Observations of Continuum Depression in Warm Dense Matter with X-Ray Thomson Scattering

Fletcher, L. B.; Kritcher, A. L.; Pak, A.; Ma, T.; Doppner, T.; Fortmann, C.; Divol, L.; Jones, O. S.; Landen, O. L.; Scott, H. A.; Vorberger, J.; Chapman, D. A.; Gericke, D. O.; Mattern, B. A.; Seidler, G. T.; Gregori, G.; Falcone, R. W.; Glenzer, S. H.

doi:10.1103/PhysRevLett.112.145004

Title: Observations of Continuum Depression in Warm Dense Matter with X-Ray Thomson Scattering

Journal Article · Thu Apr 10 00:00:00 EDT 2014 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.112.145004· OSTI ID:1334520

Fletcher, L. B. ^[1]; Kritcher, A. L. ^[2]; Pak, A. ^[2]; Ma, T. ^[2]; Doppner, T. ^[2]; Fortmann, C. ^[2]; Divol, L. ^[2]; Jones, O. S. ^[2]; Landen, O. L. ^[2]; Scott, H. A. ^[2]; Vorberger, J. ^[3]; Chapman, D. A. ^[4]; Gericke, D. O. ^[5]; Mattern, B. A. ^[6]; Seidler, G. T. ^[6]; Gregori, G. ^[7]; Falcone, R. W. ^[8]; Glenzer, S. H. ^[9]

SLAC National Accelerator Lab., Menlo Park, CA (United States); Univ. of California, Berkeley, CA (United States)
Lawrence Livermore National Lab. (LLNL), Univ. of California, Livermore, CA (United States)
Max-Planck-Institut fur die Physik Komplexer Systeme, Dresden (Germany)
AWE plc, Reading (United Kingdom); Univ. of Warwick, Coventry (United Kingdom)
Univ. of Warwick, Coventry (United Kingdom)
Univ. of Washington, Seattle, WA (United States)
Univ. of Oxford, Oxford (United Kingdom)
Univ. of California, Berkeley, CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States)

Detailed measurements of the electron densities, temperatures, and ionization states of compressed CH shells approaching pressures of 50 Mbar are achieved with spectrally resolved x-ray scattering. Laser- produced 9 keV x-rays probe the plasma during the transient state of three-shock coalescence. High signal- to-noise x-ray scattering spectra show direct evidence of continuum depression in highly degenerate warm dense matter states with electron densities $$n_e$$ > 10²⁴ cm^–3. Furthermore, the measured densities and temperatures agree well with radiation-hydrodynamic modeling when accounting for continuum lowering in calculations that employ detailed configuration accounting.

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Research Organization:: University of California, Berkeley, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Engineering and Physical Sciences Research Council (EPSRC)

Grant/Contract Number:: NA0000910; AC52-07NA27344; 11-ER-050; FWP 100182; AC02-76SF00515; FG52-07NA28057; FG52-09NA29035; EP/G007187/1; SC0008580

OSTI ID:: 1334520

Journal Information:: Physical Review Letters, Vol. 112, Issue 14; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 88 works

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