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Title: Influence of argon impurities on the elastic scattering of x-rays from imploding beryllium capsules

Here, we investigate the effect of argon impurities on the elastic component of x-ray scattering spectra taken from directly driven beryllium capsule implosions at the OMEGA laser. The plasma conditions were obtained in a previous analysis [18] by fitting the inelastic scattering component. We show that the known argon impurity in the beryllium modifies the elastic scattering due to the larger number of bound electrons. We indeed find significant deviations in the elastic scattering from roughly 1 at.% argon contained in the beryllium. With knowledge of the argon impurity fraction, we use the elastic scattering component to determine the charge state of the compressed beryllium, as the fits are rather insensitive to the argon charge state. Lastly, we discuss how doping small fractions of mid- or high-Z elements into low-Z materials could allow ionization balance studies in dense plasmas.
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [4] ; ORCiD logo [4] ; ORCiD logo [3] ;  [5] ;  [1] ;  [6] ;  [3]
  1. Univ. of California, Berkeley, CA (United States). Physics Department
  2. AWE plc, Aldermaston, Reading (United Kingdom); University of Warwick (United Kingdom). Centre for Fusion, Space and Astrophysics, Department of Physics
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. General Atomics, San Diego, CA (United States)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  6. University of Warwick (United Kingdom). Centre for Fusion, Space and Astrophysics, Department of Physics
Publication Date:
Report Number(s):
LLNL-JRNL-742926
Journal ID: ISSN 1574-1818
Grant/Contract Number:
AC52-07NA27344; SC0018298; NA0002135; AC52-06NA27279
Type:
Accepted Manuscript
Journal Name:
High Energy Density Physics
Additional Journal Information:
Journal Volume: 26; Journal Issue: C; Journal ID: ISSN 1574-1818
Publisher:
Elsevier
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; Warm-dense-matter; Dense plasmas; X-ray Thomson scattering; Ionization balance
OSTI Identifier:
1426137