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Caractérisation et modélisation des matériaux supraconducteurs à haute température critique

Abstract : The aim of this thesis is to optimize the process of magnetization of superconducting pellets at high critical temperature (SHTC) by pulsed field magnetization (PFM) in order to use them in applications in the field of electrical engineering. In the design phase of the inductor necessary to magnetize these SHTC pellets, modeling and simulation are strongly recommended to perform the necessary calculations of the various electrical characteristics of the magnetization system. Therefore, we have developed an analytical model to study the influence of the presence of a superconducting bulk on the value of the inductance of an induction coil in a ferromagnetic circuit. The aim is to solve the Laplace and Poisson equations in different regions of interest through the magnetic vector potential. The analytical resolution was performed (carried out) using a computer code developed under MATLAB where the results obtained were in good agreement with those obtained by numerical simulation under COMSOL. The inhomogeneity of YBaCuO type SHTC pellets in terms of critical current density Jc was also investigated. To do this, we carried out experiments on the magnetization of these bulks by the PFM method. We have shown that the flat surface containing the crystallization germ (seed) of these pellets is characterized by a higher Jc than the other surface. Also, we studied the influence of the position of the seed crystallization in the two-pellet characterization method.
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https://hal.univ-lorraine.fr/tel-03184464
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Submitted on : Monday, March 29, 2021 - 2:55:51 PM
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Mohamed Elbaa. Caractérisation et modélisation des matériaux supraconducteurs à haute température critique. Energie électrique. Université de Lorraine; Université de Laghouat (Algérie), 2020. Français. ⟨NNT : 2020LORR0196⟩. ⟨tel-03184464⟩

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