Enhancing electric field calculation in HTS tape simulations for currents exceeding the critical limit using full HTS tape modeling

dos Santos, Gabriel; Santos, Bárbara Maria Oliveira

doi:10.1016/j.physc.2024.1354518

Physica C: Superconductivity and its Applications

2024

DOI: 10.1016/j.physc.2024.1354518

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Enhancing electric field calculation in HTS tape simulations for currents exceeding the critical limit using full HTS tape modeling

Gabriel dos Santos,

Bárbara Maria Oliveira Santos

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Cited by 2 publications

References 46 publications

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A frequency-domain finite element model for simulating high temperature superconductors using the J-A and T-A formulations

dos Santos,

Trillaud

2024

Supercond. Sci. Technol.

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The AC losses, the current density and the magnetic field are important variables to design devices made of High Temperature Superconductors (HTS). These variables are often numerically computed using a transient finite element analysis even though the interest may lay in the steady-state regime of the device. The need for solving time-dependent variables has led to improve the computation time with efficient finite element models (FEM) relying on different formulations. These transient FEM are computationally slow and demanding in terms of resources. In the present work, an alternative path is taken with the development of a frequency-domain FEM using a phasor representation to alleviate the computation burden. This model does not have the versatility of the transient models. However, it can generate the initial steady-state conditions for a subsequent transient analysis. It is perfectly adapted to study the steady-state regime of HTS devices operated in AC conditions. In this phasor modelling approach, the Root Mean Square (RMS) resistivity of the superconductor is introduced. It is subsequently approximated by an exponential function introducing a factor to ease its implementation in the commercial software COMSOL Multiphysics with the most recent and fastest formulations T-A and J-A. The case studies encompass single BSCCO and REBCO tapes as well as a CORC cable or specifically, in the present work, a CORT (Conductor on Round Tube). The results of the time- and frequency-domain FEM simulations are compared against experimental data. The comparison of the models' results is carried out comparing the current density distributions as well as the AC losses. The comparison against experimental data is only conducted on the AC losses. In the present case, it is used to quantify thoroughly the accuracy of the numerical results compared to the measurements. A reasonable agreement between those results and the experimental data was found. 

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A frequency-domain finite element model for simulating high temperature superconductors using the J-A and T-A formulations

dos Santos,

Trillaud

2024

Supercond. Sci. Technol.

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Electromagnetic-thermal modeling of high-temperature superconducting coils with homogenized method and different formulations: a benchmark

Dadhich,

Grilli,

Denis

et al. 2024

Supercond. Sci. Technol.

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High-temperature superconducting coils are used in various large-scaleapplications, like rotating machines and high-field magnets. However, modelingthese coils is a complicated and time-consuming process, especially due to the non-linearity of the current-voltage characteristics of the superconductors and the complexmultiphysics involved. In this work, we used a fast homogenized method to modelthe coupled electromagnetic and electrothermal properties of racetrack and pancakecoils for different applications. For this purpose, various formulations wieldinghomogenization methods are used and benchmarked with each other, as well as withmodels considering the detailed structure of the HTS tapes. We observe a very goodagreement between different models (homogenized and detailed), and we discuss thepros and cons of the inclusion of insulating layers between the turns in homogenization.This work was performed under the collaboration of the COST action modeling teamsand can be used as a review of the state-of-the-art superconductor modeling techniques,and a source for the development and benchmark of future numerical methods.

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Enhancing electric field calculation in HTS tape simulations for currents exceeding the critical limit using full HTS tape modeling

Cited by 2 publications

References 46 publications

A frequency-domain finite element model for simulating high temperature superconductors using the J-A and T-A formulations

A frequency-domain finite element model for simulating high temperature superconductors using the J-A and T-A formulations

Electromagnetic-thermal modeling of high-temperature superconducting coils with homogenized method and different formulations: a benchmark

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