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Artykuły w czasopismach na temat "Instabilités de type Weibel"
Lazar, M., R. Schlickeiser, R. Wielebinski i S. Poedts. "COSMOLOGICAL EFFECTS OF WEIBEL-TYPE INSTABILITIES". Astrophysical Journal 693, nr 2 (5.03.2009): 1133–41. http://dx.doi.org/10.1088/0004-637x/693/2/1133.
Pełny tekst źródłaMirón-Granese, Nahuel, Esteban Calzetta i Alejandra Kandus. "Primordial Weibel instability". Journal of Cosmology and Astroparticle Physics 2022, nr 01 (1.01.2022): 028. http://dx.doi.org/10.1088/1475-7516/2022/01/028.
Pełny tekst źródłaOKADA, T., I. SAJIKI i K. SATOU. "Weibel instability by ultraintense laser pulses". Laser and Particle Beams 17, nr 3 (lipiec 1999): 515–18. http://dx.doi.org/10.1017/s0263034699173191.
Pełny tekst źródłaBaumjohann, W., R. Nakamura i R. A. Treumann. "Magnetic guide field generation in collisionless current sheets". Annales Geophysicae 28, nr 3 (16.03.2010): 789–93. http://dx.doi.org/10.5194/angeo-28-789-2010.
Pełny tekst źródłaSUGIE, M., K. OGAWA i T. OKADA. "DEVELOPMENT OF ELECTROMAGNETIC WEIBEL-TYPE INSTABILITIES IN ANISOTROPIC PLASMAS". International Journal of Modern Physics B 21, nr 03n04 (10.02.2007): 637–41. http://dx.doi.org/10.1142/s0217979207042458.
Pełny tekst źródłaLAZAR, M., A. SMOLYAKOV, R. SCHLICKEISER i P. K. SHUKLA. "A comparative study of the filamentation and Weibel instabilities and their cumulative effect. I. Non-relativistic theory". Journal of Plasma Physics 75, nr 1 (luty 2009): 19–33. http://dx.doi.org/10.1017/s0022377807007015.
Pełny tekst źródłaLazar, M., R. Schlickeiser i T. Skoda. "Cosmological magnetic field seeds produced by the Weibel instabilities". Proceedings of the International Astronomical Union 6, S271 (czerwiec 2010): 387–88. http://dx.doi.org/10.1017/s1743921311017923.
Pełny tekst źródłaInglebert, A., A. Ghizzo, T. Reveille, D. Del Sarto, P. Bertrand i F. Califano. "A multi-stream Vlasov modeling unifying relativistic Weibel-type instabilities". EPL (Europhysics Letters) 95, nr 4 (28.07.2011): 45002. http://dx.doi.org/10.1209/0295-5075/95/45002.
Pełny tekst źródłaSkoutnev, V., A. Hakim, J. Juno i J. M. TenBarge. "Temperature-dependent Saturation of Weibel-type Instabilities in Counter-streaming Plasmas". Astrophysical Journal 872, nr 2 (21.02.2019): L28. http://dx.doi.org/10.3847/2041-8213/ab0556.
Pełny tekst źródłaSarrat, M., D. Del Sarto i A. Ghizzo. "Fluid description of Weibel-type instabilities via full pressure tensor dynamics". EPL (Europhysics Letters) 115, nr 4 (1.08.2016): 45001. http://dx.doi.org/10.1209/0295-5075/115/45001.
Pełny tekst źródłaRozprawy doktorskie na temat "Instabilités de type Weibel"
Sarrat, Mathieu. "Physique des instabilités de type Weibel". Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0162/document.
Pełny tekst źródłaWeibel-type instabilities occurs when the velocity distribution function of the charged particles displays a pronounced anisotropy. A long-lasting magnetic field is generated due to the formation of current filaments, and it is accompanied by an important electrostatic activity. These ``basic’’ phenomena have been greatly investigated because of their involvement in many physical problems, natural (solar wind, relativistic jets) or experimental (laser-plasma interaction) : they occurs in plasmas which can be collisional or not, magnetised or not, relativistic or not. One needs to choose a suitable model for their description. The kinetic theory is the most complete and somewhat complex theoretical framework which we will consider. Due to its complexity, it may be interesting to develop reduced models. The first work realised during this thesis is the utilisation of a non-relativistic fluid description, including the dynamics of the pressure tensor, in order to model the linear Weibel-type instabilities. We put in evidence the effect of the non-diagonal components of the tensor on the magnetic field generation. We discuss the ability of the model to reproduce quantitatively or qualitatively the kinetic results by introducing the hydrodynamics limit. The second part of this thesis work is dedicated to the development of the relativistic semi-lagrangian code VLEM, using a domain decomposition scheme : we present the main mathematical tools used in the code, then we deal with the problem of the charge conservation and propose a solution for VLEM, based on an adaptation of the Esirkepov method. Finally, we validate the code through simulations of Weibel-type
Inglebert, Aurélie. "Modèle Vlasov-Maxwell pour l'étude des instabilités de type Weibel". Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0149/document.
Pełny tekst źródłaThe origin of magnetic fields observed in laboratory and astrophysical plasmas is one ofthe most challenging problems in plasma physics. In this respect, the Weibel type instabilities are considered of key importance. These instabilities are caused by a temperature anisotropy (Weibel instability) and electron momentum (current filamentation instability). The main objective of this thesis is the theoretical and numerical study of these instabilities in a collisionless plasma in the relativistic regime. The first aspect of this work is to study the nonlinear regime of these instabilities and the role of kinetic and relativistic effects on the structure of self-consistent electromagnetic fields. In this context, a key problem for the theory and applications, is the identification and analysis of coherent structures developed spontaneously in the nonlinear regime of kinetic scales. A second aspect of the work is the development of analytical and numerical techniques for the study of collisionless plasmas. A mathematical model of reference is the Vlasov-Maxwell model, where the Vlasov equation (mean field theory) is coupled to the Maxwell equations in a self-consistent way. A one-dimensional model, the multi-stream model, is also introduced. Based on a dimensional reduction technique, it is both an analytical model "simple" having the advantage of being able to solve a 1D Vlasov equation for each particle beam, and a numerical model less expensive than a complete model
Betar, Homam. "Kinetic Effects in Magnetic Reconnection". Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0043.
Pełny tekst źródłaPlasmas 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
Boutrouft, Keltoum. "Instabilités thermoconvectives de type Rayleigh-Taylor dans les fluides supercritiques". Phd thesis, Paris, ENSAM, 2006. http://pastel.archives-ouvertes.fr/pastel-00002349.
Pełny tekst źródłaRuyer, Charles. "Kinetic instabilities in plasmas : from electromagnetic fluctuations to collisionless shocks". Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112370/document.
Pełny tekst źródłaCollisionless shocks play a major role in powerful astrophysical objects (e.g., gamma-ray bursts, supernova remnants, pulsar winds, etc.), where they are thought to be responsible for non-thermal particle acceleration and radiation. Numerical simulations have shown that, in the absence of an external magnetic field, these self-organizing structures originate from electromagnetic instabilities triggered by high-velocity colliding flows. These Weibel-like instabilities are indeed capable of producing the magnetic turbulence required for both efficient scattering and Fermi-type acceleration. Along with rapid advances in their theoretical understanding, intense effort is now underway to generate collisionless shocks in the laboratory using energetic lasers. In a first part we study the (w,k)-resolved electromagnetic thermal spectrum sustained by a drifting relativistic plasma. In particular, we obtain analytical formulae for the fluctuation spectra, the latter serving as seeds for growing magnetic modes in counterstreaming plasmas. Distinguishing between subluminal and supraluminal thermal fluctuations, we derived analytical formulae of their respective spectral contributions. Comparisons with particle-in-cell (PIC) simulations are made, showing close agreement in the subluminal regime along with some discrepancy in the supraluminal regime. Our formulae are then used to estimate the saturation time of the Weibel instability of relativistic pair plasmas. Our predictions are shown to match 2-D particle-in-cell (PIC) simulations over a three-decade range in flow energyWe then develop a predictive kinetic model of the nonlinear phase of the Weibel instability induced by two counter-streaming, symmetric and non-relativistic ion beams. This self consistent, fully analytical model allows us to follow the evolution of the beams' properties up to a stage close to complete isotropization and thus to shock formation. Its predictions are supported by 2D and 3D particle-in-cell (PIC) simulations of the ion Weibel instability in uniform geometries, as well as shock-relevant non-uniform configurations. Moreover, they are found in correct agreement with a recent laser-driven plasma collision experiment. Along with this comparison, we pinpoint the important role of electron screening on the ion-Weibel dynamics, which may affect the results of simulations with artificially high electron mass. We subsequently address the shock propagation resulting from the magnetic Weibel turbulence generated in the upstream region. Generalizing the previous symmetric-beam model to the upstream region of the shock, the role of the magnetic turbulence in the shock-front has been analytically and self-consistently characterized. Comparison with simulations validates the model. The interaction of high-energy, ultra-high intensity lasers with dense plasmas is known to produce copious amounts of suprathermal particles. Their acceleration and subsequent transport trigger a variety of Weibel-like electromagnetic instabilities, acting as additional sources of slowing down and scattering. Their understanding is important for the many applications based upon the energy deposition and/or field generation of laser-driven particles. We investigate the ability of relativistic-intensity laser pulses to induce Weibel instability-mediated shocks in overdense plasma targets, as first proposed by Fiuza in 2012. By means of both linear theory and 2D PIC simulations, we demonstrated that in contrast to the standard astrophysical scenario previously addressed, the early-time magnetic fluctuations (Weibel instability) generated by the suprathermal electrons (and not ions) are strong enough to isotropize the target ions and, therefore, induce a collisionless electromagnetic shock
Qiu, Ruihao. "Étude théorique des instabilités de type ferroïques dans des géométries confinées et des réseaux distordus". Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0660/document.
Pełny tekst źródłaIn this thesis, we present a theoretical study of two types of ferroic instabilities: the ferroelectric instability in novel confined geometries and magnetic instabilities controlled by the distortion of the underlying crystal lattice. On the one hand, we consider in detail the ferroelectric instability, specifically, in the nanotubes and the spherical nanoshells and develop a phenomenological theory for describing such an instability. We determine how the emergence of polarization is affected bythe thickness of the nanoparticle, the dielectric properties of the surrounding media and the interfacial boundary conditions. We finnd an intriguing topological finite-size effect that can promote an unexpected competition between two different types of distribution of polarization - irrotational and vortex-like - in the ultra-thin limit. One the other hand, we employ a different formalism to investigate the structural, electronic and magnetic properties of the rare-earth manganites. Specifically,we conduct a theoretical investigation from first-principles calculations. First, we predict a pressure-induced A-AFM insulator to FM metal transition on EuMnO3 under hydrostatic pressure, that is unprecedented in the multiferroic rare-earth manganites RMnO3. This investigation is extended to the study to the epitaxial strain effects on both EuMnO3 and TbMnO3 thin films. We show that epitaxial strain generates a much richer phase diagram compared to hydrostatic pressure. We predict novel magnetically-induced insulator { metal and polar { non-polar transitions. More specifically, we find that both the multiferroic E-AFM order and the polar metallic E*-AFM state are stabilized in TbMnO3 by means of epitaxial strain. In the contrast, we find a novel epitaxial-strain-induced multiferroic E-AFM state in EuMnO3 that cannot be obtained by means of just hydrostatic pressure
Simon, Patrice. "Ferroélectricité, mouvement des protons et instabilités dans les cristaux du type KH₂PO₄ : étude par réflexion infrarouge". Orléans, 1986. http://www.theses.fr/1986ORLE3024.
Pełny tekst źródłaPrioul, Mathieu. "Etude expérimentale des propulseurs de type Hall : processus collisionnels, comportement dynamique, micro-instabilités et phénomènes de transport". Orléans, 2002. http://www.theses.fr/2002ORLE2058.
Pełny tekst źródłaLe, Bourdiec Solène. "Méthodes déterministes de résolution des équations de Vlasov-Maxwell relativistes en vue du calcul de la dynamique des ceintures de Van Allen". Phd thesis, Ecole Centrale Paris, 2007. http://tel.archives-ouvertes.fr/tel-00146258.
Pełny tekst źródłaLe travail de cette thèse a consisté à concevoir un schéma numérique original pour la résolution du système d'équations modélisant ces interactions : les équations de Vlasov-Maxwell relativistes. Notre choix s'est orienté vers des méthodes d'intégration directe. Nous proposons trois nouvelles méthodes spectrales pour discrétiser en impulsion les équations : une méthode de Galerkin et deux méthodes de type collocation. Ces approches sont basées sur des fonctions de Hermite qui ont la particularité de dépendre d'un facteur d'échelle permettant d'obtenir une bonne résolution en vitesse.
Nous présentons dans ce manuscript les calculs conduisant à la discrétisation et à la résolution du problème de Vlasov-Poisson monodimensionnel ainsi que les résultats numériques obtenus. Puis nous étudions les extensions possibles des méthodes au problème complet relativiste. Afin de réduire les temps de calcul, une parallélisation et une optimisation des algorithmes ont été mises en \oe uvre. Enfin, les calculs de validation du code 1Dx-3Dv, à partir d'instabilités de types Weibel et whistlers, à une ou deux espèces d'électrons, sont détaillés.
Egly, Hugues. "Contribution à la modélisation et à la simulation des instabilités de type Rayleigh-Taylor ablatif pour la FCI". Paris 6, 2007. http://www.theses.fr/2007PA066684.
Pełny tekst źródłaThis thesis deals with the dynamics of accelerated ablative front spreading in Inertial Confinement Fusion experiments. ICF is designed for the implosion of a mdeuterium or tritium spherical target. The outer shell, the ablator, is irradiated providing a high level pressure inside the target. During this first stage, the ablation front propagating inward is perturbed by hydrodynamics instabilities, which can prevent the fusion reaction in the decelerated stage. We propose here a study on Rayleigh-Taylor instabilities during ablation process, in the two dimensional case. In order to obtain a numerical solution, we perform an asymptotic analysis in the limit of a high temperature ratio, between the remaining cold ablator and the hot ablated plasma. This study is divided in two steps. First, the thermo-diffusive part of the set of equations is approximated by a Hele-Shaw model, which is then perturbed by the hydrodynamics part. Using a vortex method, we have to solve the advection of a vortical sheet moving with the ablation front. We compute the numerical solution on an eulerian mesh coupled with a front tracking method. The thermal part is calculated by implementing the Fat Boundary Method, recently developped. The hydrodynamic part is obtained from a Finit Volume scheme
Części książek na temat "Instabilités de type Weibel"
Timelli, Giulio. "High-Pressure Die-Cast AlSi9Cu3(Fe) Alloys: Models for Casting Defects and Mechanical Properties". W Encyclopedia of Aluminum and Its Alloys. Boca Raton: CRC Press, 2019. http://dx.doi.org/10.1201/9781351045636-140000278.
Pełny tekst źródłaStreszczenia konferencji na temat "Instabilités de type Weibel"
Satou, Kazuhito, i Toshio Okada. "PIC code simulation and theoretical analysis on generation of Weibel-type instabilities". W Laser interaction and related plasma phenomena: 12th international conference. AIP, 1996. http://dx.doi.org/10.1063/1.50471.
Pełny tekst źródłaHarrison, R. "HUMAN HEPATIC ENDOTHELIAL CELLS AND HEPATOCYTES IN CULTURE: MORPHOLOGICAL FEATURES, AND PRODUCTION OF VON WILLEBRAND FACTOR AND FIBRINOGEN". W XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643350.
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