Thomson Scattering as a Source of X-radiation Using the DOE/EG&G/EM Linac PDF Download
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Author: C. R. Sawyer
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Languages : en
Pages : 24
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Author: C. R. Sawyer
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
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Author: Marco Endrizzi
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Category :
Languages : en
Pages :
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![Demonstration of Successful X-ray Thomson Scattering Using Picosecond K-[alpha] X-ray Sources for the Characterization of Dense Heated Matter PDF](https://books.google.com/books/content/images/frontcover/NcpLAQAACAAJ?fife=w80-h100)
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Languages : en
Pages : 5
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We discuss the first successful K-[alpha] x-ray Thomson scattering experiment from solid density plasmas for use as a diagnostic in determining the temperature, density, and ionization state of warm dense matter with picosecond resolution. The development of this source as a diagnostic and stringent requirements for successful K-[alpha] x-ray Thomson scattering are addressed. Data for the experimental techniques described in this paper [1] suggest the capability of single shot characterization of warm dense matter and the ability to use this scattering source at future Free Electron Lasers (FEL) where comparable scattering signal levels are predicted.
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Languages : en
Pages : 7
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The experiment in this work was preformed at the Titan laser facility (S1) where a short pulse beam at a wavelength of 1053nm delivered up to 350J in 0.5 to 20 ps and a long pulse beam at 527nm, 2[omega] frequency provided energies up to 450J in 1 to 6 ns. Long pulse shaping in this experiment, similar to future capabilities at NIF, was primarily a 4ns long foot with an intensity of 1 x 1013 W/cm2, followed by a 2ns long peak with an intensity of 3 x 1013 W/cm2. A ≈ 600 um phase plate was used on the long pulse beam to moderate non-uniformities in the intensity profile. An illustration of the Thomson scattering setup for this experiment is provided in Fig. 1 of the main text. A nearly mono-energetic scattering source of [Delta]E/E ≈ 0.3% in the 4.5 keV Ti K-alpha line was produced via intense short-pulse laser irradiation of 1.9 x 3 x 0.01 mm Ti foils, creating energetic keV electrons in the process (S2, S3). The nearly isotropic source emission (S4) is produced in the cold solid density bulk of the foil from electron K shell ionization of neutral or weakly ionized atoms, with an emission size on the order of the laser focal spot. By optimizing the laser intensity and pulse width to 4.4 x 1016 W cm−2, a total of 2.3 x 1013 x-ray photons have been produced into 4[pi]. This value corresponds to a conversion efficiency of laser energy into Ti K-alpha x-ray energy of 5 x 10−5, see Fig. S1. These sources provide ≈10 ps x-ray pulses as measured experimentally (S5).
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Languages : en
Pages : 4
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Advances in the development of laser-produced x-ray sources have enabled a new class of high-energy density physics experiments. Powerful narrow-bandwidth x rays penetrate through short-lived hot dense states of matter and probe the physical properties with spectrally resolved x-ray scattering. Experiments from isochorically-heated plasmas with electron densities in the range of solid density and above have been demonstrated allowing for the first time exploration of the microscopic properties of dense matter regime close to strongly-coupled and Fermi degenerate conditions. Backscatter measurements have accessed the non-collective Compton scattering regime, which provides accurate diagnostic information on the temperature, density and ionization states. The forward scattering spectrum has been shown to measure the collective plasmon oscillations. Besides extracting the standard plasma parameters, density and temperature, forward scattering yields new observables such as a direct measure of collisions, quantum effects and detailed balance. In this talk, we will discuss new results important for applications of this technique for novel experiments in a wide range of research areas such as inertial confinement fusion, radiation-hydrodynamics, material science, and laboratory astrophysics.
Author: G. Materlik
Publisher: North Holland
ISBN:
Category : Medical
Languages : en
Pages : 698
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Hardbound. The collected articles in this book written by recognized experts in the field explore the theoretical and experimental insights and applications of the rapidly expanding science of x-ray resonant interactions. The variety of papers presented reflects the theoretical and experimental progress made possible with tunable, polarized and highly brilliant synchrotron radiation sources. In a rapidly changing field this book provides a single selected reference source on the present understanding of x-ray resonance scattering and its many applications. A detailed subject index provides easy access to the many topics covered by the authors who list over 1000 references.
Author: Kathrin Wünsch
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Languages : en
Pages : 0
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Languages : en
Pages : 11
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Collective x-ray Thomson scattering allows measuring plasmons, i.e electron plasma oscillations (Langmuir waves). This is manifest in the appearance of spectrally up- and down-shifted spectral features in addition to the Rayleigh signal. The ratio of the up- and down-shifted signals is directly related to detailed balance, allowing to determine the plasma temperature from first principles. The spectral shift of the plasmon signals is sensitive to temperature and electron density. We discuss the experimental considerations that have to be fulfilled to observe plasmon signals with x-ray Thomson scattering. As an example, we describe an experiment that used the Cl Ly-[alpha] x-ray line at 2.96 keV to measure collective Thomson scattering from solid beryllium, isochorically heated to 18 eV. Since temperature measurement based on detailed balance is based on first principles, this method is important to validate models that, for example, calculate the static ion-ion structure factor S{sub ii}(k).
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Category :
Languages : en
Pages : 27
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We propose a collective Thomson scattering experiment at the VUV free electron laser facility at DESY (FLASH) which aims to diagnose warm dense matter at near-solid density. The plasma region of interest marks the transition from an ideal plasma to a correlated and degenerate many-particle system and is of current interest, e.g. in ICF experiments or laboratory astrophysics. Plasma diagnostic of such plasmas is a longstanding issue. The collective electron plasma mode (plasmon) is revealed in a pump-probe scattering experiment using the high-brilliant radiation to probe the plasma. The distinctive scattering features allow to infer basic plasma properties. For plasmas in thermal equilibrium the electron density and temperature is determined from scattering off the plasmon mode.
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Category :
Languages : en
Pages : 8
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