Littérature scientifique sur le sujet « Supraconducteur Nb3Sn »
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Articles de revues sur le sujet "Supraconducteur Nb3Sn"
Taillard, R., et A. I. Ustinov. « Germination et texture du composé supraconducteur Nb3Sn ». Journal de Physique IV (Proceedings) 12, no 6 (juillet 2002) : 115–24. http://dx.doi.org/10.1051/jp4:20020219.
Texte intégralThèses sur le sujet "Supraconducteur Nb3Sn"
Abdel, Hafiz Mahmoud. « Étude de l'état mécanique des conducteurs en Nb3Sn durant le traitement thermique pour les futurs électro-aimants d'accélérateurs ». Electronic Thesis or Diss., université Paris-Saclay, 2023. http://www.theses.fr/2023UPAST221.
Texte intégralThe Nb3Sn phase is a superconducting material used in the fabrication of high-field electro-magnet conductors, and is essential for future particle accelerators. Several methods exist for shaping these conductors, but all require a heat treatment at temperatures above 600°C in order to forme the Nb3Sn. During this heat treatment, different intermediate phases appear, resulting an evolution of conductors deformations. It is necessary to quantify these deformations to ensure the integrity of the electro-magnet and the generated magnetic field. However, the underlying mechanisms behind these deformations are not yet fully understood, and currently, there is no model available to estimate the thermo-mechanical state of the conductor during the heat treatment.The present work focuses on studying the mechanical phenomena occuring during the heat treatment of Nb3Sn conductors. A microscopic analysis of the phenomena was conducted at the sub-element level, allowing the identification and quantification of phase change dynamics. An experimental measurement in situ of cable and strand deformations using digital image correlation was performed. The longitudinal dimensional changes confirmed behaviors reported in the literature for similar conductors and provided, for the first time, values for transverse dimensional changes. A thermo-chemo-elastic modeling of the strand was proposed, taking into account the phase change phenomena at the sub-element scale, as well as the thermomechanical state at the strand scale. These models provide, for the first time, an estimation of the mechanical state of a conductor during thermal processing. Further enrichment of the models is necessary to better align with experimental observations
Guyot, Sylvain. « Importance du design pour la transformation de phase, la microstructure et le comportement supraconducteur des composites à base de Nb3Sn fabriqués suivant le procédé bronze ». Lille 1, 2005. https://pepite-depot.univ-lille.fr/RESTREINT/Th_Num/2005/50376_2005_361.pdf.
Texte intégralOtmani, Rachid. « Etude de câbles Nb3Sn pour quadripôles supraconducteurs ». Grenoble INPG, 1999. http://www.theses.fr/1999INPG0130.
Texte intégralPuigsegur, Alexandre. « Isolation céramique pour câbles supraconducteurs en Nb3Sn ». Montpellier 2, 2005. http://www.theses.fr/2005MON20167.
Texte intégralLenoir, Gilles. « Caractérisation et modélisation du comportement mécanique de matériaux supraconducteurs ». Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLC044/document.
Texte intégralSuperconducting cables are widely used in high field magnets and have recently been extended to electricity transport. Cables are composed of a complex assembly of superconducting strands, themselves composed of superconducting filaments twisted in a metallic matrix and surrounded by an outerlayer. The electrical-strain dependence of individual strands is known to be responsible for the degradation of the electrical performance of cables. Thus, it is necessary to understand and predict the mechanical behavior at the strand scale to predict the electrical properties and optimize the manufacturing process of cables to achieve higher fields and better transport capabilities.A multi-scale mechanical characterization of Nb3Sn and MgB2 strands was carried out through tests on complete strands and strands without an outer-layer. A specific device was developed for uniaxial tests on small brittle wire. Nano-indentation tests were also carried out to access to the local properties of each material in the strand.A strategy for the modeling and identification of the mechanical behavior of strands was developed. The model is based on a simplified representation of the structure built from the component volume fractions and the nanoindentation tests. The identification of the parameters is carried out using the experimental database previously developed. The model is intended to be subsequently used to simulate the coupled mechanical and electrical behavior of cables.Discussion about damage phenomenon in strands is carried out through the study of strain localization observed in strands, observations and analyses after interrupted tests, and tensile tests performed in an X-ray tomograph
Verwaerde, Christophe. « Transformations de phases au cours de la fabrication de composites supraconducteurs Nb3Sn ». Lille 1, 1996. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/1996/50376-1996-256.pdf.
Texte intégralFelice, Hélène. « Contribution à la conception des bobinages supraconducteurs de type dipolaire en Nb3Sn pour les accélérateurs de particules ». Vandoeuvre-les-Nancy, INPL, 2006. http://docnum.univ-lorraine.fr/public/INPL/2006_FELICE_H.pdf.
Texte intégralImprovement of particle accelerators relies on complex technologies suffi as the design and fabrication of superconducting magnets. A key parameter in magnet design is the mechanical pre-stress, applied at room temperature to insure compression of the coil during excitation. Ln dipole magnets, high field and high mechanical stresses in windings combined with the Nb3Sn stress sensitivity ask the question of the limit of the mechanical stress that the Nb3Sn can undergo without degradation. This limit estimated around 150 MPa is still discussed and has to be investigated. Whatever its value, preliminary studies show that conventional cosine theta design induces mechanical stresses (> 200 MPa) in large aperture (> 130 mm) and high field configurations, which underscore the need of alternative coil arrangements. The first part of this thesis gives an introduction to the issues and challenges encountered by the designers of superconducting magnets. The second part is devoted to the study of large aperture (88, 130 and 160 mm) and high field (13T) dipoles based on intersecting ellipses. After a theoretical study, a 2D magnetic design is detailed for each aperture and a mechanical study is developed for the 130 mm aperture dipole. Ln the last part, an experimental device dedicated to the study of the influence of the pre-stress on the training of subscale Nb3Sn dipole and to the investigation of the mechanical stress limit is presented. The design of this magnet is detailed and the result of the first test carried out with the structure is reported
Felice, Hélène Mailfert Alain. « Contribution à la conception des bobinages supraconducteurs de type dipolaire en Nb3Sn pour les accélérateurs de particules ». Vandoeuvre-les-Nancy : INPL, 2006. http://www.scd.inpl-nancy.fr/theses/2006_FELICE_H.pdf.
Texte intégralZhang, Chaowu. « Étude de l'optimisation et de la cinétique de formation de conducteurs supraconducteurs Nb3Sn obtenus par la méthode de l'étain interne ». Grenoble 1, 2007. http://www.theses.fr/2007GRE10112.
Texte intégralSuperconductors Nb3Sn wires are one of the most applicable cryogenic superconducting materials and the best choice for high-field magnets exceeding 10T. One of the most significant utilization is the ITER project which is regarded as the hope of future energy source. The high-Cu composite designs with smaller number of sub-element and non-reactive diffusion barrier, and the RRP (Restacked Rod Process) internal-Sn technology are usually applied for the wire manufacturing. Such designed and processed wires were supplied by MSA/Alstom and WST/NIN in this research. The systematic investigation on internal-Sn superconducting wires includes the optimization of HT conditions, phase formation and its relation with superconductivity, microstructure analysis, and the phase formation kinetics. Because of the anfractuosity of the configuration design and metallurgical processing, the MF wires are not sufficient for studying a sole factor effect on superconductivity. Therefore, four sets of ME wires with different Sn ratios and different third-element addition were designed and fabricated in order to explore the relationship between phase formation and superconducting performances, particularly the A15 layer growth kinetics. Different characterization technics have been used (magnetization measurements, neutron diffraction and SEM/TEM/EDX analysis)The A15 layer thicknesses of various ME samples were measured and carried out linear and non-linear fits by means of two model equations. The results have clearly demonstrated that the phase formation kinetics of Nb3Sn solid-state reaction is in accordance with an n power relation and the n value is increased with the increase of HT temperature and the Sn ratio in the wire composite
Rochepault, Etienne. « Étude de dipôles supraconducteurs en Nb3Sn à haut champ : isolation électrique à base de céramique et conception magnétique ». Thesis, Paris 11, 2012. http://www.theses.fr/2012PA112210/document.
Texte intégralIn the framework of LHC upgrades, significant efforts are provided to design accelerator magnets using the superconducting alloy Nb3Sn, which allows to reach higher magnetic fields (>12T). The aim of this thesis is to propose new computation and manufacturing methods for high field Nb3Sn dipoles. A ceramic insulation, previously designed at CEA Saclay, has been tested for the first time on cables, in an accelerator magnet environment. Critical current measures, under magnetic field and mechanical stress, have been carried out in particular. With this test campaign, the current ceramic insulation has been shown to be too weak mechanically and the critical current properties are degraded. Then a study has been conducted, with the objective to improve the mechanical strength of the insulation and better distribute the stress inside the cable. Methods of magnetic design have also been proposed, in order to optimize the coils shape, while fulfilling constraints of field homogeneity, operational margins, forces minimization… Consequently, several optimization codes have been set up. They are based on new methods using analytical formulas. A 2D code has first been written for block designs. Then two 3D codes have been realized for the optimization of dipole ends. The former consists in modeling the coil with elementary blocs and the latter is based on a modeling of the superconducting cables with ribbons. These optimization codes allowed to propose magnetic designs for high field accelerator magnets
Chapitres de livres sur le sujet "Supraconducteur Nb3Sn"
« Chapitre 3 – Fils et câbles supraconducteurs métalliques Nb – Ti, Nb3Sn, MgB2 ». Dans Applications magnétoélectriques des supraconducteurs, 43–80. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-2221-8-008.
Texte intégral« Chapitre 3 – Fils et câbles supraconducteurs métalliques Nb – Ti, Nb3Sn, MgB2 ». Dans Applications magnétoélectriques des supraconducteurs, 43–80. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-2221-8.c008.
Texte intégral