Download or read book Amplification de rayonnement XUV dans les plasmas cr es par laser written by Pascale Monier Garbet and published by . This book was released on 1987 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt: ETUDE DE LA FAISABILITE D'UN NOUVEAU SCHEMA D'INVERSION DE POPULATION DANS LE STRONTIUM ISOELECTRONIQUE DU NEON, ASSOCIANT L'EXCITATION COLLISIONNELLE ET L'EXCITATION OPTIQUE QUASI-RESONANTE PAR LE RAYONNEMENT DE L'ALUMINIUM A 6059 A. UNE ANALYSE SPECTROSCOPIQUE DU PLASMA DE STRONTIUM AU VOISINAGE DE 150 A CONDUIT A L'IDENTIFICATION DES RAIES NEONNOIDES SUR LESQUELLES EST ATTENDUE L'AMPLIFICATION DE RAYONNEMENT. L'ABSORPTION X QUASI RESONNANTE DU RAYONNEMENT DE L'ALUMINIUM PAR LE STRONTIUM EST MISE EN EVIDENCE DANS UNE EXPERIENCE A DEUX PLASMAS. UN MODELE RADIATIF, COLLISIONNEL, SPHINX, PERMET DE CALCULER LE GAIN EN FONCTION DES CONDITIONS DE PLASMA ET DU TAUX D'EXCITATION OPTIQUE RESONNANTE

Download or read book AMPLIFICATION DE RAYONNEMENT X UV written by Annie Klisnick and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: UNE PART IMPORTANTE DES TRAVAUX ACTUELS CONSACRES A LA REALISATION D'UN LASER X-UV EXPLOITENT LA RECOMBINAISON DES PLASMAS PRODUITS PAR DES LASERS DE PUISSANCE, AU COURS DE LAQUELLE DES INVERSIONS DE POPULATION PEUVENT APPARAITRE ENTRE LES NIVEAUX EXCITES D'IONS MULTICHARGES. CE TRAVAIL EST CONSACRE A LA MODELISATION NUMERIQUE ET LA MISE EN UVRE EXPERIMENTALE DE CE SCHEMA DE POMPAGE, APPLIQUE AUX IONS ISOELECTRONIQUES DU LITHIUM. A L'AIDE D'UN MODELE COLLISIONNEL RADIATIF ET D'UN CODE HYDRODYNAMIQUE, ON ETUDIE LES CONDITIONS D'APPARITION DES INVERSIONS DE POPULATION ET DU GAIN DANS UN PLASMA D'ALUMINIUM (Z=13). ON MONTRE L'IMPORTANCE PARTICULIERE SUR CES INVERSIONS, DE LA DYNAMIQUE DE RECOMBINAISON DES IONS HELIUMOIDES, AU COURS DU REFROIDISSEMENT RAPIDE DU PLASMA EN EXPANSION. DES TAUX EFFECTIFS SONT CALCULES POUR TENIR COMPTE DE LA CONTRIBUTION DES NIVEAUX EXCITES LITHIUMOIDES DANS CETTE RECOMBINAISON. LA COMPARAISON DES GAINS CALCULES AVEC LES RESULTATS EXPERIMENTAUX MONTRE UN BON ACCORD QUALITATIF. ON PRESENTE UNE ETUDE EXPERIMENTALE EXTENSIVE DE L'AMPLIFICATION DE RAYONNEMENT A 105.7 A (TRANSITION 5F-3D DE L'ION AL10+) DANS DES PLASMAS DE FORME ALLONGEE, DE 1 A 6 CENTIMETRES DE LONGUEUR. L'EFFET D'UN MIROIR MULTICOUCHE SUR LE RAYONNEMENT AMPLIFIE A CETTE LONGUEUR D'ONDE EST MIS EN EVIDENCE. LE PRODUIT GAIN X LONGUEUR MAXIMUM MESURE EST DE 4. POUR LA MEME TRANSITION, ON MESURE UNE AMPLIFICATION A UNE LONGUEUR D'ONDE PLUS COURTE (65.2 A) DANS UN PLASMA DE SOUFRE (Z=16)

Download or read book XUV Laser Amplification in Recombining Laser Produced Plasmas written by G. P. Kiehn and published by . This book was released on 1987 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book XUV Amplification in Recombining Laser Produced Plasmas written by Roland Adam Smith and published by . This book was released on 1989 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Amplification and Gain Measurement of XUV Radiation 42 4 45 and 46 in He like Al Laser Plasma written by K. Muroo and published by . This book was released on 1988 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ETUDE DU LASER A RAYONS X written by JEAN-PIERRE.. RAUCOURT and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: DEUX PROCESSUS D'INVERSION DE POPULATION SONT COURAMMENT EXPLOITES POUR LA REALISATION D'UN LASER X-UV: LE SCHEMA COLLISIONNEL ET LE SCHEMA DE RECOMBINAISON. ILS METTENT TOUS LES DEUX EN JEU DES PLASMAS PRODUITS PAR DES LASERS DE PUISSANCE. CE TRAVAIL COMPORTE L'ETUDE DE CES DEUX MODES D'INVERSION. SUR LE SCHEMA DE RECOMBINAISON, LE ROLE NEGATIF DES NON-UNIFORMITES DU PLASMA DANS L'OBTENTION D'UN GAIN ELEVE A ETE MIS EXPERIMENTALEMENT EN EVIDENCE. DES SIMULATIONS NUMERIQUES DU TRANSFERT RADIATIF ONT ETE MISES EN UVRE POUR ANALYSER CES RESULTATS. DES LAMES DE PHASE ALEATOIRE ONT ETE ESSAYEES POUR LISSER LES NON-UNIFORMITES DU PLASMA ET DES CIBLES DE DIFFERENTES FORMES ONT ETE UTILISEES POUR TENTER D'ACCELERER SON REFROIDISSEMENT. DES GAINS DE 1 A 2 CM ONT ETE MESURES A DES LONGUEURS D'ONDE DE 154, 105 ET 65 ANGSTROMS DANS DES PLASMAS LITHIUMOIDES DE SOUFRE ET D'ALUMINIUM. AVEC LE SCHEMA COLLISIONNEL, L'OBTENTION D'INVERSION DE POPULATION EST PLUS AISEE, MAIS REQUIERT, A MEME LONGUEUR D'ONDE, DES FLUX BEAUCOUP PLUS IMPORTANTS, POUR LA PRODUCTION DE CES PLASMAS. AUSSI, DES INSTALLATIONS DE TRES GRANDE PUISSANCE SONT EN GENERALE NECESSAIRES DANS CE CAS. UN GAIN D'ENVIRON 4 CM A ETE MESURE DANS UN PLASMA D'ARGENT NEONOIDE DE 11 MM DE LONG. ENFIN, UNE EXPERIENCE EFFECTUEE SUR DES IONS DE GERMANIUM NEONOIDE A ABOUTI A L'ELABORATION D'UN LASER A RAYONS X, FONCTIONNANT A UNE LONGUEUR D'ONDE DE 236 ANGSTROMS. UN GAIN DE L'ORDRE DE 4 CM A ETE OBTENU, LE REGIME DE SATURATION A ETE ATTEINT ET UN FORT DEGRE DE COHERENCE A PU ETRE MESURE

Download or read book ABSORPTION POSITIVE ET NEGATIVE DE RAYONNEMENT X UV DANS LES PLASMAS DENSES written by Annie Klisnick and published by . This book was released on 1984 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: CALCUL DU SPECTRE D'ABSORPTION PAR COMPARAISON DES INTENSITES EMISES SELON L'AXE DE DEUX PLASMAS DE FORME CYLINDRIQUE, NE DIFFERANT QUE PAR LEUR LONGUEUR. DANS L'ION LITHIMOIDE D'AL (AL**(10+)) LES CARACTERISTIQUES D'ABSORPTION POUR PLUSIEURS TRANSITIONS CONDUISENT A CONCLURE A UN FORT DESEQUILIBRE DANS LA POPULATION DE CERTAINS NIVEAUX. ON ETUDIE L'INVERSION DE POPULATIONS ENTRE LES NIVEAUX 5F ET 3D, OBSERVEE DANS AL**(10+) MAIS AUSSI MG**(9+). POUR AL**(10+), ON MONTRE COMMENT CETTE INVERSION EST INFLUENCEE PAR LA VARIATION DES PARAMETRES DE PRODUCTION DU PLASMA. L'ETUDE PERMET DE CERNER LES CONDITIONS DANS LESQUELLES CETTE INVERSION PEUT CONDUIRE A UNE AMPLIFICATION DU RAYONNEMENT X-UV.

Download or read book ETUDE DE FACTEURS AFFECTANT L AMPLIFICATION X UV DANS LES IONS LITHIUMOIDES written by MOHAMMED.. GADI and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: L'ETUDE DES INVERSIONS DE POPULATIONS DANS LE DOMAINE X-UV SE PRODUISANTS DANS LES PLASMAS DENSES ET CHAUDS, PRODUITS PAR LA FOCALISATION D'UN LASER SUR UNE CIBLE MASSIVE, A MONTRE QUE LE COEFFICIENT DU GAIN DIMINU LORSQUE LA LONGUEUR DU PLASMA AUGMENTE. CECI NOUS A POUSSE, EN VUE D'UTILISER DES PLASMAS LONGS, A METTRE AU POINT UN NOUVEAU TYPE DE CIBLE DITE A COUCHE MINCE. CE TYPE DE CIBLE EST SUPPOSE EVITER CE PHENOMENE. L'UTILISATION DE CES CIBLES A MONTRE LA VALIDITE DE LA TECHNIQUE DES CIBLES A COUCHE MINCE. AINSI, NOUS AVONS PU OBTENIR UN PREMIER RESULTAT MONTRANT UNE AMPLIFICATION DU RAYONNEMENT DANS LES IONS ALUMINIUM LITHIUMOIDE A 105.7 A AVEC DES CIBLES DE LONGUEUR 6 CM. D'AUTRE PART, EN VUE DE DONNER UNE EXPLICATION A L'ECART ENTRE LES CALCULS ET LES RESULTATS EXPERIMENTAUX CONCERNANT LA LARGEUR DES RAIES ET LA VALEUR DU GAIN, NOUS AVONS ETUDIE L'EFFET DES PHENOMENES D'INSTABILITES DU TYPE KELVIN-HELMHOLTZ QUI ONT LIEU DANS LES PLASMAS PRODUITS PAR LASER, AINSI QUE L'EFFET DE LA FONCTION D'APPAREIL

Download or read book Strong Field Laser Physics written by Thomas Brabec and published by Springer. This book was released on 2008-08-17 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to the rapid progress in laser technology a wealth of novel fundamental and applied applications of lasers in atomic and plasma physics have become possible. This book focuses on the interaction of high intensity lasers with matter. It reviews the state of the art of high power laser sources, intensity laser-atom and laser-plasma interactions, laser matter interaction at relativistic intensities, and QED with intense lasers.

Download or read book The Physics of Free Electron Lasers written by E.L. Saldin and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Free Electron Laser (FEL) will be a crucial tool for research and industrial applications. This book describes the physical fundamentals of FELs on the basis of classical mechanics, electrodynamics, and the kinetic theory of charged particle beams, and will be suitable for graduate students and scientists alike. After a short introduction, the book discusses the theory of the FEL amplifier and oscillator, diffraction effects in the amplifier, and waveguide FEL.

Download or read book Government Reports Annual Index written by and published by . This book was released on 1990 with total page 1312 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synchrotron Radiation and Free Electron Lasers written by Kwang-Je Kim and published by Cambridge University Press. This book was released on 2017-03-23 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: Preliminary concepts -- Synchrotron radiation -- Basic FEL physics -- 1D FEL analysis -- 3D FEL analysis -- Harmonic generation in high-gain FELs -- FEL oscillators and coherent hard X-rays -- Practical considerations and experimental results for high-gain FELs

Download or read book Laser induced Breakdown Spectroscopy LIBS written by Andrzej W. Miziolek and published by . This book was released on 2014-05-14 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first comprehensive reference explaining the fundamentals of the LIBS phenomenon, its history and its fascinating applications across eighteen chapters written by recognized leaders in the field. This book will be of significant interest to researchers in chemical and materials analysis within academia and industry.

Download or read book Laser Processing of Materials written by Peter Schaaf and published by Springer Science & Business Media. This book was released on 2010-07-28 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser materials processing has made tremendous progress and is now at the forefront of industrial and medical applications. The book describes recent advances in smart and nanoscaled materials going well beyond the traditional cutting and welding applications. As no analytical methods are described the examples are really going into the details of what nowadways is possible by employing lasers for sophisticated materials processing giving rise to achievements not possible by conventional materials processing.

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1990-11 with total page 1596 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Attosecond Physics written by Luis Plaja and published by Springer. This book was released on 2013-07-31 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: Attophysics is an emerging field in physics devoted to the study and characterization of matter dynamics in the sub-femtosecond time scale. This book gives coverage of a broad set of selected topics in this field, exciting by their novelty and their potential impact. The book is written review-like. It also includes fundamental chapters as introduction to the field for non-specialist physicists. The book is structured in four sections: basics, attosecond pulse technology, applications to measurements and control of physical processes and future perspectives. It is a valuable reference tool for researchers in the field as well as a concise introduction to non-specialist readers.

Download or read book Encyclopaedia of Historical Metrology Weights and Measures written by Jan Gyllenbok and published by Birkhäuser. This book was released on 2018-04-11 with total page 691 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first of three volumes starts with a short introduction to historical metrology as a scientific discipline and goes on with an anthology of acient and modern measurement systems of all kind, scientific measures, units of time, weights, currencies etc. It concludes with an exhaustive list of references. Units of measurement are of vital importance in every civilization through history. Since the early ages, man has through necessity devised various measures to assist him in everyday life. They have enabled and continue to enable us to trade in commonly and equitably understood amounts, and to investigate, understand, and control the chemical, physical, and biological processes of the natural world. The essence of the work is an alphabetically ordered, comprehensive list of measurement nomenclature, units and scales. It provides an understanding of almost all quantitative expressions observed in all imaginable situations, including spelling variants and the abbreviations and symbols for units, and various acronyms used in metrology. It will be of use not only to historians of science and technology, but also to economic and social historians and should be in every major academic and national library as standard reference work on the topic.