Modelling HTc superconductors for AC power loss estimation

Sykulski, J.K.; Stoll, R.L.; Mahdi, Abdulhussain E.; Please, Colin P.

doi:10.1109/20.582565

Cited by 30 publications

(21 citation statements)

References 4 publications

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“…͑1͒, but also n and frequency f. In order to know the relation among these quantities, scaling laws have been studied by Rhyner and Sykulski et al 11,12 for the cases of infinite-semispace and infinite-slab bodies. Since essential parameters for long superconductors with a finite cross section are not considered, their results are hardly used by experimentalists.…”

Section: Alternating Current Loss In a Cylinder With Power-law Currenmentioning

confidence: 99%

Alternating current loss in a cylinder with power-law current-voltage characteristic

Chen

2005

Applied Physics Letters

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The transport ac loss Q in a superconducting cylinder of radius a with a power-law current-voltage characteristic E=Ec∣J∕Jc∣n as a function of current amplitude Im is numerically calculated for a set of given values of a,Jc, and frequency f at n=5, 10, 20, and 30. After deriving a scaling law and defining a critical frequency fc, the results can be converted and interpolated to those for any values of a, Jc, f, and 5⩽n⩽30. The “power-law” Q(Im) at f=fc is a better alternative of the critical-state Q(Im), used not only for describing the features of Q(Im,f) of high-temperature superconductors but also for planning Q measurements and their interpretation.

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Section: Alternating Current Loss In a Cylinder With Power-law Currenmentioning

confidence: 99%

Alternating current loss in a cylinder with power-law current-voltage characteristic

Chen

2005

Applied Physics Letters

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“…2,3 In that model, the flux creep is formulated in terms of a nonlinear diffusion of magnetic flux through the HTS tape. The tape is modeled as a nonlinear conductor whose equivalent resistivity is derived from an E-J characteristic which is, in turn, deduced from the Anderson-Kim model describing the flux creep.…”

Section: Introductionmentioning

confidence: 99%

Modeling of magnetic properties and alternate current losses in high-Tc superconductors using a power law voltage–current characteristic

Mahdi

Tami

Stoll

1999

Journal of Applied Physics

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This article presents numerical diffusion models which describe the electromagnetic properties and alternate current ͑ac͒ losses of a high-T c superconducting tape carrying transport current. The models simulate the tape as a highly nonlinear conductor with equivalent resistivity being a function of J, the local current density, as deduced from a power law E-J characteristic of the material. The power law E-J expression can be adjusted by varying both the power, ␣, and the value of the critical current density, J c , to accurately fit the current-voltage characteristic of a given high-T c superconducting tape, as obtained from direct current measurements. Results of various field quantities, in the interior of the tape, and losses for a range of ac currents and frequencies are presented and discussed in conjunction with the critical state, flux creep, and flux flow theories of high-T c materials.

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“…Sykulski et al [27] modelled AC losses in HTS as a highly non-linear diffusion process (1-D only). They presented formulations in terms of both H and E and they argued, using dimensional analysis, that working with E is numerically more efficient.…”

Section: Is There Any Optimal Choice For Modelling Hts Devices?mentioning

confidence: 99%

Potential and limits of numerical modelling for supporting the development of HTS devices

Sirois¹,

Grilli²

2015

Supercond. Sci. Technol.

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In this paper, we present a general review of the status of numerical modelling applied to the design of high temperature superconductor (HTS) devices. The importance of this tool is emphasized at the beginning of the paper, followed by formal definitions of the notions of models, numerical methods and numerical models. The state-of-the-art models are listed, and the main limitations of existing numerical models are reported. Those limitations are shown to concern two aspects: one the one hand, the numerical performance (i.e. speed) of the methods themselves is not good enough yet; on the other hand, the availability of model file templates, material data and benchmark problems is clearly insufficient. Paths for improving those elements are provided in the paper. Besides the technical aspects of the research to be further pursued, for instance in adaptive numerical methods, most recommendations command for an increased collective effort for sharing files, data, codes and their documentation.

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Modelling HTc superconductors for AC power loss estimation

Cited by 30 publications

References 4 publications

Alternating current loss in a cylinder with power-law current-voltage characteristic

Alternating current loss in a cylinder with power-law current-voltage characteristic

Modeling of magnetic properties and alternate current losses in high-Tc superconductors using a power law voltage–current characteristic

Potential and limits of numerical modelling for supporting the development of HTS devices

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