The Effect of Bound States on X-ray Thomson Scattering for Partially Ionized Plasmas PDF Download
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Author:
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Category :
Languages : en
Pages : 13
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Author:
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ISBN:
Category :
Languages : en
Pages : 13
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Author:
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Category :
Languages : en
Pages : 8
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Author:
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Category :
Languages : en
Pages : 8
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Author:
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Category :
Languages : en
Pages : 27
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Book Description
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 : 27
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The authors present analytical expressions for the dynamic structure factor, or form factor S(k, [omega]), which is the quantity describing the inelastic x-ray cross section from a dense plasma or a simple liquid. The results, based on the random phase approximation (RPA) for the treatment on the charged particle coupling, can be applied to describe scattering from either weakly coupled classical plasmas or degenerate electron liquids. The form factor correctly reproduces the Compton energy downshift and the usual Fermi-Dirac electron velocity distribution for S(k, [omega]) in the case of a cold degenerate plasma. the usual concept of scattering parameter is also reinterpreted for the degenerate case in order to include the effect of the Thomas-Fermi screening. The results shown in this work can be applied to interpreting x-ray scattering in warm dense plasmas occurring in inertial confinement fusion experiments or inside the interior of planets.
Author: Richard G. Seasholtz
Publisher:
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Category : Magnetic fields
Languages : en
Pages : 45
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Book Description
The theory of Thomson scattering from a weakly ionized plasma is extended to include the effects of unequal electron and ion temperatures, a constant magnetic field, and electron drift. The plasma is described by the two fluid continuum equations that are valid if the wavelength of the probing wave is longer than the ion-neutral mean free path. The spectrum and total scattered power are calculated. Collisions and a magnetic field are both shown to influence the scattered power for unequal electron and ion temperatures.
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Category :
Languages : en
Pages : 12
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Author: Gerd Ropke
Publisher: World Scientific
ISBN: 9814474517
Category : Science
Languages : en
Pages : 571
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Book Description
This series on condensed matter theories provides a forum for advanced theoretical research in quantum many-body theory. The contributions are highly interdisciplinary, emphasizing common concerns among theorists who apply many-particle methods in such diverse areas as solid-state, low-temperature, statistical, nuclear, particle, and biological physics, as well as in quantum field theory, quantum information and the theory of complex systems. Each individual contribution is preceded by an extended introduction to the topic treated. Useful details not normally presented in journal articles can be found in this volume.
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Category : Nuclear energy
Languages : en
Pages : 844
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Author:
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Category :
Languages : en
Pages : 35
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We discuss the extension of the powerful technique of Thomson scattering to the x-ray regime for providing an independent measure of plasma parameters for dense plasmas. By spectrally-resolving the scattering, the coherent (Rayleigh) unshifted scattering component can be separated from the incoherent Thomson component, which is both Compton and Doppler shifted. The free electron density and temperature can then be inferred from the spectral shape of the high frequency Thomson scattering component. In addition, as the plasma temperature is decreased, the electron velocity distribution as measured by incoherent Thomson scattering will make a transition from the traditional Gaussian Boltzmann distribution to a density-dependent parabolic Fermi distribution to. We also present a discussion for a proof-of-principle experiment appropriate for a high energy laser facility.
