Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session YO05: ICF: Equations of State
9:30 AM–12:06 PM,
Friday, October 21, 2022
Room: Ballroom 111 B
Chair: Marius Millot, LLNL; Arijit Bose, University of Delaware
Abstract: YO05.00002 : EXAFS for probing thermal states of compressed materials at NIF*
9:42 AM–9:54 AM
Presenter:
Yuan Ping
(Lawrence Livermore Natl Lab)
Authors:
Yuan Ping
(Lawrence Livermore Natl Lab)
Hong W Sio
(Lawrence Livermore Natl Lab)
Andrew Krygier
(Lawrence Livermore National Laboratory)
Dave Braun
(Lawrence Livermore National Laboratory)
Robert E Rudd
(Lawrence Livermore Natl Lab)
Stanimir Bonev
(Lawrence Livermore National Laboratory)
Amy L Coleman
(Lawrence Livermore Natl Lab)
Federica Coppari
(Lawrence Livermore Natl Lab)
David K Bradley
(Lawrence Livermore Natl Lab)
Jon H Eggert
(Lawrence Livermore Natl Lab)
Dayne E Fratanduono
(Lawrence Livermore Natl Lab)
Warren W Hsing
(Lawrence Livermore Natl Lab)
Gregory E Kemp
(Lawrence Livermore National Laboratory)
Bernard Kozioziemski
(Lawrence Livermore Natl Lab)
Tom Lockard
(Lawrence Livermore Natl Lab)
Andy J Mackinnon
(Lawrence Livermore Natl Lab)
James M McNaney
(Lawrence Livermore Natl Lab)
Marius Millot
(Lawrence Livermore Natl Lab)
Neil Ose
(Lawrence Livermore National Laboratory)
Hye-Sook Park
(Lawrence Livermore Natl Lab)
Marilyn B Schneider
(Lawrence Livermore Natl Lab)
Stanislav Stoupin
(Lawrence Livermore National Laboratory)
Manfred L Bitter
(Princeton Plasma Physics Laboratory)
Philip C Efthimion
(Princeton Plasma Physics Laboratory)
Lan Gao
(PPPL)
Kenneth W Hill
(Princeton University)
Brooklyn Frances Kraus
(Princeton Plasma Physics Laboratory)
Novimir A Pablant
(Princeton Plasma Physics Laboratory)
EXAFS (Extended X-ray Absorption Fine Structure) refers to the oscillatory modulations in x-ray absorption spectra above an absorption edge, generated by interference between photoelectron waves and scattering by neighbor atoms. EXAFS is sensitive to temperature of materials in the range of 100-10000K because ionic thermal motion reduces the coherence of the interference, leading to decay of the modulations. This talk will give a brief overview of the EXAFS platform at NIF, including development of a bright continuum backlighter [1], a high-resolution spectrometer [2], and a novel shape of crystal to achieve both high throughput and high resolution [3]. Excellent EXAFS data at K-edge have been obtained for Fe compressed up to 8 Mbar and Cu up to 10 Mbar. The EXAFS measurements at L-edge are more challenging due to smaller EXAFS amplitude. The high x-ray flux at NIF has enabled L-edge measurements for higher-Z materials such as Ta and Pb. The prospect of such a new capability at NIF for probing thermal states of compressed materials will be discussed.
*This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
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