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Artykuły w czasopismach na temat "Plasmas (gaz ionisés) – Recherche"
FAUCHAIS, Pierre. "Gaz ionisés et plasmas". Optique Photonique, lipiec 2000. http://dx.doi.org/10.51257/a-v1-af3560.
Pełny tekst źródłaRozprawy doktorskie na temat "Plasmas (gaz ionisés) – Recherche"
Martz, Christophe. "Spectrométrie ionique dans la magnétosphère et le vent solaire : simulation et précision des mesures coordonnées au moyen des 4 satellites de la mission Cluster". Toulouse 3, 1993. http://www.theses.fr/1993TOU30140.
Pełny tekst źródłaDubois, Thibault. "Electron dynamics in crossed-field discharges". Electronic Thesis or Diss., Orléans, 2023. http://www.theses.fr/2023ORLE1069.
Pełny tekst źródłaCrossed-field plasma discharges have a wide variety of applications, including space propulsion (e.g. Hall thrusters) and materials processing (planar magnetrons). The crossed magnetic and electric field configuration creates features such as plasma turbulence and anisotropies in particle properties, the understanding of which require detailed information on electrons. Direct experimental study of these features would contribute to the development of high-fidelity numerical simulations of such plasmas, and to an improved understanding of their operation. An intense research effort has been devoted in recent years to the study of phenomena such as so-called "anomalous" electron transport across the field lines, which exceeds by several orders of magnitude that expected from collisions. The lack of complete understanding of this phenomenon limits the predictive capability of numerical codes for thrusters and other devices. Recent work has, however, established a link between this transport and high-frequency instabilities within the plasma. The complexity of this behavior (3D propagation, coupling effects) requires not only the development of high-performance, full-dimensional numerical codes, but also advanced diagnostics for electron behavior and properties.The nature of these discharges (such as high degrees of electron magnetization and energy, architecture) render invasive diagnostics such as Langmuir probes limited in their capacity to probe electron features. In this work, two diagnostics based on Thomson scattering were applied to the study of such features: THETIS (incoherent Thomson scattering), for measurement of individual electron properties such as temperature (more broadly, electron energy distribution functions), density and drift velocity, while PRAXIS (coherent Thomson scattering), for measurement of small-scale electron density fluctuations (associated with MHz-frequency waves). In a 1.5 kW Hall-effect thruster, the evolution of electron properties along the radial direction was directly measured. A radial variation in the electron properties, most marked for electron temperature, was observed. A linear kinetic theory model was used to evaluate the form of the dispersion relation corresponding to the measured plasma conditions, and this was compared with previous measurements made using PRAXIS. This analysis revealed a smoothing effect of the dispersion relation which could be accounted for due to the variation of electron properties along the characteristic measurement volume dimensions. In a HiPIMS planar magnetron, several discharge conditions were studied, with argon and helium, for peak currents ranging from 40 A to 600 A. Time-resolved features such as anisotropy of the drift velocity were measured, and an analysis of the contributions to the particle drifts was performed under varying conditions. The linear kinetic theory was adapted to the magnetron. The application of PRAXIS to measurements in the planar magnetron revealed the presence of two instabilities in the HiPIMS mode, one identified as the electron cyclotron drift instability (ECDI), studied in previous work, and the second mode propagating at an angle of 45° to the target surface. A preliminary analysis of the perturbative influence of a simple Langmuir probe in the plasma was also carried out on the planar magnetron, and it was observed that a systematic increase in the instability group velocity was occurred in the presence of such a probe.The application of advanced electron diagnostics to measurements in this work have enabled an improved characterization (including with high temporal resolution) of the electron properties and dynamics of these crossed-field devices
Futatani, Shimpei. "Etude du transport turbulent des impuretés dans les plasmas de tokamak". Aix-Marseille 1, 2009. http://www.theses.fr/2009AIX11056.
Pełny tekst źródłaThe aim of this thesis is to understand impurity transport dynamics in the magnetically confined fusion plasmas. This includes the influence of the turbulent field which induces an anomalous transport in the plasma. Furthermore, this work demonstrates remarkable aspects for impurity transport in two different instabilities: ``ion temperature gradient (ITG) and trapped electron mode (TEM)''. It is shown that in presence of an internal transport barrier (ITB) created by a reversed magnetic shear configuration, one can obtain the reversal of impurity pinch velocity which can change from inward direction to outward direction. This scenario is favourable for expelling impurities from the central region and decontaminating the core plasma. The mechanism of pinch reversal is attributed to a change of direction of the curvature pinch and to a modification of the dominant underlying instability caused by a change of the gradient of the ion temperature which is a consequence of the ITB formation
De, Dominici Gregory. "Understand and predict the power threshold leading to reduced turbulent transport at the edge of tokamak plasma". Electronic Thesis or Diss., Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0320.
Pełny tekst źródłaA model based on a model which natively contained turbulence and turbulence driven flow. It has been improved to include the diamagnetic effects, the magnetic fluctuations, and in this work, we study the parametric dependencies of the observed L-H transition power threshold with respect to the ion mass. By including the diamagnetic effects in our model, we allow the competition between the drift waves and the interchange instabilities. This competition is here studied using fixed gradient simulation. We show in this work that the diamagnetic effects are stabilizing for a resistivity close to experimental conditions. Electromagnetic effects lead to more unstable modes at realistic resistivities. Moreover, a quasilinear estimation of the turbulent flux is able to qualitatively grasp the competition between the drift waves and the interchange and the behaviour of the nonlinear electrostatic turbulent flux with resistivity and plasma beta. Another parametric dependency of the turbulence is studied, by changing the mass of the isotope. This is known as the isotope effect. We show here that the turbulence is reduced when the ion mass is increased. Finally, the characteristic times of the turbulence are studied.Magnetic fluctuations have a dramatic effect on correlation times of the turbulence, by drastically reducing them. Accounting for these results, we present in this work the auto-generation of a transport barrier with electromagnetic simulations of edge turbulence, when the heat power is higher than a threshold, using flux-driven simulations. We have then changed the isotope, and correspondingly to experiments, the power threshold is lower for higher isotope mass
Dubuit, Nicolas. "Transport turbulent d'impuretés dans un plasma magnétisé". Nancy 1, 2006. http://docnum.univ-lorraine.fr/public/SCD_T_2006_0253_DUBUIT.pdf.
Pełny tekst źródłaThe turbulent impurity transport is an essential issue for the achievement of magnetically confined fusion. Indeed, a build-up of impurities in the plasma core induces radiation energy losses. On the other hand, it is foreseen to inject impurities at the plasma edge in order to extract heat by radiation. These conditions impose control and therefore understanding of impurity transport. An analytical expression for the turbulent flux of impurities for a given turbulent spectrum have been derived using a quasilinear theory applied to a drift-wave turbulence. The nature and characteristics of the main accumulation (or pinch) mechanisms for impurities have been identified. A new version of the fluid turbulence code TRB has been developed. This version allows simulating the transport of impurities in electronic and ionic drift-wave turbulence. Zero-flux simulations, corresponding to a stationnary plasma whose impurity source is limited to the plasma edge, confirmed the presence of an impurity pinch. Quasilinear predictions have been numerically confirmed, and the relative importance of the various pinch mechanisms has been studied. The dominant role of curvature pinch has been shown. Finally, simulations have been compared to experimental measurements made on JET and Tore Supra tokamaks. The presence of a turbulent pinch of impurities has been confirmed, as well as the independence of transport on impurity charge
Beaufumé, Pascale. "Transfert énergétique anormal dans les plasmas chauds : couronne solaire et tokamak". Châtenay-Malabry, Ecole centrale de Paris, 1992. http://www.theses.fr/1992ECAP0229.
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 źródłaFaussurier, Gérald. "Traitement statistique des proprietes spectrales des plasmas a l'equilibre thermodynamique local dans le cadre du modele hydrogenique ecrante". Palaiseau, Ecole polytechnique, 1996. http://www.theses.fr/1996EPXX0010.
Pełny tekst źródłaMatte, Jean-Pierre. "Modélisation cinétique de l'intéraction laser-plasma". Palaiseau, Ecole polytechnique, 1987. http://www.theses.fr/1987EPXX0001.
Pełny tekst źródłaSILVESTRE, NICOLAS. "Etude de l'instabilite brillouin stimulee et de l'instabilite modulationnelle dans les experiences d'acceleration de particule par battement de deux ondes laser". Paris 7, 1989. http://www.theses.fr/1989PA077170.
Pełny tekst źródłaKsiążki na temat "Plasmas (gaz ionisés) – Recherche"
Chéron, Bruno. Théorie cinétique, gaz et plasmas. Paris: Ellipses, 2001.
Znajdź pełny tekst źródłaRax, J. M. Physique des plasmas: Cours et applications. Paris: Dunod, 2005.
Znajdź pełny tekst źródłaN, Dnestrovskiĭ I͡U. Numerical simulation of plasmas. Berlin: Springer-Verlag, 1986.
Znajdź pełny tekst źródła1935-, Swanson D. G., i Topical Conference on Radio Frequency Plasma Heating (6th : 1985 : Pine Mountain, Ga.), red. Radiofrequency plasma heating: Sixth topical conference, Callaway Gardens, GA, 1985. New York: American Institute of Physics, 1985.
Znajdź pełny tekst źródłaSpace physics: An introduction to plasmas and particles in the heliosphere and magnetospheres. Wyd. 3. Berlin: Springer, 2004.
Znajdź pełny tekst źródłaKallenrode, May-Britt. Space physics: An introduction to plasmas and particles in the heliosphere and magnetospheres. Wyd. 2. Berlin: Springer, 2001.
Znajdź pełny tekst źródłaSpace physics: An introduction to plasmas and particles in the heliosphere and magnetospheres. Berlin: Springer, 1998.
Znajdź pełny tekst źródłaPrinciples of plasma diagnostics. Cambridge [Cambridgeshire]: Cambridge University Press, 1987.
Znajdź pełny tekst źródłaTopical Conference on Radio Frequency Power in Plasmas (12th 1997 Savannah, Georgia). Radio frequency power in plasmas: 12th Topical Conference, Savannah, GA April 1997. Redaktorzy Ryan Philip M, Intrator Thomas i American Institute of Physics. Woodbury, N.Y: AIP Press, 1997.
Znajdź pełny tekst źródłaV, Kudrin Alexander, i Zaboronkova Tatyana M, red. Electrodynamics of density ducts in magnetized plasmas. Amsterdam: Gordon & Breach, 1999.
Znajdź pełny tekst źródłaCzęści książek na temat "Plasmas (gaz ionisés) – Recherche"
"Chapitre 12 Théorie cinétique des gaz faiblement ionisés". W Physique des plasmas (Vol. II), 287–344. EDP Sciences, 1994. http://dx.doi.org/10.1051/978-2-7598-0286-9.c007.
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