Littérature scientifique sur le sujet « Weibel-type instabilities »
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Articles de revues sur le sujet "Weibel-type instabilities"
Lazar, M., R. Schlickeiser, R. Wielebinski et S. Poedts. « COSMOLOGICAL EFFECTS OF WEIBEL-TYPE INSTABILITIES ». Astrophysical Journal 693, no 2 (5 mars 2009) : 1133–41. http://dx.doi.org/10.1088/0004-637x/693/2/1133.
Texte intégralSUGIE, M., K. OGAWA et T. OKADA. « DEVELOPMENT OF ELECTROMAGNETIC WEIBEL-TYPE INSTABILITIES IN ANISOTROPIC PLASMAS ». International Journal of Modern Physics B 21, no 03n04 (10 février 2007) : 637–41. http://dx.doi.org/10.1142/s0217979207042458.
Texte intégralLazar, M., R. Schlickeiser et T. Skoda. « Cosmological magnetic field seeds produced by the Weibel instabilities ». Proceedings of the International Astronomical Union 6, S271 (juin 2010) : 387–88. http://dx.doi.org/10.1017/s1743921311017923.
Texte intégralInglebert, A., A. Ghizzo, T. Reveille, D. Del Sarto, P. Bertrand et F. Califano. « A multi-stream Vlasov modeling unifying relativistic Weibel-type instabilities ». EPL (Europhysics Letters) 95, no 4 (28 juillet 2011) : 45002. http://dx.doi.org/10.1209/0295-5075/95/45002.
Texte intégralLAZAR, M., A. SMOLYAKOV, R. SCHLICKEISER et 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, no 1 (février 2009) : 19–33. http://dx.doi.org/10.1017/s0022377807007015.
Texte intégralSkoutnev, V., A. Hakim, J. Juno et J. M. TenBarge. « Temperature-dependent Saturation of Weibel-type Instabilities in Counter-streaming Plasmas ». Astrophysical Journal 872, no 2 (21 février 2019) : L28. http://dx.doi.org/10.3847/2041-8213/ab0556.
Texte intégralSarrat, M., D. Del Sarto et A. Ghizzo. « Fluid description of Weibel-type instabilities via full pressure tensor dynamics ». EPL (Europhysics Letters) 115, no 4 (1 août 2016) : 45001. http://dx.doi.org/10.1209/0295-5075/115/45001.
Texte intégralSTOCKEM, A., M. LAZAR, P. K. SHUKLA et A. SMOLYAKOV. « A comparative study of the filamentation and Weibel instabilities and their cumulative effect. II. Weakly relativistic beams ». Journal of Plasma Physics 75, no 4 (août 2009) : 529–43. http://dx.doi.org/10.1017/s002237780800768x.
Texte intégralOKADA, T., I. SAJIKI et K. SATOU. « Weibel instability by ultraintense laser pulses ». Laser and Particle Beams 17, no 3 (juillet 1999) : 515–18. http://dx.doi.org/10.1017/s0263034699173191.
Texte intégralInglebert, A., A. Ghizzo, T. Reveille, D. Del Sarto, P. Bertrand et F. Califano. « Multi-stream Vlasov model for the study of relativistic Weibel-type instabilities ». Plasma Physics and Controlled Fusion 54, no 8 (30 mai 2012) : 085004. http://dx.doi.org/10.1088/0741-3335/54/8/085004.
Texte intégralThèses sur le sujet "Weibel-type instabilities"
Sarrat, Mathieu. « Physique des instabilités de type Weibel ». Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0162/document.
Texte intégralWeibel-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
Betar, Homam. « Kinetic Effects in Magnetic Reconnection ». Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0043.
Texte intégralPlasmas 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
Inglebert, Aurélie. « Modèle Vlasov-Maxwell pour l'étude des instabilités de type Weibel ». Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0149/document.
Texte intégralThe 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
Tsai, Hsiang-Ming, et 蔡翔名. « A Preliminary Research on Alternative Lightwave Amplification Using Weibel-type Instabilities ». Thesis, 2011. http://ndltd.ncl.edu.tw/handle/6tszqg.
Texte intégral國立虎尾科技大學
光電與材料科技研究所
99
Even though the field of EM wave amplification for microwaves has been rather mature and enjoying many available technologies, amplifying a lightwave already left the laser resonant cavity can be a tough problem with very little choice. Long before erbium-doped optic fiber amplifier (EDFA) has become a reality and mass produced, other lightwave amplification schemes have been considered, even realized, and tested. Among them, the most noticed are the Stimulated Raman Scattering (SRS) and the Stimulated Brillouin Scattering (SBS). Comparing with the EDFA, a major difference in them both is that in their lightwave amplification mechanisms, no atomic (molecular) energy levels are involved, and only pure plasma physics processes are relevant. However, up to this day, it has been concluded that both the SBS and SRS amplification effects are so much weaker than the gain that stimulated emission provides in a doped-fiber amplifier that Raman and Brillouin amplifiers tend to involve very long distances and very high pump powers. On the other hand, since the EDFA amplification approach is entirely limited by quantum transition physics among energy levels, even though it may at best provide 980 nm and 1490 nm spectrum intervals for communication purposes, overall, it fails to give a real wide-band, flat-top working spectrum. Furthermore, apparently EDFA can only amplify lightwaves guided by optic fibers, not those flying in the open space and of arbitrary wavelengths and amplitudes. Nevertheless, mankind in fact has been longing for a lightwave-enhancing technology that is essentially unrestricted by available atomic energy levels, and at the same time can be applied on lights propagating in free space or within optic fibers. In man-made plasma sources, and in fusion experimental machines (such as the Tokamak), we often witness the working of a plasma instability called Weibel EM instability. However, in these cases, Weibel instability is an undesirable path for system energy loss. In natural environments, Weibel instability also plays a major role in causing gamma ray bursts observed by satellites. Here, we intend to direct the application of Weibel instability to a new direction, viz., amplifying essentially lightwaves of arbitrary wavelengths and amplitudes in either open or fiber-confined space, in a fashion more like the aforementioned SRS and SBS. The approach adopted is using controlled “plasma”, in the form of vertically (with respect to the incident light) oscillating electrons, to trigger the Weibel instability to further cause exponential growth of the incident lightwave amplitude. This current research mainly aims to test the feasibility of such lightwave Weibel amplification theory as a preliminary step toward the ultimate goal of air-borne lightwave amplification.
Actes de conférences sur le sujet "Weibel-type instabilities"
Satou, Kazuhito, et Toshio Okada. « PIC code simulation and theoretical analysis on generation of Weibel-type instabilities ». Dans Laser interaction and related plasma phenomena : 12th international conference. AIP, 1996. http://dx.doi.org/10.1063/1.50471.
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