Instabilité d'une onde d'ionisation dans un plasma excité sur une de ses résonances H.F PDF Download
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Author: Annie Peyre
Publisher:
ISBN:
Category :
Languages : fr
Pages : 34
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Book Description
APRES UN RAPPEL SUR LES ONDES D'IONISATION, ON DECRIT LES CARACTERISTIQUES DU PLASMA DANS LA COLONNE POSITIVE (1) A L'EQUILIBRE; 2) PERTURBEE) D'UN ARC DE XENON A BASSE PRESSION, ET BASSE TENSION. ON CALCULE LE BILAN D'ENERGIE DE LA COLONNE DE PLASMA DANS LAQUELLE SONT EXCITEES DES ONDES BF PAR APPLICATION D'UNE PUISSANCE SUR DEUX RESONANCES RADIALES HF DE LA COLONNE: SOIT LA PREMIERE RESONANCE DIPOLAIRE (OU RESONANCE DIPOLAIRE PRINCIPALE); SOIT LA DEUXIEME RESONANCE DIPOLAIRE (OU PREMIERE RESONANCE TONKS-DATTNER). OBSERVATIONS EXPERIMENTALES SUR L'INSTABILITE DES ONDES D'IONISATION ET DESCRIPTION THEORIQUE AU MOYEN D'UN SYSTEME D'EQUATIONS MACROSCOPIQUES RELATIVES AUX IONS ET AUX ELECTRONS. COMPARAISON DES MECANISMES PHYSIQUES CREANT L'INSTABILITE DES ONDES D'IONISATION A D'AUTRES MECANISMES SUSCEPTIBLES DE CREER DES INSTABILITES BF
Author: Annie Peyre
Publisher:
ISBN:
Category :
Languages : fr
Pages : 34
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Book Description
APRES UN RAPPEL SUR LES ONDES D'IONISATION, ON DECRIT LES CARACTERISTIQUES DU PLASMA DANS LA COLONNE POSITIVE (1) A L'EQUILIBRE; 2) PERTURBEE) D'UN ARC DE XENON A BASSE PRESSION, ET BASSE TENSION. ON CALCULE LE BILAN D'ENERGIE DE LA COLONNE DE PLASMA DANS LAQUELLE SONT EXCITEES DES ONDES BF PAR APPLICATION D'UNE PUISSANCE SUR DEUX RESONANCES RADIALES HF DE LA COLONNE: SOIT LA PREMIERE RESONANCE DIPOLAIRE (OU RESONANCE DIPOLAIRE PRINCIPALE); SOIT LA DEUXIEME RESONANCE DIPOLAIRE (OU PREMIERE RESONANCE TONKS-DATTNER). OBSERVATIONS EXPERIMENTALES SUR L'INSTABILITE DES ONDES D'IONISATION ET DESCRIPTION THEORIQUE AU MOYEN D'UN SYSTEME D'EQUATIONS MACROSCOPIQUES RELATIVES AUX IONS ET AUX ELECTRONS. COMPARAISON DES MECANISMES PHYSIQUES CREANT L'INSTABILITE DES ONDES D'IONISATION A D'AUTRES MECANISMES SUSCEPTIBLES DE CREER DES INSTABILITES BF
Author: Mohamed Chaker
Publisher:
ISBN:
Category :
Languages : fr
Pages : 616
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Book Description
Author: GERARD.. BONHOMME
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Book Description
LES SIMULATIONS NUMERIQUES MONTRENT QUE LA FORMATION DE TOURBILLONS DANS L'ESPACE DES PHASES IONIQUES REPRESENTE LE REGIME NON LINEAIRE DE L'INSTABILITE DU SYSTEME FAISCEAU D'IONS-PLASMA. LA TAILLE ET LE TEMPS CARACTERISTIQUE DE CROISSANCE DE CES TOURBILLONS SONT EN BON ACCORD AVEC LES PREDICTIONS DE LA THEORIE LINEAIRE DE L'INSTABILITE ACOUSTIQUE IONIQUE UNIDIMENSIONNELLE. DES EXPERIENCES, REALISEES DANS UNE MACHINE DOUBLE PLASMA, MONTRENT LA FORMATION D'UNE STRUCTURE DE TYPE BOSSE ET CREUX DERRIERE LE FRONT DE CHOC INDUIT PAR UNE PERTURBATION EN ECHELON DE LA VITESSE DU FAISCEAU. ON PEUT AUSSI Y OBSERVER L'EXCITATION LOCALISEE DE L'INSTABILITE ACOUSTIQUE IONIQUE. DES SIMULATIONS NUMERIQUES, REALISEES POUR DES CHOIX DE PARAMETRES ADAPTES AUX EXPERIENCES, PERMETTENT DE RETROUVER CES OBSERVATIONS. ON ETUDIE ENSUITE LES PROPRIETES DISPERSIVES D'UN PLASMA MAGNETISE DANS LE DOMAINE DES BASSES FREQUENCES. ON CALCULE LE POTENTIEL RAYONNE PAR UNE SOURCE PONCTUELLE AU VOISINAGE DE LA FREQUENCE CYCLOTRON IONIQUE. ON RETROUVE AINSI L'EXISTENCE DE CONES DE RESONANCE, ET LA DISCUSSION DE LEURS PROPRIETES PERMET DE PROPOSER UNE METHODE PRECISE DE DETERMINATION DE LA TEMPERATURE IONIQUE. ENFIN, SONT EXPOSES LES RESULTATS D'UNE ETUDE EXHAUSTIVE DU REGIME LINEAIRE DES INSTABILITES CYCLOTRON IONIQUES DANS UN SYSTEME FAISCEAU D'IONS-PLASMA. L'INFLUENCE DES DIFFERENTS PARAMETRES DU SYSTEME SUR LES COUPLAGES INSTABLES EST DISCUTEE EN DETAIL. LES CONDITIONS D'OBSERVATION DE L'INSTABILITE DANS UNE EXPERIENCE, AINSI QUE DANS LES PLASMAS DE FUSION, SONT CLAIREMENT PRECISEES. LES RESULTATS OBTENUS CONDUISENT EGALEMENT A UNE DISCUSSION DETAILLEE DES EXPERIENCES ANTERIEURES
Author: R. H. Levy
Publisher:
ISBN:
Category : Plasma instabilities
Languages : en
Pages : 55
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Book Description
The addition of a certain fraction of ions to an otherwise stable cloud of electrons can in certain circumstances result in an instability. The case of a low density electron cloud is considered in detail. The condition for onset of the instability is that the unperturbed ion orbits (which characteristically traverse the entire electron cloud) should involve frequencies close to that of the diocotron wave that can propagate on the electron cloud. This condition is equivalent to having the ratio Zme/miq of the order of unity and is independent of the ion density. When instability is present, the growth rate is of the order of the ion plasma frequency. (Author).
Author: Jean-Paul Blaizot
Publisher: Mit Press
ISBN: 9780262022149
Category : Science
Languages : en
Pages : 657
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Book Description
This book provides a comprehensive and pedagogical account of the various methods used in the quantum theory of finite systems, including molecular, atomic, nuclear, and particle phenomena. Covering both background material and advanced topics and including nearly 200 problems, Quantum Theory of Finite Systems has been designed to serve primarily as a text and will also prove useful as a reference in research. The first of the book's four parts introduces the basic mathematical apparatus: second quantization, canonical transformations, Wick theorems and the resulting diagram expansions, and oscillator models. The second part presents mean field approximations and the recently developed path integral methods for the quantization of collective modes. Part three develops perturbation theory in terms of both time-dependent Feynman diagrams and time-independent Goldstone diagrams. A fourth part discusses variational methods based on correlated wavefunctions, including spin correlations. The approximation schemes are formulated for fermions and bosons at eigher zero or non-zero temperature. Although the formalism developed applies to both finite and infinite systems, the book stresses those aspects of the theory that are specific to the description of finite systems. Thus special attention is given to mean field approximations, the ensuing broken symmetries, and the associated collective motions such as rotations. Conversely, some specific features of systems with infinite numbers of degrees of freedom (such as the thermodynamic limit, critical phenomena, and the elimination of ultraviolet divergencies) are deliberately omitted. Jean-Paul Blaizot and Georges Ripka are associated with the Centre d'Etudes Nucleaires de Saclay.
Author: Chevalier François Le
Publisher: Artech House
ISBN: 9781608071357
Category : Radar
Languages : en
Pages : 422
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Book Description
Author: Shuanggen Jin
Publisher: CRC Press
ISBN: 1482214881
Category : Science
Languages : en
Pages : 399
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Book Description
Although lunar exploration began in the 1960s, the moon and other planets have many long-standing, unanswered questions about planetary environments, origin, formation and evolution, magnetization of crustal rocks, internal structure, and possible life. However, with the recent development of planetary geodesy and remote sensing with higher spatial and spectral resolution have come new opportunities to explore and understand the moon and planets in greater detail. Written by well-established, international scientists in the planetary science and remote sensing fields, Planetary Geodesy and Remote Sensing presents the latest methods and techniques of planetary geodesy and remote sensing. The book discusses the latest results in planetary science, including theory, methods, measurements, topography, gravity and magnetic field, atmosphere and ionosphere, geomorphology, volcano, craters, internal structure, and water. The book also highlights comparative studies with the earth in the atmosphere, geomorphology, and interiors of the planets. It discusses future missions and future objectives of planetary exploration and science using the latest advances in remote sensing. With chapters contributed by a stellar list of pioneers and experts, the book provides new insight on the application of new technologies and the observations in planetary geodesy. It is suitable for those working in the field as well as for planetary probe designers, engineers, and planetary geologists and geophysicists.
Author: Alain Reinberg
Publisher: CRC Press
ISBN:
Category : Design
Languages : en
Pages : 268
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Book Description
Periodical and predictable changes in biological susceptibility and response to a large variety of chemical agents, including drugs and food, have been documented since the early 1970s. This book provides a survey of clinically-documented research in chronopharmacology.
Author: Sue Blattes
Publisher: L'Editeur : EDP Sciences
ISBN: 9782868835888
Category : English language
Languages : fr
Pages : 264
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Book Description
Cet ouvrage, devenu célèbre sous son sigle MCSE, a déjà été utilisé par plus de 50 000 étudiants, chercheurs, professionnels. L'objectif est de lire et écrire des textes en anglais scientifique avec facilité et pertinence. L'ouvrage est conçu pour que l'apprenant devienne un véritable utilisateur de l'anglais. La méthode originale repose sur l'analyse des fonctions et structures nécessaires : measurement, frequency, comparison, modification, link words, time, cause and consequence, hypothesis, modality, purpose and process, impersonal forms, compound nouns and adjectives. Dans chaque unit, des tests d'auto-évaluation permettent de se situer et de construire son parcours de formation, d'abord en définissant ses objectifs à l'aide des key points et du lexis, puis, de façon plus personnalisée, en puisant dans les examples in context, checkpoints (back to basics, word web), web search, FAQs... MCSE est l'outil de base d'une méthode qui comprend aussi d'autres outils dans la même collection (Listening Comprehension for Scientiflc English et Speaking Skills in Scientitic English). L'ouvrage est destiné à tout apprenant de niveau baccalauréat qui désire acquérir une réelle compétence dans l'écriture et la lecture de textes en anglais scientifique.
Author: Jacques Lafontaine
Publisher: Springer
ISBN: 3319207350
Category : Mathematics
Languages : en
Pages : 408
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Book Description
This book is an introduction to differential manifolds. It gives solid preliminaries for more advanced topics: Riemannian manifolds, differential topology, Lie theory. It presupposes little background: the reader is only expected to master basic differential calculus, and a little point-set topology. The book covers the main topics of differential geometry: manifolds, tangent space, vector fields, differential forms, Lie groups, and a few more sophisticated topics such as de Rham cohomology, degree theory and the Gauss-Bonnet theorem for surfaces. Its ambition is to give solid foundations. In particular, the introduction of “abstract” notions such as manifolds or differential forms is motivated via questions and examples from mathematics or theoretical physics. More than 150 exercises, some of them easy and classical, some others more sophisticated, will help the beginner as well as the more expert reader. Solutions are provided for most of them. The book should be of interest to various readers: undergraduate and graduate students for a first contact to differential manifolds, mathematicians from other fields and physicists who wish to acquire some feeling about this beautiful theory. The original French text Introduction aux variétés différentielles has been a best-seller in its category in France for many years. Jacques Lafontaine was successively assistant Professor at Paris Diderot University and Professor at the University of Montpellier, where he is presently emeritus. His main research interests are Riemannian and pseudo-Riemannian geometry, including some aspects of mathematical relativity. Besides his personal research articles, he was involved in several textbooks and research monographs.
