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Studies Of Stimulated Raman Scattering In Laser Plasma Interactions
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Book Synopsis Studies of Stimulated Raman Scattering in Laser Plasma Interactions by :
Download or read book Studies of Stimulated Raman Scattering in Laser Plasma Interactions written by and published by . This book was released on 2002 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coupled theoretical and computational work is presented aimed at understanding and modeling stimulated Raman backscattering (SRBS) relevant to laser-plasma interactions (LPIs) in large-scale, nearly homogeneous plasmas. We address the following five observed, nonlinear phenomena associated with SRBS: coupling of SRBS to Langmuir decay interactions (LDIs); cascading of LDI; SRS cascades; and stimulated electron acoustic wave scattering (SEAS). Keywords: Laser fusion; Laser-plasma interactions; Nonlinear Vlasov simulations; Parametric instabilities; Stimulated Raman scattering.
Book Synopsis Laser-Plasma Interactions by : Dino A. Jaroszynski
Download or read book Laser-Plasma Interactions written by Dino A. Jaroszynski and published by Taylor & Francis. This book was released on 2009-03-27 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents diagnostic methods, experimental techniques, and simulation tools used to study and model laser-plasma interactions. This book discusses the basic theory of the interaction of intense electromagnetic radiation fields with matter.
Book Synopsis Extreme Broadening of Stimulated Raman Scattered Light from High Intensity Laser Plasma Interactions by :
Download or read book Extreme Broadening of Stimulated Raman Scattered Light from High Intensity Laser Plasma Interactions written by and published by . This book was released on 1995 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: High intensity picosecond laser plasma interaction experiments were performed to examine nonlinear scattering mechanisms in field ionized underdense plasmas. Broad and oscillatory spectra were observed for the forward scattered light. The Raman backscattered spectrum showed an extremely broad, supercontinuum like nature, extending from 450 nm to greater than 1200 nm at incident laser intensities of 2 X 10(exp 18) W/sq cm. Narrow and large amplitude modulations in the spectrum of the backscattered radiation were measured and are attributed to scattering from ion waves.
Book Synopsis Investigation of Stimulated Raman Scattering Using Short-pulse Diffraction Limited Laser Beam Near the Instability Threshold by :
Download or read book Investigation of Stimulated Raman Scattering Using Short-pulse Diffraction Limited Laser Beam Near the Instability Threshold written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Short pulse laser plasma interaction experiments using diffraction limited beams provide an excellent platform to investigate the fundamental physics of Stimulated Raman Scattering. Detailed understanding of these laser plasma instabilities impacts the current inertial confinement fusion ignition designs and could potentially impact fast ignition when higher energy lasers are used with longer pulse durations (> 1 kJ and> 1 ps). Using short laser pulses, experiments can be modeled over the entire interaction time of the laser using particle-in-cell codes to validate our understanding quantitatively. Experiments have been conducted at the Trident laser facility and the LULI (Laboratoire pour l'Utilisation des Lasers Intenses) to investigate stimulated Raman scattering near the threshold of the instability using 527 nm and 1059 nm laser light respectively with 1.5-3.0 ps pulses. In both experiments, the interaction beam was focused into a pre-ionized He gas-jet plasma. Measurements of the reflectivity as a function of intensity and k[lambda]{sub D} were completed at the Trident laser facility. At LULI, a 300 fs Thomson scattering probe is used to directly measure the density fluctuations of the driven electron plasma and ion acoustic waves. Work is currently underway comparing the results of the experiments with simulations using the VPIC [K.J. Bowers, et at., Phys. Plasmas, 15 055703 (2008)] particle-in-cell code. Details of the experimental results are presented in this manuscript.
Book Synopsis Laser-Plasma Interactions in High-Energy Density Plasmas by : M. B. Schneider
Download or read book Laser-Plasma Interactions in High-Energy Density Plasmas written by M. B. Schneider and published by . This book was released on 2005 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser-plasma interactions (LPI) have been studied experimentally in high-temperature, high-energy density plasmas. The studies have been performed using the Omega laser at the Laboratory for Laser Energetics (LLE), Rochester, NY. Up to 10 TW of power was incident upon reduced-scale hohlraums, distributed in three laser beam cones. The hot hohlraums fill quickly with plasma. Late in the laser pulse, most of the laser energy is deposited at the laser entrance hole, where most of the LPI takes place. Due to the high electron temperature, the stimulated Raman scattering (SRS) spectrum extends well beyond {omega}{sub 0}/2, due to the Bohm-Gross shift. This high-temperature, high-energy density regime provides a unique opportunity to study LPI beyond inertial confinement fusion (ICF) conditions.
Book Synopsis Recent Laser-plasma Interaction Studies at LLNL. by :
Download or read book Recent Laser-plasma Interaction Studies at LLNL. written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent analysis and modeling of Nova experiments which address our understanding of stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SRS) will be presented. Forward and backward SBS levels have been investigated with SSD of varying bandwidth and with polarization smoothing using an f/8 focusing geometry to emulate NIF conditions. The interpretation of the experiments is aided using F3D, a fluid code which includes modeling of SBS and SRS; a parallel version of F3D is being developed which will allow the modeling of a plasma approaching the size of an entire NIF laser beam. Cryogenic targets have recently been employed to investigate the dependence of SRS saturation levels on ion wave damping via the Langmuir decay instability.
Book Synopsis Investigation of Parametric Instabilities in Femtosecond Laser-Produced Plasmas by : Laszlo Veisz
Download or read book Investigation of Parametric Instabilities in Femtosecond Laser-Produced Plasmas written by Laszlo Veisz and published by . This book was released on 2008-04-01 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser-produced plasmas play an important role in plasma physics and fusion research. Parametric instabilities are the most important processes governing the laser-plasma interaction. Some parametric instabilities as two-plasmon decay or stimulated Raman scattering were investigated in this work using an optical signal, the so called 3/2 harmonics. As this harmonic originates from the plasma its characteristics provide important information about the plasma properties. The angular, spectral and temporal structure of this 3/2 harmonics were studied. Detailed theoretical analysis was made based on a new model to explain the measured results and to gain information about the generation process and the plasma.
Book Synopsis Frontiers in High Energy Density Physics by : National Research Council
Download or read book Frontiers in High Energy Density Physics written by National Research Council and published by National Academies Press. This book was released on 2003-05-11 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent scientific and technical advances have made it possible to create matter in the laboratory under conditions relevant to astrophysical systems such as supernovae and black holes. These advances will also benefit inertial confinement fusion research and the nation's nuclear weapon's program. The report describes the major research facilities on which such high energy density conditions can be achieved and lists a number of key scientific questions about high energy density physics that can be addressed by this research. Several recommendations are presented that would facilitate the development of a comprehensive strategy for realizing these research opportunities.
Book Synopsis Stimulated Raman Scattering Microscopy by : Ji-Xin Cheng
Download or read book Stimulated Raman Scattering Microscopy written by Ji-Xin Cheng and published by Elsevier. This book was released on 2021-12-04 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stimulated Raman Scattering Microscopy: Techniques and Applications describes innovations in instrumentation, data science, chemical probe development, and various applications enabled by a state-of-the-art stimulated Raman scattering (SRS) microscope. Beginning by introducing the history of SRS, this book is composed of seven parts in depth including instrumentation strategies that have pushed the physical limits of SRS microscopy, vibrational probes (which increased the SRS imaging functionality), data science methods, and recent efforts in miniaturization. This rapidly growing field needs a comprehensive resource that brings together the current knowledge on the topic, and this book does just that. Researchers who need to know the requirements for all aspects of the instrumentation as well as the requirements of different imaging applications (such as different types of biological tissue) will benefit enormously from the examples of successful demonstrations of SRS imaging in the book. Led by Editor-in-Chief Ji-Xin Cheng, a pioneer in coherent Raman scattering microscopy, the editorial team has brought together various experts on each aspect of SRS imaging from around the world to provide an authoritative guide to this increasingly important imaging technique. This book is a comprehensive reference for researchers, faculty, postdoctoral researchers, and engineers. Includes every aspect from theoretic reviews of SRS spectroscopy to innovations in instrumentation and current applications of SRS microscopy Provides copious visual elements that illustrate key information, such as SRS images of various biological samples and instrument diagrams and schematics Edited by leading experts of SRS microscopy, with each chapter written by experts in their given topics
Book Synopsis The Role of Kinetic Effects and Wave-wave Interactions in Stimulated Raman Backscattering in Long-scale Plasmas by :
Download or read book The Role of Kinetic Effects and Wave-wave Interactions in Stimulated Raman Backscattering in Long-scale Plasmas written by and published by . This book was released on 2001 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser-plasma instability (LPI) research at Los Alamos is done as a closely coupled theoretical and experimental scientific program to advance the ignition and weapons physics enterprises, which are integrated by the US Department of Energy as a national program. Past LANL experiments, performed as part of the Nova Technical Contract, on hohlraum plasmas approaching NIF conditions have raised two main questions regarding stimulated Raman back-scattering (SRS) in such plasmas: (1) How can the high observed values of SRS reflectivity persist at k;l, = 0.3 -- 0.45? (2) What are the non-linear mechanism(s) whereby SRS saturates? In this paper we address those two questions with results from experiments on the LANL, Trident laser, and from Vlasov and PIC modeling of relevant plasmas, all aimed at understanding the physics involved. We find that non-Maxwellian distributions driven by intense ohmic heating, as well as electron trapping by the daughter SRS plasma wave, are implicated in the high SRS reflectivities observed at high values of Id, . We also find that electron trapping and the secondary Langmuir Decay Instability are important ingredients in the non-linear evolution of SRS.
Book Synopsis Development and Use of a Ray-based Analysis Tool for the Investigation of Stimulated Raman Scattering in Laser-plasma Interaction Experiments by : Steven Hironaka
Download or read book Development and Use of a Ray-based Analysis Tool for the Investigation of Stimulated Raman Scattering in Laser-plasma Interaction Experiments written by Steven Hironaka and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent long-scale-length spherical target experiments, performed on the OMEGA EP laser, are analyzed for stimulated Raman side-scattering (SRSS). This work has been motivated by results obtained on experiments performed at the Nation Ignition Facility (NIF), relevant to directly-driven inertial confinement fusion (ICF). These NIF experiments have shown SRSS to be an important process, possibly responsible for the observed hot electron generation. Our model, based on ray tracing, is able to explain the time-dependent scattered light spectra from the OMEGA EP experiments: It identifies SRS side-scatter and near backscatter from portions of each incident beam where the scattered electromagnetic wave is generated in the direction parallel to contours of constant density. The nature of SRSS instability (temporal versus spatial growth) is discussed. It is suggested that the OMEGA EP platform could provide a good surrogate in which to develop SRSS mitigation strategies.
Book Synopsis Study of Laser Plasma Interactions Using an Eulerian Vlasov Code by : David J. Strozzi
Download or read book Study of Laser Plasma Interactions Using an Eulerian Vlasov Code written by David J. Strozzi and published by . This book was released on 2004 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a one-dimensional Eulerian Vlasov code for performing kinetic simulations of laser-plasma interactions. We use the code to study parametric instabilities, in particular stimulated Raman scattering. For conditions similar to those of single-hot-spot experiments, we find that kinetic effects are important in the saturation of this instability. Work is underway to make the code to 1 1/2 and 2D (resolving y and py) and parallelize it.
Book Synopsis Studies of Stimulated Raman Scattering in Plasmas by : Robert Rankin
Download or read book Studies of Stimulated Raman Scattering in Plasmas written by Robert Rankin and published by . This book was released on 1983 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Characterization of High-Temperature Laser-Produced Plasmas Using Thomson Scattering by : S. Ross
Download or read book Characterization of High-Temperature Laser-Produced Plasmas Using Thomson Scattering written by S. Ross and published by . This book was released on 2005 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultraviolet Thomson scattering has been fielded at the Omega Laser Facility to achieve accurate measurements of the plasma conditions in laser-produced high-temperature plasmas. Recent applications to hohlraum targets that have been filled with CH gas or SiO{sub 2} foams have demonstrated a new high temperature plasma regime of importance to laser-plasma interaction studies in a strongly damped regime such as those occurring in indirect drive inertial confinement fusion experiments. The Thomson scattering spectra show the collective ion acoustic features that fit the theory for two ion species plasmas and from which we infer the electron and ion temperature. We find that the electron temperature scales from 2-4 keV when increasing the heater beam energy into the hohlraum from 8-17 kJ, respectively. Simultaneous measurements of the stimulated Raman scattering from a green 527 nm interaction beam show that the reflectivity decreases from 20% to 1% indicating that this instability is strongly damped at high temperatures. These findings support green laser beams as possible driver option for laser-driven fusion experiments.
Book Synopsis The Physics Of Laser Plasma Interactions by : William Kruer
Download or read book The Physics Of Laser Plasma Interactions written by William Kruer and published by CRC Press. This book was released on 2019-08-20 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the physics of laser plasma interactions and presents a complementary and very useful numerical model of plasmas. It describes the linear theory of light wave propagation in plasmas, including linear mode conversion into plasma waves and collisional damping.
Book Synopsis Theoretical Studies of Some Nonlinear Laser-plasma Interactions by :
Download or read book Theoretical Studies of Some Nonlinear Laser-plasma Interactions written by and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The nonlinear coupling of intense, monochromatic, electromagnetic radiation with plasma is considered in a number of special cases. The first part of the thesis serves as an introduction to three-wave interactions. A general formulation of the stimulated scattering of transverse waves by longitudinal modes in a warm, unmagnetized, uniform plasma is constructed. A general dispersion relation is derived that describes Raman and Brillouin scattering, modulational instability, and induced Thomson scattering. Raman scattering (the scattering of a photon into another photon and an electron plasma wave) is investigated as a possible plasma heating scheme. Analytic theory complemented by computer simulation is presented describing the nonlinear mode coupling of laser light with small and large amplitude, resonantly excited electron plasma waves. The simulated scattering of a coherent electromagnetic wave by low frequency density perturbations in homogeneous plasma is discussed. A composite picture of the linear dispersion relations for filamentation and Brillouin scattering is constructed. The absolute instability of Brillouin weak and strong coupling by analytic and numerical means is described. (auth).
Book Synopsis Laser Thermonuclear Fusion : Research Review, (1984-2008), on Generation of Suprathermal Particles, Laser Radiation Harmonics, and Quasistationary Magnetic Fields. (The Stefan University Graduate Courses,ISSN: 1543-558X) by : V.Alexander STEFAN
Download or read book Laser Thermonuclear Fusion : Research Review, (1984-2008), on Generation of Suprathermal Particles, Laser Radiation Harmonics, and Quasistationary Magnetic Fields. (The Stefan University Graduate Courses,ISSN: 1543-558X) written by V.Alexander STEFAN and published by Stefan University Press. This book was released on with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt:
