Compton scattering measurements from dense plasmas

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Compton scattering has been developed for accurate measurements of densities and temperatures in dense plasmas. One future challenge is the application of this technique to characterize compressed matter on the National Ignition Facility where hydrogen and beryllium will approach extremely dense states of matter of up to 1000 g/cc. In this regime, the density, compressibility, and capsule fuel adiabat may be directly measured from the Compton scattered spectrum of a high-energy x-ray line source. Specifically, the scattered spectra directly reflect the electron velocity distribution. In non-degenerate plasmas, the width provides an accurate measure of the electron temperatures, while in partially ... continued below

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7 p. (0.2 MB)

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Glenzer, S H; Neumayer, P; Doeppner, T; Landen, L; Lee, R W; Wallace, R et al. October 2, 2007.

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Description

Compton scattering has been developed for accurate measurements of densities and temperatures in dense plasmas. One future challenge is the application of this technique to characterize compressed matter on the National Ignition Facility where hydrogen and beryllium will approach extremely dense states of matter of up to 1000 g/cc. In this regime, the density, compressibility, and capsule fuel adiabat may be directly measured from the Compton scattered spectrum of a high-energy x-ray line source. Specifically, the scattered spectra directly reflect the electron velocity distribution. In non-degenerate plasmas, the width provides an accurate measure of the electron temperatures, while in partially Fermi degenerate systems that occur in laser-compressed matter it provides the Fermi energy and hence the electron density. Both of these regimes have been accessed in experiments at the Omega laser by employing isochorically heated solid-density beryllium and moderately compressed beryllium foil targets. In the latter experiment, compressions by a factor of 3 at pressures of 40 Mbar have been measured in excellent agreement with radiation hydrodynamic modeling.

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7 p. (0.2 MB)

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PDF-file: 7 pages; size: 0.2 Mbytes

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  • Presented at: 5th International Conference on Inertial Fusion Sciences and Applicatons, Kobe, Japan, Sep 10 - Sep 14, 2007

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  • Report No.: UCRL-CONF-235336
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 922782
  • Archival Resource Key: ark:/67531/metadc894626

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  • October 2, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • April 17, 2017, 12:52 p.m.

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Glenzer, S H; Neumayer, P; Doeppner, T; Landen, L; Lee, R W; Wallace, R et al. Compton scattering measurements from dense plasmas, article, October 2, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc894626/: accessed September 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.