X-ray spectroscopy from fusion plasmas

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Our understanding of laser energy coupling into laser-driven inertial confinement fusion targets largely depends on our ability to accurately measure and simulate the plasma conditions in the underdense corona and in high density capsule implosions. X-ray spectroscopy is an important technique which has been applied to measure the total absorption of laser energy into the fusion target, the fraction of laser energy absorbed by hot electrons, and the conditions in the fusion capsule in terms of density and temperature. These parameters provide critical benchmarking data for performance studies of the fusion target and for radiation-hydrodynamic and laser-plasma interaction simulations. Using ... continued below

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Glenzer, S H August 12, 1998.

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Our understanding of laser energy coupling into laser-driven inertial confinement fusion targets largely depends on our ability to accurately measure and simulate the plasma conditions in the underdense corona and in high density capsule implosions. X-ray spectroscopy is an important technique which has been applied to measure the total absorption of laser energy into the fusion target, the fraction of laser energy absorbed by hot electrons, and the conditions in the fusion capsule in terms of density and temperature. These parameters provide critical benchmarking data for performance studies of the fusion target and for radiation-hydrodynamic and laser-plasma interaction simulations. Using x-ray spectroscopic techniques for these tasks has required its application to non-standard conditions where kinetics models have not been extensively tested. In particular, for the conditions in high density implosions, where electron temperatures achieve 1 - 2 keV and electron densities reach 10<sup>24</sup> cm<sup>-3</sup> evolving on time scales of < 1 ns, no independent non-spectroscopic measurements of plasma parameters are available. For these reasons, we have performed experiments in open-geometry gas bag plasmas at densities of 10<sup>21</sup> cm<sup>-3</sup> and which am independently diagnosed with Thomson scattering and stimulated Raman scattering. We find that kinetics modeling is in good agreement with measured intensities of the dielectronic satellites of the He-{beta} line (n= l-3) of Ar XVII. Applying these findings to the experimental results of capsule implosions provides additional evidence of� temperature gradients at peak compression.

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  • Proceedings for the 14th International Conference on Spectral Line Shapes, State College, PA, June 22-26, 1998

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  • Other: DE00007390
  • Report No.: UCRL-JC-130122
  • Grant Number: W-7405-Eng-48
  • Office of Scientific & Technical Information Report Number: 7390
  • Archival Resource Key: ark:/67531/metadc711583

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • August 12, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • May 6, 2016, 11:10 p.m.

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Glenzer, S H. X-ray spectroscopy from fusion plasmas, article, August 12, 1998; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc711583/: accessed July 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.