Measurement of magnetic properties of Ni-alloy substrate of HTS coated conductor in LN2

Miyagi, Daisuke; Yunoki, Yasushi; Umabuchi, M.; Takahashi, Norio; Tsukamoto, O.

doi:10.1016/j.physc.2008.05.196

Cited by 59 publications

(36 citation statements)

References 6 publications

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“…Therefore we used a modified value of Q s = 200 J m −3 in all the following calculations. The same value was used for a similar tape by Miyagi et al [23]. The results for a parallel magnetic field are presented in figure 9.…”

Section: Ac Loss Of CC Tape On Magnetic Substratementioning

confidence: 97%

AC losses in coated conductors

Gömöry

Vojenčiak

Pardo

et al. 2010

Supercond. Sci. Technol.

122

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Future use of coated conductors in electric power applications like transmission cables, transformers or fault current limiters is sensitive to the amount of dissipation in the AC regime. This paper analyses factors controlling AC loss of coated conductors in typical configurations: the self-field case when transport current generates the magnetic field, and the case of AC applied field where the orientation of magnetic field with respect to the superconducting layer plays a significant role.We illustrate that a high-quality CC tape with non-magnetic substrate follows rather well the models developed for a thin strip. However, to meet an excellent agreement between experiment and theoretical prediction a detailed knowledge of the superconductor properties is necessary and a numerical method must be involved.In the case of a superconducting layer deposited on a ferromagnetic substrate theoretical predictions give only basic directions and one must rely on numerical simulations entirely. We demonstrate that, with the help of a dedicated analysis of experimental data, very good AC loss prediction is also possible for superconductor-ferromagnetic composites. Novel designs of coated conductor architectures can be developed in this way.

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Section: Ac Loss Of CC Tape On Magnetic Substratementioning

confidence: 97%

AC losses in coated conductors

Gömöry

Vojenčiak

Pardo

et al. 2010

Supercond. Sci. Technol.

122

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“…Claassen [26] has used a constant value of μ r = 100. The permeability of weakly ferromagnetic substrates has been measured [23], which has a parabolic dependence on the magnetic field, giving a maximum value of μ r = 200 at B a = 100 mT. The relative permeability of the substrate is therefore assumed to be μ r = 200 in this paper.…”

Section: Weakly Ferromagnetic Substratementioning

confidence: 99%

Numerical Computation of AC Losses and Flux Profiles in High-Aspect-Ratio Superconducting Strips in Perpendicular AC Magnetic Field

Thakur

Staines

Lakshmi

et al. 2009

IEEE Trans. Appl. Supercond.

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We present the results of finite-element modeling of a YBCO thin-film superconductor deposited on a nonmagnetic substrate and on a weakly ferromagnetic substrate. The model was implemented using commercial software to calculate the ac loss in the presence of a sinusoidal external magnetic field applied perpendicular to the surface of the superconducting tape. A strategy is demonstrated to overcome the difficulties in the finite-element method due to the high aspect ratio of the YBCO film by using the computed values of ac loss for thicker samples to extrapolate the results to the actual physical thickness of the superconductor (∼1 μm). The effect of the width of the weekly ferromagnetic substrate upon the ac loss of the superconductor film has also been studied.

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“…Owing to the J c distribution that is non uniform and anisotropic, the measured field distribution is not as symmetric as the calculated one. Note that the calculation assumes a relative permeability of the 75 µm Nickel substrate as 2 according to an extrapolation of Nickel permeability measurements in [5] and [6] in order to roughly consider its effect on trapped field distribution. In a trapped field of the real NMR system, > 2.35 T, the Nickel substrates will be fully saturated.…”

Section: Field Measurementmentioning

confidence: 99%

Trapped Field Characteristics of Stacked YBCO Thin Plates for Compact NMR Magnets: Spatial Field Distribution and Temporal Stability

Hahn

Kim

Ahn

et al. 2010

IEEE Trans. Appl. Supercond.

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This paper presents experimental and analytical results of trapped field characteristics of a stack of square YBCO thin film plates for compact NMR magnets. Each YBCO plate, 40 mm × 40 mm × 0.08 mm, has a 25-mm diameter hole at its center. A total of 500 stacked plates were used to build a 40-mm long magnet. Its trapped field, in a bath of liquid nitrogen, was measured for spatial field distribution and temporal stability. Comparison of measured and analytical results is presented: the effects on trapped field characteristics of the unsaturated nickel substrate and the non-uniform current distribution in the YBCO plate are discussed.

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Measurement of magnetic properties of Ni-alloy substrate of HTS coated conductor in LN2

Cited by 59 publications

References 6 publications

AC losses in coated conductors

AC losses in coated conductors

Numerical Computation of AC Losses and Flux Profiles in High-Aspect-Ratio Superconducting Strips in Perpendicular AC Magnetic Field

Trapped Field Characteristics of Stacked YBCO Thin Plates for Compact NMR Magnets: Spatial Field Distribution and Temporal Stability

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