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Title: Fluorescence and absorption spectroscopy for warm dense matter studies and ICF plasma diagnostics

Abstract

The burning core of an inertial confinement fusion (ICF) plasma produces bright x-rays at stagnation that can directly diagnose core conditions essential for comparison to simulations and understanding fusion yields. These x-rays also backlight the surrounding shell of warm, dense matter, whose properties are critical to understanding the efficacy of the inertial confinement and global morphology. In this work, we show that the absorption and fluorescence spectra of mid-Z impurities or dopants in the warm dense shell can reveal the optical depth, temperature, and density of the shell and help constrain models of warm, dense matter. This is illustrated by the example of a high-resolution spectrum collected from an ICF plasma with a beryllium shell containing native iron impurities. Lastly, analysis of the iron K-edge provides model-independent diagnostics of the shell density (2.3 × 10 24 e/cm 3) and temperature (10 eV), while a 12-eV red shift in Kβ and 5-eV blue shift in the K-edge discriminate among models of warm dense matter: Both shifts are well described by a self-consistent field model based on density functional theory but are not fully consistent with isolated-atom models using ad-hoc density effects.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1441472
Alternate Identifier(s):
OSTI ID: 1424528
Report Number(s):
SAND-2018-4922J
Journal ID: ISSN 1070-664X; 662927; TRN: US1900917
Grant/Contract Number:  
AC04-94AL85000; NA0003525; FWP-14-017426
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; 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

Citation Formats

Hansen, Stephanie B., Harding, Eric C., Knapp, Patrick F., Gomez, Matthew R., Nagayama, Taisuke, and Bailey, James E. Fluorescence and absorption spectroscopy for warm dense matter studies and ICF plasma diagnostics. United States: N. p., 2018. Web. doi:10.1063/1.5018580.
Hansen, Stephanie B., Harding, Eric C., Knapp, Patrick F., Gomez, Matthew R., Nagayama, Taisuke, & Bailey, James E. Fluorescence and absorption spectroscopy for warm dense matter studies and ICF plasma diagnostics. United States. doi:10.1063/1.5018580.
Hansen, Stephanie B., Harding, Eric C., Knapp, Patrick F., Gomez, Matthew R., Nagayama, Taisuke, and Bailey, James E. Wed . "Fluorescence and absorption spectroscopy for warm dense matter studies and ICF plasma diagnostics". United States. doi:10.1063/1.5018580. https://www.osti.gov/servlets/purl/1441472.
@article{osti_1441472,
title = {Fluorescence and absorption spectroscopy for warm dense matter studies and ICF plasma diagnostics},
author = {Hansen, Stephanie B. and Harding, Eric C. and Knapp, Patrick F. and Gomez, Matthew R. and Nagayama, Taisuke and Bailey, James E.},
abstractNote = {The burning core of an inertial confinement fusion (ICF) plasma produces bright x-rays at stagnation that can directly diagnose core conditions essential for comparison to simulations and understanding fusion yields. These x-rays also backlight the surrounding shell of warm, dense matter, whose properties are critical to understanding the efficacy of the inertial confinement and global morphology. In this work, we show that the absorption and fluorescence spectra of mid-Z impurities or dopants in the warm dense shell can reveal the optical depth, temperature, and density of the shell and help constrain models of warm, dense matter. This is illustrated by the example of a high-resolution spectrum collected from an ICF plasma with a beryllium shell containing native iron impurities. Lastly, analysis of the iron K-edge provides model-independent diagnostics of the shell density (2.3 × 1024 e/cm3) and temperature (10 eV), while a 12-eV red shift in Kβ and 5-eV blue shift in the K-edge discriminate among models of warm dense matter: Both shifts are well described by a self-consistent field model based on density functional theory but are not fully consistent with isolated-atom models using ad-hoc density effects.},
doi = {10.1063/1.5018580},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 25,
place = {United States},
year = {2018},
month = {3}
}

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Cited by: 4 works
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