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Master thesis

Aimantation de pastilles supraconductrices à l'aide d'une décharge impulsionnelle

Abstract : While conventional permanent magnets only reach about 2 T, a Japanese research group has already managed to trap 17 T in a superconducting bulk at 29 K. The Pulsed Field Magnetization (PFM) is one such technique of magnetization. This is based on the ability of superconducting bulk to keep part of the magnetic field after a pulse discharge from RLC circuit. The purpose of this report is to implement this magnetization technique in GREEN laboratory. After studying various articles about this method of magnetization, we initially carried out simulations to determine the levels of intensity and magnetic field. We realized then vortex coils, specially designed for PFM. We will explain in the report the reasons that urged us to adopt this type of coil. In a second step, we performed the complete device of the PFM, that is to say, the retaining sheets for coils, bulk, Hall sensors, and a small coil to measure the dynamic magnetic field. Finally, we conducted experiments with different bulks and different tensions. We managed to trap 275 mT in a drilled bulk. These experiments highlight the importance of the quality of the bulk and the circuit to successfully trap more magnetic field.
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Master thesis
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http://docnum.univ-lorraine.fr/public/SCDSCI_M_2011_GALAND_ERIC.pdf
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Eric Galand. Aimantation de pastilles supraconductrices à l'aide d'une décharge impulsionnelle. Sciences de l'ingénieur [physics]. 2011. ⟨hal-01876722⟩

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