3-D Numerical Modeling of AC Losses in Multifilamentary MgB2 Wires

Guillaume Escamez, Frédéric Sirois, Valtteri Lahtinen, Antti Stenvall, Arnaud Badel, Pascal Tixador, Brahim Ramdane, Gérard Meunier, Rémy Perrin-Bit, Christian Éric Bruzek

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Due to their high-current-carrying capacity, round geometry, and low cost, MgB2 wires are promising candidates for realizing high-power cables. However, their operating temperature between 4.2 K and 25 K makes ac losses a critical issue for those cables. To optimize the cable architecture for minimizing ac losses, one must be able to predict them quite accurately. As a first step in this direction, we addressed the numerical computation of a single multifilamentary MgB2 wire that forms the basic element of a high-current cable. The wire under consideration has 36 twisted MgB2 filaments disposed on three concentric layers and embedded in a pure-nickel matrix. An initial comparison between 2-D and 3-D finite elements was performed to justify the need for a full 3-D model, without which coupling losses in the matrix cannot be modeled properly. This is of prime importance since coupling loss is the dominant loss mechanism at high applied fields. Then, simulations of simpler geometries (6- and 18-filament wires) submitted to various transport currents and/or applied fields were performed to identify trends in ac losses and find the best numerical tools for scaling up simulations to the full 36-filament case. The complexity of the model was progressively increased, starting with MgB2 filaments in the air matrix and then adding electrical conductivity and magnetic properties in the nickel matrix.

Original languageEnglish
Article number7422024
JournalIEEE Transactions on Applied Superconductivity
Volume26
Issue number3
DOIs
Publication statusPublished - 2016 Apr
Externally publishedYes

Keywords

  • AC losses
  • FEM modelling
  • MgB2
  • power cable

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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  • Cite this

    Escamez, G., Sirois, F., Lahtinen, V., Stenvall, A., Badel, A., Tixador, P., Ramdane, B., Meunier, G., Perrin-Bit, R., & Bruzek, C. É. (2016). 3-D Numerical Modeling of AC Losses in Multifilamentary MgB2 Wires. IEEE Transactions on Applied Superconductivity, 26(3), [7422024]. https://doi.org/10.1109/TASC.2016.2533024