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Title: X-ray Thomson scattering measurements of temperature and density from multi-shocked CH capsules

Abstract

Proof-of-principle measurements of the electron densities, temperatures, and ionization states of spherically compressed multi-shocked CH (polystyrene) capsules have been achieved using spectrally resolved x-ray Thomson scattering. A total energy of 13.5 kJ incident on target is used to compress a 70μm thick CH shell above solid-mass density using three coalescing shocks. Separately, a laser-produced zinc He-α x-ray source at 9 keV delayed 200 ps-800 ps after maximum compression is used to probe the plasma in the non-collective scattering regime. The data show that x-ray Thomson scattering enables a complete description of the time-dependent hydrodynamic evolution of shock-compressed CH capsules, with a maximum measured density of ρ > 6 g cm -3. Additionally, the results demonstrate that accurate measurements of x-ray scattering from bound-free transitions in the CH plasma demonstrate strong evidence that continuum lowering is the primary ionization mechanism of carbon L-shell electrons.

Authors:
 [1];  [2];  [2];  [2];  [2];  [3];  [2];  [2];  [4];  [5];  [4];  [6];  [2]
  1. Univ. of California, Berkeley, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Los Angeles, CA (United States)
  4. Univ. of Warwick, Coventry (United Kingdom)
  5. Univ. of Warwick, Coventry (United Kingdom); AWE plc, Aldermaston (United Kingdom)
  6. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Univ. of California, Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1334509
Alternate Identifier(s):
OSTI ID: 1240054
Report Number(s):
LLNL-JRNL-611992
Journal ID: ISSN 1070-664X; PHPAEN
Grant/Contract Number:  
FG52-06NA26212; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 20; Journal Issue: 5; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; x-ray scattering; ionization; electron scattering; inelastic scattering; carbon; 42 ENGINEERING; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Fletcher, L. B., Kritcher, A., Pak, A., Ma, T., Doppner, T., Fortmann, C., Divol, L., Landen, O. L., Vorberger, J., Chapman, D. A., Gericke, D. O., Falcone, R. W., and Glenzer, S. H. X-ray Thomson scattering measurements of temperature and density from multi-shocked CH capsules. United States: N. p., 2013. Web. doi:10.1063/1.4807032.
Fletcher, L. B., Kritcher, A., Pak, A., Ma, T., Doppner, T., Fortmann, C., Divol, L., Landen, O. L., Vorberger, J., Chapman, D. A., Gericke, D. O., Falcone, R. W., & Glenzer, S. H. X-ray Thomson scattering measurements of temperature and density from multi-shocked CH capsules. United States. doi:10.1063/1.4807032.
Fletcher, L. B., Kritcher, A., Pak, A., Ma, T., Doppner, T., Fortmann, C., Divol, L., Landen, O. L., Vorberger, J., Chapman, D. A., Gericke, D. O., Falcone, R. W., and Glenzer, S. H. Fri . "X-ray Thomson scattering measurements of temperature and density from multi-shocked CH capsules". United States. doi:10.1063/1.4807032. https://www.osti.gov/servlets/purl/1334509.
@article{osti_1334509,
title = {X-ray Thomson scattering measurements of temperature and density from multi-shocked CH capsules},
author = {Fletcher, L. B. and Kritcher, A. and Pak, A. and Ma, T. and Doppner, T. and Fortmann, C. and Divol, L. and Landen, O. L. and Vorberger, J. and Chapman, D. A. and Gericke, D. O. and Falcone, R. W. and Glenzer, S. H.},
abstractNote = {Proof-of-principle measurements of the electron densities, temperatures, and ionization states of spherically compressed multi-shocked CH (polystyrene) capsules have been achieved using spectrally resolved x-ray Thomson scattering. A total energy of 13.5 kJ incident on target is used to compress a 70μm thick CH shell above solid-mass density using three coalescing shocks. Separately, a laser-produced zinc He-α x-ray source at 9 keV delayed 200 ps-800 ps after maximum compression is used to probe the plasma in the non-collective scattering regime. The data show that x-ray Thomson scattering enables a complete description of the time-dependent hydrodynamic evolution of shock-compressed CH capsules, with a maximum measured density of ρ > 6 g cm-3. Additionally, the results demonstrate that accurate measurements of x-ray scattering from bound-free transitions in the CH plasma demonstrate strong evidence that continuum lowering is the primary ionization mechanism of carbon L-shell electrons.},
doi = {10.1063/1.4807032},
journal = {Physics of Plasmas},
number = 5,
volume = 20,
place = {United States},
year = {2013},
month = {5}
}

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