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Title: X-ray scattering measurements on imploding CH spheres at the National Ignition Facility

In this study, we have performed spectrally resolved x-ray scattering measurements on highly compressed polystyrene at pressures of several tens of TPa (100 Mbar) created by spherically convergent shocks at the National Ignition Facility. Scattering data of line radiation at 9.0 keV were recorded from the dense plasma shortly after shock coalescence. Accounting for spatial gradients, opacity effects, and source broadening, we demonstrate the sensitivity of the elastic scattering component to carbon K -shell ionization while at the same time constraining the temperature of the dense plasma. Finally, for six times compressed polystyrene, we find an average temperature of 86 eV and carbon ionization state of 4.9, indicating that widely used ionization models need revision in order to be suitable for the extreme states of matter tested in our experiment.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [3] ;  [3] ;  [5] ;  [6] ;  [3] ;  [3] ;  [3] ;  [3] ;  [3] ;  [3] ;  [7] ;  [1] ;  [4] ;  [3]
  1. Univ. of California, Berkeley, CA (United States). Department of Physics
  2. University of Warwick (United Kingdom). Centre for Fusion, Space and Astrophysics, Department of Physics; AWE plc (United Kingdom). Plasma Physics Group, Radiation Physics Department
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. University of Warwick (United Kingdom). Centre for Fusion, Space and Astrophysics, Department of Physics
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  6. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Washington State Univ., Pullman, WA (United States). Institute for Shock Physics
  7. GSI Helmholtzzentrum fur Schwerionenforschung (Germany)
Publication Date:
Report Number(s):
LLNL-JRNL-704306
Journal ID: ISSN 2470-0045; PLEEE8
Grant/Contract Number:
AC52-07NA27344; FG52-10NA29649; NA0001859; 13-ERD-073
Type:
Accepted Manuscript
Journal Name:
Physical Review E
Additional Journal Information:
Journal Volume: 94; Journal Issue: 1; Journal ID: ISSN 2470-0045
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1393340
Alternate Identifier(s):
OSTI ID: 1267540