skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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 70 μm 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{sup −3}. In addition, 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]; ;  [3];  [3];  [1]
  1. Department of Physics, University of California, Berkeley, California 94720 (United States)
  2. Lawrence Livermore National Laboratory, 7000 East Av., Livermore, California 94550 (United States)
  3. Department of Physics, Centre for Fusion, Space, and Astrophysics, University of Warwick, Coventry CV4 7AL (United Kingdom)
Publication Date:
OSTI Identifier:
22228105
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 20; Journal Issue: 5; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CAPSULES; CARBON; COMPRESSION; ELECTRON DENSITY; ELECTRON TEMPERATURE; ELECTRONS; ENERGY-LEVEL TRANSITIONS; HYDRODYNAMICS; ION TEMPERATURE; L SHELL; LASER-PRODUCED PLASMA; PLASMA DENSITY; PLASMA DIAGNOSTICS; POLYSTYRENE; SHOCK WAVES; THOMSON SCATTERING; X RADIATION; X-RAY DIFFRACTION; ZINC

Citation Formats

Fletcher, L. B., Kritcher, A., Pak, A., Ma, T., Döppner, T., Divol, L., Landen, O. L., Glenzer, S. H., Fortmann, C., University of California, Los Angeles, California 90095, Vorberger, J., Gericke, D. O., Chapman, D. A., Plasma Physics Department, AWE plc, Aldermaston, Falcone, R. W., and Lawrence Berkeley National Laboratory, Berkeley, California 94720. 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., Döppner, T., Divol, L., Landen, O. L., Glenzer, S. H., Fortmann, C., University of California, Los Angeles, California 90095, Vorberger, J., Gericke, D. O., Chapman, D. A., Plasma Physics Department, AWE plc, Aldermaston, Falcone, R. W., & Lawrence Berkeley National Laboratory, Berkeley, California 94720. X-ray Thomson scattering measurements of temperature and density from multi-shocked CH capsules. United States. https://doi.org/10.1063/1.4807032
Fletcher, L. B., Kritcher, A., Pak, A., Ma, T., Döppner, T., Divol, L., Landen, O. L., Glenzer, S. H., Fortmann, C., University of California, Los Angeles, California 90095, Vorberger, J., Gericke, D. O., Chapman, D. A., Plasma Physics Department, AWE plc, Aldermaston, Falcone, R. W., and Lawrence Berkeley National Laboratory, Berkeley, California 94720. 2013. "X-ray Thomson scattering measurements of temperature and density from multi-shocked CH capsules". United States. https://doi.org/10.1063/1.4807032.
@article{osti_22228105,
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 Döppner, T. and Divol, L. and Landen, O. L. and Glenzer, S. H. and Fortmann, C. and University of California, Los Angeles, California 90095 and Vorberger, J. and Gericke, D. O. and Chapman, D. A. and Plasma Physics Department, AWE plc, Aldermaston and Falcone, R. W. and Lawrence Berkeley National Laboratory, Berkeley, California 94720},
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 70 μm 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{sup −3}. In addition, 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},
url = {https://www.osti.gov/biblio/22228105}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 20,
place = {United States},
year = {Wed May 15 00:00:00 EDT 2013},
month = {Wed May 15 00:00:00 EDT 2013}
}

Works referencing / citing this record:

Density functional theory calculations of continuum lowering in strongly coupled plasmas
journal, March 2014