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Thomson Scattering Techniques In Laser Produced Plasmas
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Book Synopsis Thomson Scattering Techniques in Laser Produced Plasmas by : J. S. Ross
Download or read book Thomson Scattering Techniques in Laser Produced Plasmas written by J. S. Ross and published by . This book was released on 2006 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thomson scattering has been shown to be a valuable technique for measuring the plasma conditions in laser produced plasmas. Measurement techniques are discussed that use the ion-acoustic frequency measured from the collective Thomson-scattering spectrum to extract the electron temperature, ion temperature, plasma flow, and electron density in a laser produced plasma. In a recent study, they demonstrated a novel Thomson-scattering technique to measure the dispersion of ion-acoustic fluctuations that employing multiple color Thomson-scattering diagnostics. They obtained frequency-resolved Thomson-scattering spectra of the two separate thermal ion-acoustic fluctuations with significantly different wave vectors. This new technique allows a simultaneous time resolved local measurement of electron density and temperature. The plasma fluctuations are shown to become dispersive with increasing electron temperature. Furthermore, a Thomson-scattering technique to measure the electron temperature profile is presented where recent experiments have measured a large electron temperature gradient (Te = 1.4 keV to Te = 3.2 keV over 1.5-mm) along the axis of a 2-mm long hohlraum when heated asymmetrically.
Book Synopsis Plasma Scattering of Electromagnetic Radiation by : John Sheffield
Download or read book Plasma Scattering of Electromagnetic Radiation written by John Sheffield and published by Academic Press. This book was released on 2010-11-25 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents one of the most powerful methods of plasma diagnosis in exquisite detail, to guide researchers in the theory and measurement techniques of light scattering in plasmas. Light scattering in plasmas is essential in the research and development of fusion energy, environmental solutions, and electronics. Referred to as the "Bible" by researchers, the work encompasses fusion and industrial applications essential in plasma research. It is the only comprehensive resource specific to the plasma scattering technique. It provides a wide-range of experimental examples and discussion of their principles with worked examples to assist researchers in applying the theory. Computing techniques for solving basic equations helps researchers compare data to the actual experiment New material on advances on the experimental side, such as the application of high density plasmas of inertial fusion Worked out examples of the scattering technique for easier comprehension of theory
Book Synopsis Investigation of Thomson Scattering from the Free Electrons in a Plasma by : Edward Rolfe
Download or read book Investigation of Thomson Scattering from the Free Electrons in a Plasma written by Edward Rolfe and published by . This book was released on 1966 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: A plasma diagnostic technique is presented which utilizes the Thomson scattering of a laser beam from free electrons. By this means a measurement may be made of both electron concentration and temperature. An extensive analysis of background radiation (noise) is given, and of the photoionization effects of the laser beam. Details of a plasma source which continuously simulates conditions in a reentry plasma, of a giant pulse laser, and of detection apparatus are described. By taking advantage of the broad Doppler spectrum of the Thomson-scattered light, measurements of the spectral wings to the exclusion of the laser wavelength permits the elimination of background radiation to a substantial degree. The investigation is specialized to conditions encountered in reentry plasmas, but would be applicable to measurements in rocket exhausts and explosion generated plasmas. (Author).
Book Synopsis Thomson Scattering Measurements of Heat Flow in a Laser Produced Plasma by : James Alan Hawreliak
Download or read book Thomson Scattering Measurements of Heat Flow in a Laser Produced Plasma written by James Alan Hawreliak and published by . This book was released on 2004 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Direct Measurements of Nonlocal Heat Flux in Laser-produced Coronal Plasmas Using Thomson Scattering from Electron-plasma Waves by : Robert James Henchen
Download or read book Direct Measurements of Nonlocal Heat Flux in Laser-produced Coronal Plasmas Using Thomson Scattering from Electron-plasma Waves written by Robert James Henchen and published by . This book was released on 2018 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Thermal transport is a fundamental process in plasma physics that is not well understood. Historically, local models have been used to describe the heat flux in plasmas but artificially limit the flux at even modest temperature gradients. This Thesis studies electron thermal transport in laser-produced coronal plasmas using a novel Thomson scattering technique. Thomson scattering is sensitive to changes in the electron distribution function caused by heat flux. The experiments show that nonlocal effects must be included in regions where the plasma was not collisional enough for classical theory to be valid. Vlasov-Fokker-Planck simulations self consistently calculated the electron distribution functions used to reproduce the measured Thomson scattering spectra and to determine the heat flux. Measured heat flux values were up to 40% smaller than classical values inferred from the measured plasma conditions in this region. This is the first direct measurement of nonlocal heat flux in plasmas. In the opposite limit, classical theory matched the observed Thomson scattering data. Multigroup nonlocal simulations overestimated the measured heat flux."--Page xi.
Book Synopsis Characterization of Laser-produced Fusion Plasmas with Thomson Scattering by :
Download or read book Characterization of Laser-produced Fusion Plasmas with Thomson Scattering written by and published by . This book was released on 1997 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thomson scattering has been developed at the Nova laser facility as a direct and accurate diagnostic to characterize inertial confinement fusion plasmas. Measurements from methane-filled, ignition relevant hohlraums apply the theory for two ion species plasmas, which has been tested in separate open geometry experiments, to obtain electron and ion temperatures. The experimental data provide a benchmark for two-dimensional hydrodynamic simulations using LASNEX, which is presently in use to predict he performance of future megajoule laser- driven hohlraums of the National Ignition Facility (NIF). The data are consistent with modeling using significantly inhibited heat transport at the peak of the drive. Furthermore, we find that stagnating plasma regions on the hohlraum axis are well described by the calculations. The result implies that stagnation in gas-filled hohlraums occurs too late to directly affect the capsule implosion in ignition experiments.
Book Synopsis Thomson Scattering in the Corona of Laser-produced Gold Plasmas by :
Download or read book Thomson Scattering in the Corona of Laser-produced Gold Plasmas written by and published by . This book was released on 1996 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thomson scattering measurements of the electron temperature in laser- produced gold plasmas are presented. We irradiated a flat gold disk target with one laser beam of the Nova laser facility. A second laser beam probed the plasma at a distance of 500[mu]m with temporally resolved Thomson scattering. The electron temperature measurements are compared with hydrodynamic simulations using the code LASNEX for experiments applying smoothed and unsmoothed heater beams. In case of an unsmoothed heater beam the simulations predict temperatures which are about 40% higher than our measured data. Although the agreement is improved for a smoothed heater beam, discrepancies exist in the decay phase of the plasma. We discuss possible explanations for these observations.
Book Synopsis Picosecond Thomson-scattering Spectroscopy Investigation of Thermodynamics in Laser-plasma Amplifiers by : Andrew S. Davies
Download or read book Picosecond Thomson-scattering Spectroscopy Investigation of Thermodynamics in Laser-plasma Amplifiers written by Andrew S. Davies and published by . This book was released on 2019 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Ultrafast electron plasma wave dynamics, Thermodynamics, and collisions are fundamental processes in laser-plasma physics that is not well understood. Historically, models have used simple approximations to describe the Thermodynamics in laser-plasma devices or artificially assumed constant plasma conditions. This thesis studies the picosecond ionization and Thermodynamics in laser-produced underdense plasmas using a novel Thomson scattering technique. The unprecedented temporal resolution of the Thomson spectra provided a measurement of collisional electron plasma waves that were modeled to extract the picosecond evolution of the electron temperature and density. This revealed a transition in the plasma-wave dynamics from an initially cold, collisional state to a quasi-stationary, collisionless state. The Thomson-scattering spectra were compared with theoretical calculations of the fluctuation spectrum using either a conventional Bhatnagar Gross Krook (BGK) collision operator or the rigorous Landau collision terms: the BGK model overestimates the electron temperature by 50% in the most-collisional conditions. These picosecond electron temperature and density measurements can be applied to laser-plasma devices that require knowledge of the rapidly evolving plasma conditions, such as a Raman plasma amplifier. These results indicate that the rapidly evolving conditions would result in a strong detuning that would limit the performance of laser-plasma amplifiers"--Page xii.
Book Synopsis Nonlinear Thomson Scattering of Intense Laser Pulse from Beams and Plasmas by :
Download or read book Nonlinear Thomson Scattering of Intense Laser Pulse from Beams and Plasmas written by and published by . This book was released on 1993 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Comprehensive theory is developed to describe the nonlinear Thomson scattering of intense laser fields from beams and plasmas. This theory is valid for linearly or circularly polarized incident laser fields of arbitrary intensities and for electrons of arbitrary energies. Explicit expressions for the intensity distributions of the scattered radiation are calculated and numerically evaluated. The space-charge electrostatic potential, which is important in high density plasmas and prevents the axial drift of electrons, is included self-consistently. Various properties of the scattered radiation are examined, including the linewidth, angular distribution, and the behavior of the radiation spectra at ultrahigh intensities. Non-ideal effects, such as electron energy spread and beam emittance, are discussed. A laser synchrotron source (LSS), based on nonlinear Thomson scattering, may provide a practical method for generating tunable, near monochromatic, well collimated, short pulse x-rays in a compact, relatively inexpensive source. Two examples of possible LSS configurations are presented: an electron beam LSS generating hard (30 keV, 0.4 A) x-rays and a plasma LSS generating soft (0.3 keV, 40 A) x-rays. These LSS configurations are capable of generating ultrashort (approx. 1 ps) x-ray pulses with high peak flux (> 10(21) photons/s) and brightness (> 10(19) photons/s-mm2- mrad (2) 0.1% BW). Synchrotron radiation, Thomson scattering, Laser-plasma interactions.
Book Synopsis Detailed Characterization of Plasma Wave Behavior Using Collective Thomson Scattering by :
Download or read book Detailed Characterization of Plasma Wave Behavior Using Collective Thomson Scattering written by and published by . This book was released on 2004 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: Collective Thomson scattering is widely used to measure bulk plasma parameters in high density, laser-produced plasmas, and is used to detect plasma waves from instabilities. However, inhomogeneity in these small plasmas often leads to a spectrum with insufficient resolution to discern phenomena such as wave damping and nonlinear wave effects. Two techniques are discussed for laser-produced plasmas to overcome these limitations, and provide details of wave damping and nonlinear behavior. First, imaging Thomson scattering is used to obtain spatially-resolved plasma wave profiles in a 100-200 eV plasma, and allows us to infer ion-ion collisional damping rates. Second, a diffraction-limited laser beam is used to drive stimulated Raman scattering (SRS) in a hot plasma, generating large amplitude Langmuir waves. The comparatively small interaction volume permits sufficient spectral resolution to observe nonlinear wave behavior, previously unresolved in other experiments.
Book Synopsis Electrical Probes for Plasma Diagnostics by : John Douglas Swift
Download or read book Electrical Probes for Plasma Diagnostics written by John Douglas Swift and published by Iliffe. This book was released on 1969 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Insight On Multifractal Dynamics Of Ns-laser Produced Plasmas by : Stefan Andrei Irimiciuc
Download or read book Insight On Multifractal Dynamics Of Ns-laser Produced Plasmas written by Stefan Andrei Irimiciuc and published by World Scientific. This book was released on 2023-08-22 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fourteen years after the first proposal of a fractal theoretical model to understand the dynamics of laser produced plasma, a complete image of the model is projected on a wide range of empirical data related to laser produced plasmas.The book tackles the two sides of laser produced plasmas with experimental data on a wide range of materials, from metallic alloys to geological samples and the associated mathematical model is developed in the multifractal theory of motion. A new perspective is explored in analyzing and interpreting the data collected by electrical or optical methods, focusing especially on the charged particles dynamics and the nature of fractal fluctuations and their influence during measurements as well as to the scattering process and plasma splitting phenomena, all seen through the lens of multifractal physics.The book offers the best presentation of the multifractal theoretical model for the study of transient phenomena in laser produced plasmas, which focus leads to a balanced development of the model showcasing both the flexibility and the unique vision of a multifractal mathematical apparatus.
Book Synopsis 90 Degree Laser Light Scattering from a Low Density Plasma by : Terrence Francis Alger
Download or read book 90 Degree Laser Light Scattering from a Low Density Plasma written by Terrence Francis Alger and published by . This book was released on 1970 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: The experiment was conducted to learn experimental techniques for studying Thomson Scattering at an angle of 90 degrees from a laboratory plasma. A successful method of canceling the plasma radiation was employed by using a Calcite Slab to separate the plasma radiation into two equal intensity beams which self canceled when put through a differential amplifier. Scattered light from the plasma was not observed due to the noise level of the photomultipliers and the reflections from the plasma chamber. (Author).
Book Synopsis Lasers-Induced Plasmas and Applications by : Radziemski
Download or read book Lasers-Induced Plasmas and Applications written by Radziemski and published by CRC Press. This book was released on 2020-09-10 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses the physics of plasma initiation and reviews the features of dissipating, propagating plasmas. It deals with advances in diagnostics for high-energy, laser-fusion plasmas. The book reviews the basic physical processes, plasma characteristics of the "continuous optical discharge".
Book Synopsis Laser-Aided Diagnostics of Plasmas and Gases by : K Muraoka
Download or read book Laser-Aided Diagnostics of Plasmas and Gases written by K Muraoka and published by CRC Press. This book was released on 2016-04-19 with total page 307 pages. Available in PDF, EPUB and Kindle. Book excerpt: Updated and expanded from the original Japanese edition, Laser-Aided Diagnostics of Gases and Plasmas takes a unique approach in treating laser-aided diagnostics. The book unifies the subject by joining applications instead of describing each application as a totally separate system. In taking this approach, it highlights the relative strengths of
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976 with total page 1288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laser-Plasma Interactions by : Dino A. Jaroszynski
Download or read book Laser-Plasma Interactions written by Dino A. Jaroszynski and published by CRC Press. This book was released on 2009 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: Collecting contributions from a host of international experts, this compendium presents novel diagnostic methods, experimental techniques, and simulation tools used to study and model laser-plasma interactions. After discussing the basic theory of the interaction of intense electromagnetic radiation fields with matter, it covers three applications of intense fields in plasma: inertial fusion, wakefield accelerators, and advanced radiation sources. The text also examines the underlying phenomena that link certain applications together. With a focus on current research trends, this book guides readers to the brink of the most stimulating challenges in the field.
