Strong reduction of ac losses in a superconductor strip located between superconducting ground plates

Genenko, Yuri A.

doi:10.1016/j.physc.2003.09.039

Cited by 3 publications

(3 citation statements)

References 21 publications

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“…It was found that the effects on the current density distribution inside the superconductor mostly depend on the barrier's shape and distance from the superconductor, and only marginally on its magnetic permeability. The method was later used to propose configurations aiming at increasing the transport capability [278] and reducing the ac losses [279] of superconducting strips. The above mentioned models, however, consider magnetic domains that are not embedded in the structure of the tape or wire, and as such they are not suitable to describe technical conductors used in applications, such as for example coated conductors with magnetic substrate or MgB 2 wires with magnetic material.…”

Section: A Analytical Modelsmentioning

confidence: 99%

Computation of Losses in HTS Under the Action of Varying Magnetic Fields and Currents

Grilli

Pardo

Stenvall

et al. 2014

IEEE Trans. Appl. Supercond.

314

272

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Numerical modeling of superconductors is widely recognized as a powerful tool for interpreting experimental results, understanding physical mechanisms and predicting the performance of high-temperature superconductor (HTS) tapes, wires and devices. This is especially true for ac loss calculation, since a sufficiently low ac loss value is imperative to make these materials attractive for commercialization. In recent years, a large variety of numerical models, based on different techniques and implementations, have been proposed by researchers around the world, with the purpose of being able to estimate ac losses in HTSs quickly and accurately. This article presents a literature review of the methods for computing ac losses in HTS tapes, wires and devices. Technical superconductors have a relatively complex geometry (filaments, which might be twisted or transposed, or layers) and consist of different materials. As a result, different loss contributions exist. In this paper, we describe the ways of computing such loss contributions, which include hysteresis losses, eddy current losses, coupling losses, and losses in ferromagnetic materials. We also provide an estimation of the losses occurring in a variety of power applications.

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Section: A Analytical Modelsmentioning

confidence: 99%

Computation of Losses in HTS Under the Action of Varying Magnetic Fields and Currents

Grilli

Pardo

Stenvall

et al. 2014

IEEE Trans. Appl. Supercond.

314

272

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“…i tan i + ln cos i (13) ensues. The quadratic prefactor herein describes the hysteretic ac loss as for a superconductor strip between two parallel superconducting shields [20].…”

Section: Transverse Shielding Geometrymentioning

confidence: 99%

Hysteretic ac losses in a superconductor strip between flat magnetic shields

Genenko¹,

Rauh²

2010

Supercond. Sci. Technol.

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Hysteretic ac losses in a thin, current-carrying superconductor strip located between two flat magnetic shields of infinite permeability are calculated using Bean's model of the critical state. For the shields oriented parallel to the plane of the strip, penetration of the self-induced magnetic field is enhanced, and the current dependence of the ac loss resembles that in an isolated superconductor slab, whereas for the shields oriented perpendicular to the plane of the strip, penetration of the self-induced magnetic field is impaired, and the current dependence of the ac loss is similar to that in a superconductor strip flanked by two parallel superconducting shields. Thus, hysteretic ac losses can strongly augment or, respectively, wane when the shields approach the strip.

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“…Advantageous effects produced by a soft ferromagnetic (FM) sheath on a superconductor (SC) have been described in a series of recent theoretical papers [1][2][3][4][5][6][7][8]. Subsequent experimental spatially resolved studies on YBa 2 Cu 3 O 7-δ thin films [8][9] and MgB 2 wires [10,11] proved the enhanced screening properties and increase of the critical current in SC/FM structures.…”

Section: Introductionmentioning

confidence: 99%

Magneto-optical investigations of Ag-sheathed Bi-2223 tapes with ferromagnetic shielding

Yurchenko

Shantsev

Galperin

et al. 2007

Physica C: Superconductivity

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An increase in the critical current and suppression of AC losses in superconducting wires and tapes with soft magnetic sheath have been predicted theoretically and confirmed experimentally. In this work we present the results of magneto-optical investigations on a series of Ag-sheathed Bi-2223 tapes with Ni coating. We visualize distributions of magnetic field at increasing external field and different temperatures, demonstrating a difference between the flux propagation in the superconductor with Ni rims and a reference sample without Ni coating.

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Strong reduction of ac losses in a superconductor strip located between superconducting ground plates

Cited by 3 publications

References 21 publications

Computation of Losses in HTS Under the Action of Varying Magnetic Fields and Currents

Computation of Losses in HTS Under the Action of Varying Magnetic Fields and Currents

Hysteretic ac losses in a superconductor strip between flat magnetic shields

Magneto-optical investigations of Ag-sheathed Bi-2223 tapes with ferromagnetic shielding

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