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Conception d’un aimant supraconducteur MgB₂ à hauts champs

Abstract : Helium shortage is an issue for superconducting magnets and drives superconducting magnet designer to find other types of effective superconductors that could be used in conduction-cooled magnets.MgB₂ is a promising superconducting material and could fill the demand. MgB₂ was discovered in2001, its critical temperature (39 K) as well as its mass production of a variety of shapes (ribbons, films, cables, wires…) over long length makes MgB₂ a competitive substitute to historical low temperature superconductors such as NbTi and Nb₃Sn in magnets. Although promising, MgB₂ conductors still need mechanical improvement compared to NbTi's and their performance in practical applications has yet to be demonstrated especially for low bending radius magnets. This thesis aims to design and builda MgB₂ conduction-cooled prototype generating a 2 T on the axis on its own in a 3 T background field. Three lengths of conductors were fused by two resistive junctions at the very heart of the winding challenging the design and the fabrication because of the thermal issues. The thesis focuses on three main topics. First, superconducting and mechanical performances of several MgB₂ conductors candidates for the prototype are analyzed and discussed. The design calculation (magnetic, mechanical,thermalization of the prototype and protection) and all the fabrication process (winding, instrumentation, thermal apparatus and impregnation) are presented. In order to validate the fabrication steps and the performances of the prototype, the protoype is tested and the results discussed in the last chapter.
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Submitted on : Thursday, December 12, 2019 - 11:23:08 AM
Last modification on : Tuesday, September 29, 2020 - 6:56:53 AM
Long-term archiving on: : Friday, March 13, 2020 - 9:23:07 PM


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  • HAL Id : tel-02406762, version 1


Julien Avronsart. Conception d’un aimant supraconducteur MgB₂ à hauts champs. Matériaux et structures en mécanique [physics.class-ph]. Université Paris Saclay (COmUE), 2019. Français. ⟨NNT : 2019SACLS292⟩. ⟨tel-02406762⟩



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