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

Saunders, A. M.; Chapman, D. A.; Kritcher, A. L.; Schoff, M.; Shuldberg, C.; Landen, O. L.; Glenzer, S. H.; Falcone, R. W.; Gericke, D. O.; Döppner, T.

doi:10.1016/j.hedp.2018.02.003

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

Journal Article · 28 February 2018 · High Energy Density Physics

DOI: https://doi.org/10.1016/j.hedp.2018.02.003 · OSTI ID:1426137

^[1]; Chapman, D. A. ^[2]; Kritcher, A. L. ^[3]; Schoff, M. ^[4];

^[4];

^[3]; Glenzer, S. H. ^[5]; Falcone, R. W. ^[1]; Gericke, D. O. ^[6]; Döppner, T. ^[3]

Univ. of California, Berkeley, CA (United States). Physics Department
AWE plc, Aldermaston, Reading (United Kingdom); University of Warwick (United Kingdom). Centre for Fusion, Space and Astrophysics, Department of Physics
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
General Atomics, San Diego, CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States)
University of Warwick (United Kingdom). Centre for Fusion, Space and Astrophysics, Department of Physics

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.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: AC52-07NA27344; SC0018298; NA0002135; AC52-06NA27279

OSTI ID:: 1426137

Alternate ID(s):: OSTI ID: 1548686

Report Number(s):: LLNL-JRNL--742926

Journal Information:: High Energy Density Physics, Journal Name: High Energy Density Physics Journal Issue: C Vol. 26; ISSN 1574-1818

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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

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