-wide coated conductors (named 2 mm cables) were designed, and numerical electromagnetic field analyses were performed in their cross sections to calculate their ac losses. Trapezoidal lateral critical current density Jc distributions with shoulders as well as uniform ones were assumed in coated conductors for the analyses. The former models the degraded Jc near the edges of coated conductors. In the case of the monolayer, the calculated ac losses of the 2 mm cables were comparable to those of the 4 mm cables. In the cases of the multilayers, the calculated ac losses of the 2 mm cables were obviously less than those of the 4 mm cables. The degraded Jc near the edges of coated conductors more seriously affects the ac loss characteristics of the 2 mm cables than those of the 4 mm cables. However, even if we consider the influence of the degraded Jc near the edges of coated conductors, 2 mm-wide coated conductors are more profitable than 4 mm-wide coated conductors in multilayer cables from the viewpoint of ac loss reduction.

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Influence of substrate magnetism of coated conductors on critical current distribution measurement using magnetic knife method

Cited by 4 publications

References 12 publications

Critical current reduction in coated conductors when in-plane fields are applied

Critical current reduction in coated conductors when in-plane fields are applied

Errors in measurement of current distribution in a superconducting tape

Ac loss reduction of multilayer superconducting power transmission cables by using narrow coated conductors

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