Auswahl der wissenschaftlichen Literatur zum Thema „Modes de déchirement“
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Zeitschriftenartikel zum Thema "Modes de déchirement"
Lüsebrink, Hans-Jürgen. „Fernand Dumont face à la culture populaire. Écriture de la nostalgie et usages socioculturels“. Dossier 27, Nr. 1 (03.10.2006): 48–58. http://dx.doi.org/10.7202/201581ar.
Der volle Inhalt der QuelleDissertationen zum Thema "Modes de déchirement"
Akramov, Tohir. „La reconnexion magnétique explosive dans les nappes de courant multiples : application à l'environnement des pulsars“. Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAE012/document.
Der volle Inhalt der QuelleThe Crab Nebula, containing in its center a highly magnetized neutron star - the Crab pulsar, was essentially considered as a standard steady-state candle in gamma rays. Recently, this point of view has been challenged by gamma-ray flares observed by space satellites AGILE/Fermi-LAT. Even if the relativistic magnetic wind of the pulsar is considered to be the source of energy, the physical mechanism underlying these eruptive events is still a mystery. In this thesis, we improved the understanding of a mechanism based on fast magnetic reconnection, starting from the model of the magnetic wind generated by the central pulsar which loses its rotational kinetic energy. Indeed, the structure of the magnetic wind implies the presence of stripes with magmatic field lines of alternating polarities (hence the name "striped wind") through the equatorial plane of the pulsar. In a simplified local model, we assume the initiation of the dynamics from a double-current sheet configuration (induced by the magnetic structure) in the striped wind reference
Frey, Marc. „Évolution quasi-linéaire d'un mode de déchirement : rôle de l'inertie, tendance à la saturation, diffusion thermique à travers l'îlot magnétique“. Paris 11, 1985. http://www.theses.fr/1985PA112080.
Der volle Inhalt der QuelleIn this thesis, the quasi-linear growth of resistive magnetohy-drodynamic instabilities (Tearing modes) in confined plasmas is investigated. The Tearing mode leads to the formation of magnetic islands. We study the role of inertia in the growth of the island, the possibility of non-linear saturation, and the effects of heat flow through the magnetic island
Betar, Homam. „Kinetic Effects in Magnetic Reconnection“. Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0043.
Der volle Inhalt der QuellePlasmas are gaseous systems of ions and electrons which interact via electromagnetic fields and display collective properties. Among these, is the notion of the magnetic line "connection". This expresses the fact that, in regimes in which charged particles spiral sufficiently fast along lines of magnetic induction, the latter is linked to the bulk plasma motion and acquire a topological identity which forbids them to break, intersect and reconnect. This topological identity, however, can be locally violated thanks to a number of kinetic effects, such as particle collisions, when the currents in the plasma are sufficiently intense: one speaks of "magnetic reconnection". Magnetic reconnection is an important ingredient of the plasma self-organization and has significance for both space and laboratory plasmas since it is at the basis of natural phenomena like solar flares and polar lights, or of disruptive processes in thermonuclear fusion experiments. A long-standing problem in the study of laboratory and astrophysical plasmas is to understand the mechanisms of acceleration of electrons and ions, as a magnetic field reconnect and release energy. In this work, we studied kinetic effects on reconnection instabilities developing spontaneously in static current sheets (tearing modes) and in combination with a class of kinetic instabilities (Weibel instabilities) that are relevant both to astrophysical plasma jets and to laser-plasma interaction experiments. We performed this study using reduced-fluid and kinetic models and we investigated the competition between tearing-type modes and Weibel-type instabilities by means of both semi-lagrangian full kinetic Vlasov-Maxwell simulations and particles in cell simulations
Poye, Alexandre. „Dynamique des ilots magnétiques en présence de feuille de courant et en milieu turbulent“. Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4793/document.
Der volle Inhalt der QuelleThe fusion plasma stability is a critical point for the developpement of newenergy source. The interaction between the plasma and the magnetic field can drive to the confinement descrution : it is a disruption. The topic of this thesis is the magnetic island, one of disruption causes. Those magnetic islands are observed theoretically and numerically. The theory can predict the growth and the final size of magnetic islands, but restrictions of its validity range are strong and they decorrelate the experimental and theoritical validity domain. In the first part, we show that the dynamic method of magnetic island control, based on the link between the island size and the perturbed magnetic flux at the resonance, should take in account the modification of the magnetic flux averaged along the field line. We show aswell the limitation of our assertion (magnetic island coalescence, X point collapse ...). The second part of the thesis address a new effet du to the current on sides of the magnetic island. This effect changes the magnetic island dynamics and the perception we got on it. Until now, the magnetic island dynamics have been studied through active mechanisms at the resonance. We show that the presence of current on sides can play an important role on the growth and saturation of the magnetic island. The last part of thesis details how the turbulence on the outskirts of a magnetic island can affect the island growth. We show that a turbulence generate by an interchange instability can penetrate into a stable zone concerning tearing mode and induce by a 3D mechanisme the growth of an magnetic island
Hamed, Myriam. „Electron heat transport in tokamak H-mode pedestals“. Electronic Thesis or Diss., Aix-Marseille, 2019. http://theses.univ-amu.fr.lama.univ-amu.fr/191128_HAMED_534gjvrc761ijwn176jbu525de_TH.pdf.
Der volle Inhalt der QuelleIn H-mode plasmas, the modeling of the pedestal dynamics is an important issue to predict temperature and density profiles in the tokamak edge and therefore in the core. The EPED model, based on the stability of large scales MagnetoHydroDynamic (MHD) modes, is most commonly used to characterize the pedestal region. The EPED model has been successful until now. However, EPED model does not take into account small scales instabilities linked the the sharp pressure gradient and the pedestal characteristics prediction in terms of width and height is still open. Moreover, some recent analysis of JET plasmas suggest that another class of instabilities, called microtearing modes, may be responsible for electron heat transport in the pedestal, and thereby play some role in determining the pedestal characteristics. Microtearing modes belong to a class of instabilities where a modification of the magnetic field line topology is induced at the ion Larmor radius scale. This leads to the formation of magnetic islands, which can enhance the electron heat transport. The stability of MTMs has been theoretically studied in the past showing that a slab current sheet is stable in the absence of collisions. In contrast, recent gyrokinetic simulations in toroidal geometry found unstable MTMs, even at low collisionality. The purpose of our work is to improve the MTM stability understanding by comparing new analytical theory to linear gyrokinetic simulations. More precisely, physical mechanisms (magnetic drift, electric potential) are progressively included in the analytical description to recover the numerical simulations results and to "reconcile" numerical MTM investigations with theory