Development on the National Ignition Facility of a High Energy Density Opacity Platform [electronic resource].
- Washington, D.C. : United States. Dept. of Energy, 2017. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
- Physical Description:
- 10 pages : digital, PDF file
- Additional Creators:
- Los Alamos National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- X-ray opacity is a crucial factor in all radiation-hydrodynamics calculations, yet it is one of the least validated of the material properties in simulation codes for high-energy-density plasmas. Recent opacity experiments at the Sandia Z-machine have shown up to factors of two discrepancies between theory and experiment for various mid-Z elements (Fe, Cr, Ni). These discrepancies raise doubts regarding the accuracy of the opacity models which are used in ICF and stewardship as well as in astrophysics. Therefore, a new experimental opacity platform has been developed on the National Ignition Facility (NIF), not only to verify the Z-machine experimental results, but also to extend the experiments to other temperatures and densities. Within the context of the national opacity strategy, the first NIF experiments were directed towards measuring the opacity of iron at a temperature of ~160 eV and an electron density of ~7xl021 cm-3(Anchor 1). The Z data agree with theory at these conditions, providing a reference point for validation of the NIF platform. Development shots on NIF have demonstrated the ability to create a sufficiently bright point backlighter using an imploding plastic capsule, and also a combined hohlraum, sample and laser drive able to produce iron plasmas at the desired conditions. Spectrometer qualification has been completed, albeit with additional improvements planned, and the first iron absorption spectra have now been obtained.
- Published through SciTech Connect., 10/02/2017., "la--ur-17-28950", and Theodore Sonne Perry; Evan S. Dodd; Barbara Gloria DeVolder; Heather Marie Johns; Tana Cardenas; Thomas Nick Archuleta; John L. Kline; Kirk Adler Flippo; Natalia Sergeevna Vinyard; Manolo Edgar Sherrill; Bernhard Heinz Wilde; Ian Lee Tregillis; Todd James Urbatsch; Melissa Rae Douglas; R. F. Heeter; D. A. Liedahl; B. G. Wilson; C. A. Iglesias; M. B. Schneider; M. E. Martin; R. A. London; M. F. Ahmed; N. B. Thompson; J. A. Emig; M. R. Zika; et al.
- Funding Information:
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