Etude des pertes dans les supraconducteurs à haute température critique

Abstract : The objective of this of thesis is the theoretical and experimental loss study in the high critical temperature superconductors (HTS). The specific characteristics of the SHTC led us to reflect on the validity of the formulas of self field losses deduced from Bean model, for a sinusoidal and non sinusoidal current. We sought to know the distribution of current and the losses in the tube. Using the numerical results of losses, and dimensional analysis, we obtained a new relation giving the losses in incomplete penetration. In the experimental part, we observe that the losses do not depend on the current shape, if Imax<1,3*IC. If Imax>1,3*IC the shape of the current intervenes on the value of the losses. In the last part, we compared measurements with calculations of losses, in sinusoidal mode. We checked that the losses measured and calculated with this distribution of current, are rather close.
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Bruno Douine. Etude des pertes dans les supraconducteurs à haute température critique. Autre. Université Henri Poincaré - Nancy 1, 2001. Français. ⟨NNT : 2001NAN10180⟩. ⟨tel-01754430⟩

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