Download or read book PRODUCTION ET DIAGNOSTIC D UN PLASMA DENSE DE TYPE Z PINCH POUR L INTERACTION AVEC UN FAISCEAU D IONS LOURDS written by VLADIMIR.. ANDRE and published by . This book was released on 1993 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE TRAVAIL A CONSISTE EN LA MISE AU POINT ET AU DIAGNOSTIC D'UN PLASMA DENSE DE TYPE Z-PINCH ADAPTE A DES EXPERIENCES D'INTERACTION ENTRE FAISCEAU D'IONS LOURDS ENERGETIQUES (2 A 4 MEV PAR NUCLEON) ET PLASMA DENSE. DANS UN PREMIER TEMPS, L'ANALYSE DE LA THEORIE DE CETTE INTERACTION PERMET DE DEFINIR LES PROPRIETES IMPOSEES AU PLASMA: DENSITE, IONISATION, PRESSION, STABILITE ET HOMOGENEITE. UNE DECHARGE DE TYPE Z-PINCH EST PARTICULIEREMENT ADAPTEE AUX CONDITIONS REQUISES. UNE ETUDE D'IMAGERIE PAR CAMERA RAPIDE ET A BALAYAGE, ET DES MESURES DU COURANT ET DE TENSION ONT PERMIS DE DEFINIR LES PARAMETRES OPTIMUMS (4KJ POUR 2 MILIBARS DE DEUTERIUM) POUR L'OBTENTION D'UN Z-PINCH HOMOGENE, STABLE ET DE COMPRESSION MAXIMUM. LA COMPARAISON DES DONNEES EXPERIMENTALES AVEC LES MAGNETOHYDRODYNAMIQUES PERMET D'ESTIMER LES PARAMETRES DU PLASMA AU MAXIMUM DE COMPRESSION. LE DIAGNOSTIC DU PLASMA A UTILISE DES METHODES SPECTROSCOPIQUES. IL ETAIT RENDU DELICAT PAR L'ABSENCE DE RAIES DANS LE SPECTRE D'EMISSION PENDANT UNE GRANDE PARTIE DE LA DUREE DE LA DECHARGE. UNE TECHNIQUE ORIGINALE COUPLANT DES MESURES D'ABSORPTION LASER ET DE SPECTROCOPIE DANS LE VISIBLE A ALORS ETE DEVELOPPEE. LES APPROCHES THEORIQUES DES SPECTRES DE DEUTERIUM ALLIEES A L'UTILISATION DES LOIS DE TRANSFERT RADIATIF PERMETTENT DE REMONTER AUX DENSITES ET TEMPERATURES ELECTRONIQUES AVEC PRECISION. UNE BONNE DESCRIPTION DES SPECTRES EXPERIMENTAUX N'A ETE RENDUE POSSIBLE QUE PAR LA PRISE EN COMPTE DE L'INFLUENCE DES MICROCHAMPS ELECTRIQUES INTERNES AU PLASMA SUR LES POIDS STATISTIQUES DES NIVEAUX ATOMIQUES SELON UNE THEORIE ASSEZ RECENTE QUI SE VOIT AINSI VALIDEE. LES RESULTATS DES MODELISATIONS ET DIAGNOSTICS APPORTENT UNE FINE CONNAISSANCE DU Z-PINCH, CE QUI EST FONDAMENTAL POUR LE DEVELOPPEMENT DES EXPERIENCES D'INTERACTION IONS LOURDS-PLASMA
Download or read book INTERACTION D UN FAISCEAU D IONS LOURDS 12 C 4 AVEC UN PLASMA DENSE D HYDROGENE written by Abdallah Sanba and published by . This book was released on 1988 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: ETUDE DE L'INTERACTION D'UN FAISCEAU D'IONS DE CARBONE (**(12)C**(4+) DE 24 MEV) AVEC UN PLASMA D'HYDROGENE CARACTARISE PAR UNE DENSITE DE L'ORDRE DE 10**(17) CM**(-3) ET UNE TEMPERATURE DE 1 A 4 EV. LE PLASMA EST PRODUIT PAR UNE DECHARGE LINEAIRE ET DIFFERENTES METHODES DE DIAGNOSTIC SONT UTILISEES. LE PRINCIPE DE L'EXPERIENCE CONSISTE A PLACER LE PLASMA SUR UNE LIGNE DE L'ACCELERATEUR TANDEM DE L'I.P.N. D'ORSAY ET A MESURER LA PERTE DE VITESSE DES IONS DANS LE PLASMA. LES RESULTATS OBTENUS SONT EN EXCELLENT ACCORD AVEC LA THEORIE, LA PERTE D'ENERGIE DES IONS DANS LE PLASMA EST 2 A 3 FOIS PLUS FORTE QUE DANS LA MATIERE FROIDE DE MEME DENSITE
Download or read book Production and Diagnostic Measurements of a Pulsed High Density Kilovolt Plasma Employing a Noncylindrical Z Pinch written by Carl Boyd Hilland and published by . This book was released on 1970 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book DIAGNOSTIC DE PLASMAS DENSES written by Dunpin Hong and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: CE TRAVAIL A ABORDE L'ETUDE EXPERIMENTALE DES PLASMAS DENSES DESTINES A DES ETUDES FONDAMENTALES ET A DES ETUDES APPLIQUEES AU NIVEAU INDUSTRIEL MAIS AYANT EN COMMUN LEUR MODE DE PRODUCTION ET LEURS METHODES DE DIAGNOSTIC. LES ASPECTS D'INSTRUMENTATION ET DE MISE AU POINT D'OUTILS DE DIAGNOSTIC (METHODES ET LOGICIELS) ONT ETE PRIVILEGIES. DANS LA PREMIERE ETUDE, LE BUT A ETE DE FOURNIR DES DONNEES EXPERIMENTALES SUR L'ELARGISSEMENT STARK DES RAIES DU SOUFRE ET DU FLUOR NEUTRE ET IONISE. CES RAIES ETAIENT EMISES PAR UN PLASMA SIMULANT AU MIEUX UN ARC ELECTRIQUE DE DISJONCTEUR INDUSTRIEL MOYENNE TENSION UTILISANT DU SF#6, TOUT EN CONSERVANT UNE GEOMETRIE ET UNE HOMOGENEITE PERMETTANT DES MESURES PRECISES. LES DONNEES AINSI ETABLIES DANS CE TRAVAIL PERMETTENT UNE INVESTIGATION SIMPLIFIEE DES ARCS DE CETTE CLASSE DE DISJONCTEURS. L'ETUDE SUR L'INTERACTION D'IONS LOURDS A GRANDE ENERGIE AVEC UN PLASMA DENSE A CONSTITUE LE 2EME SUJET, QUI A TRAIT A L'APPROCHE DE LA FUSION THERMONUCLEAIRE PAR CONFINEMENT INERTIEL PAR FAISCEAUX D'IONS LOURDS. CE PROJET AMBITIEUX A POUR BUT, A TERME, DE MAITRISER LE DEPOT D'ENERGIE SUR LES CIBLES DE FUSION INERTIELLE. LES RESULTATS OBTENUS DANS LE CADRE DE CE PROJET ONT PU CONFIRMER LES PREVISIONS THEORIQUES SUR LE POUVOIR D'ARRET D'UN MILIEU IONISE
Download or read book Z pinch Diagnostics Plasma and Liner Instabilities and New X ray Techniques written by and published by . This book was released on 1996 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pulse power experiments of the last several decades have contributed greatly to the understanding of high temperature and high density plasmas and, more recently, to the study of hydrodynamic effects in thick imploding cylinders. Common to all these experiments is the application of a large current pulse to a cylindrically symmetric load, with the resulting Lorenz force compressing the load to produce hydrodynamic motion and/or high temperature, high density plasma. In Los Alamos, Pulsed power experiments are carried out at two facilities. Experiments at low current (from several million to ten million Amperes) are conducted on the Pegasus II capacitor bank. Experiments with higher currents (10's to 100's MA range) are performed in Ancho Canyon with the explosively driven Procyon and MAGO magnetic flux compression generator systems. In this paper, the authors present a survey of diagnostic capabilities and results from several sets of experiments. First, they discuss the initiation and growth of instabilities in plasmas generated from the implosion of hollow z-pinches in the pegasus and Procyon experiments. Next they discuss spectroscopic data from the plasmas produced by the MAGO system. They also show time resolved imaging data from thick ((approximately) .4 mm) liner implosions. Finally, the authors discuss improvements to x-ray and visible light imaging and spectrographic diagnostic techniques. The emphasis of this paper is not so much a detailed discussion of the experiments, but a presentation of imaging and spectroscopic results and the implications of these observations to the experiments.
Download or read book Exploring Plasma Stability and Confinement with High Resolution Density Measurements on the ZaP HD Flow Z Pinch written by Michael Patrick Ross and published by . This book was released on 2016 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ZaP-HD Flow Z-Pinch project provides a platform to explore how shear flow stabilized Z-pinches could scale to high-energy-density plasma (plasma with pressures exceeding 1~Mbar) and fusion reactor conditions. The Z-pinch is a linear plasma confinement geometry in which the plasma carries axial electric current and is confined by its self-induced magnetic field. ZaP-HD generates shear stabilized, axisymmetric Z-pinches with stable lifetimes approaching 60ms. The goal of the project is to increase the plasma density and temperature compared to the previous ZaP project by compressing the plasma to smaller radii (~1mm). Radial and axial plasma electron density structure is measured using digital holographic interferometry (DHI), which provides the necessary fine spatial resolution. ZaP-HD's DHI system uses a 2ns Nd:YAG laser pulse with a second harmonic generator (lambda = 532nm) to produce holograms recorded by a Nikon D3200 digital camera. The holograms are numerically reconstructed with the Fresnel transform reconstruction method to obtain the phase shift caused by the interaction of the laser beam with the plasma. This provides a two-dimensional map of line-integrated electron density, which can be Abel inverted to determine the local number density. The DHI resolves line-integrated densities down to 3 X 1020m−2 with spatial resolution near 10 micro m. This dissertation presents the first application of Fresnel transform reconstruction as an analysis technique for a plasma diagnostic, and it analyzes the method's accuracy through study of synthetic data. It then presents an Abel inversion procedure that utilizes data on both sides of a Z-pinch local number density profile to maximize profile symmetry. Density measurements from DHI reveal the quality of ZaP-HD's confinement, specifically its scaling properties. DHI measurements also enable an evaluation of Z-pinch stability metrics.
Download or read book Optical Probing of Dense Z pinch and Laser Produced Plasmas written by Michael Tatarakis and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Diagnostics in a High Density Z Pinch Plasma written by Brian Kent Hilko and published by . This book was released on 1981 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book INTERACTION D UN FAISCEAU D IONS LOURDS AVEC UN PLASMA CREE PAR UN LASER CO 2 written by Jean-Michel Guihaume and published by . This book was released on 1986 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE CODE NEWHIF A ETE DEVELLOPPE POUR SIMULER NUMERIQUEMENT L'INTERACTION D'UN FAISCEAU D'IONS LOURDS AVEC UN PLASMA. IL PERMET DE CALCULER LA DISTRIBUTION EN CHARGE, EN ENERGIE ET LA REPARTITION SPATIALE D'UN FAISCEAU D'IONS LOURDS, INITIALEMENT MONOENERGETIQUES DE 0,5 A 2 MEV/A ET MONOCHARGES APRES TRAVERSEE D'UN PLASMA. CELUI-CI, CREE PAR UN LASER A CO::(2) EST SUPPOSE CORONAL, DE DENSITE ELECTRONIQUE LINEIQUE COMPRISE ENTRE 10**(16) ET 10**(19) CM**(-2) ET DE TEMPERATURE ELECTRONIQUE MOYENNE COMPRISE ENTRE 100 ET 300 EV
Download or read book Dense Z pinch Plasmas written by and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Early researchers recogniZed the desirable features of the linear Z-pinch configuration as a magnetic fusion scheme. In particular, a Z-pinch reactor might not require auxiliary heating or external field coils, and could constitute an uncomplicated, high plasma .beta. geometry. The simple Z pinch, however, exhibited gross MHD instabilities that disrupted the plasma, and the linear Z pinch was abandoned in favor of more stable configurations. Recent advances in pulsed-power technology and an appreciation of the dynamic behavior of an ohmically heated Z pinch have led to a reexamination of the Z pinch as a workable fusion concept.
Download or read book INTERACTION ENTRE FAISCEAUX D IONS LOURDS ET PLASMAS CHAUDS ET DENSES written by Gilles Maynard and published by . This book was released on 1987 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: ETUDE DE L'EVOLUTION AU COURS DU TEMPS, D'UNE PART DE L'ENERGIE ET DE LA CHARGE D'UN ION LOURD TRAVERSANT UN PLASMA ET D'AUTRE PART, D'UNE CIBLE IRRADIEE PAR FAISCEAUX INTENSES D'IONS LOURDS
Download or read book Diagnostic Development and Plasma material Interaction Studies on the ZaP HD Device written by Eleanor Glynis Forbes and published by . This book was released on 2020 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ZaP-HD Flow Z-Pinch device was designed to investigate the use of a tri-axial electrode configuration to scale a sheared-flow stabilized Z pinch to high energy density conditions. Decoupling the power used to form the plasma from the power used to compress the pinch has resulted in temperatures and densities of 1 keV and 1 x 1018cm−3 during quiescent periods of up to 60 microseconds. After demonstrating improved performance through the use of two power supplies, the ZaP-HD machine has seen further use as a test-bed for diagnostic development and high energy density plasma-material interactions (PMI). Two novel diagnostics have been fielded on the ZaP-HD machine: time-resolved spectroscopy and three-dimensional digital holographic interferometry (DHI). Time-resolved spectroscopy is used to make simultaneous measurements of plasma temperature and velocity over the course of the plasma lifetime. Three-dimensional DHI is used to reconstruct the full 3D electron density structure of approximately three centimeters of the length of the Z-pinch. These two diagnostics used in concert with magnetic field probes and other measurements provide a detailed history of the Z-pinch behavior and give comprehensive information on the variation in pinch performance with initial conditions. A series of experiments were performed to better understand the role of plasma kinetic and thermal energy in material target deformation in high-energy density plasmas. Graphite and boron-nitride targets were exposed to plasmas of varying temperatures and velocities. Plasma behavior was monitored with a diagnostic suite and the targets were examined with high-resolution surface diagnostics to characterize any deformation caused by plasma exposure. Significant differences in the surface structure are seen for graphite targets. Features vary with plasma ion energy and with orientation to the plasma flow. Energy deposition and sputtering yield are calculated for various parameters. Targets exposed to high-energy plasma pulses are found to exceed the BN and graphite sublimation temperature. The data are used to calculate graphite erosion times and may be useful for designing electrodes on future experiments and reactor concepts.
Download or read book ETUDE DE L EMISSION X DANS LES PLASMAS D ALUMINIUM DE TYPE Z PINCH written by RUDOLF.. ROSCH and published by . This book was released on 1999 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE PINCEMENT MAGNETIQUE D'UNE DECHARGE AXIALE, PHENOMENE COURAMMENT QUALIFIE DE Z-PINCH, CONSTITUE UN MOYEN D'OBTENIR UNE SOURCE DE RAYONNEMENT X INTENSE ET BREVE, A PARTIR DU PLASMA CHAUD ET DENSE AINSI CREE. TOUTEFOIS, LE DEVELOPPEMENT D'INSTABILITES RAYLEIGH-TAYLOR LIMITE LE RENDEMENT DE CONVERSION DE L'ENERGIE EN X. LA CONFIGURATION ETUDIEE ICI, VISE A REDUIRE CES INSTABILITES : LE COURANT EST DELIVRE DANS UNE GAINE CYLINDRIQUE DE VAPEUR D'ALUMINIUM (FACILEMENT IONISABLE), COMPRIMEE SUR UN FIL CENTRAL MICROMETRIQUE. LA VAPEUR D'ALUMINIUM (50 G/CM) EST PRODUITE PAR L'EXPLOSION D'UNE FEUILLE DE 3 M D'EPAISSEUR, A PARTIR D'UN BANC DE CONDENSATEURS EXTERNE. LA SIMULATION NUMERIQUE DE L'IMPLOSION DE LA CHARGE A L'AIDE D'UN CODE DE MAGNETOHYDRODYNAMIQUE RADIATIVE PERMET DE DEGAGER LES ORDRES DE GRANDEUR DES PARAMETRES SIGNIFICATIFS (VITESSE DE COMPRESSION, ENERGIE RAYONNEE PAR ZONE SPECTRALE), ET DE RECHERCHER DES CONFIGURATIONS QUI OPTIMISENT LE RENDEMENT X. LES EXPERIENCES, REALISEES SUR LE GENERATEUR HAUTE PUISSANCE PULSEE AMBIORIX (0,5 , 2 TW, 2 MA, 50 NS) COMPRENNENT DE NOMBREUX DIAGNOSTICS : UNE CAMERA A BALAYAGE DE FENTE VISIBLE (PHASE HYDRODYNAMIQUE), DES SPECTROMETRES A HAUTE RESOLUTION (1 EV), POUR EVALUER L'ENERGIE CONTENUE DANS LES RAIES K (PHASE RADIATIVE), UN SYSTEME D'IMAGERIE X, UN ENSEMBLE DE DETECTEURS PHOTOELECTRIQUES ET PHOTOCONDUCTEURS. L'EFFET DU FIL CENTRAL ET DE SA NATURE, SUR LA STABILITE, L'HOMOGENEITE, LA REPRODUCTIBILITE ET LE RENDEMENT X EST ETUDIE. LES CONFIGURATIONS DE JET AL SUR FIL CENTRAL EN AL AMELIORENT D'UN FACTEUR 2, LA QUANTITE D'ENERGIE RAYONNEE DANS LES RAIES K DE L'ALUMINIUM (1,5 KEV OU 7,7 A). L'INTERPRETATION DES RESULTATS, A L'AIDE D'UN MODELE COLLISIONNEL-RADIATIF HORS EQUILIBRE THERMODYNAMIQUE LOCAL, EST EN BON ACCORD AVEC UN PLASMA, COMPOSE D'UN CUR FROID ET DENSE (T#E = 350 EV, N#E = 10#2#0 CM##3), ENTOURE D'UNE COURONNE CHAUDE ET PEU DENSE (T#E = 900 EV, N#E = 10#1#9 CM##3).
Download or read book Fully Kinetic Simulations of Dense Plasma Focus Z Pinch written by and published by . This book was released on 2012 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Low Pressure Plasmas and Microstructuring Technology written by Gerhard Franz and published by Springer Science & Business Media. This book was released on 2009-04-09 with total page 743 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the last forty years, plasma supported processes have attracted ever - creasing interest, and now, all modern semiconductor devices undergo at least one plasma-involved processing step, starting from surface cleaning via coating to etching. In total, the range of the treated substrates covers some orders of magnitude: Trenches and linewidths of commercially available devices have - ready passed the boundary of 100 nm, decorative surface treatment will happen 2 in the mm range, and the upper limit is reached with surface protecting layers of windows which are coated with ?/4 layers against IR radiation. The rapid development of the semiconductor industry is inconceivable wi- outthegiantprogressintheplasmatechnology.Moore’slawisnotcarvedinto 1 stone, and not only the ITRS map is subject to change every ?ve years but also new branches develop and others mingle together. Moreover, the quality of conventional materials can be improved by plasma treatment:Cottonbecomesmorecrease-resistant,leathermoredurable,andthe shrinking of wool ?bers during the washing process can be signi?cantly reduced. To cut a long story short: More than 150 years after the discovery of the sputtering e?ect by Grove, plasma-based processes are about to spread out into new ?elds of research and application [1]—no wonder that the market for etching machines kept growing by an annual rate of 17 % up to the burst of the internet bubble, and it took only some years of recovery to continue the voyage [2].
Download or read book Spectroscopic Investigation of High density Plasmas Produced in a Z pinch written by and published by . This book was released on 1978 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
