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

Hansen, Stephanie B.; Harding, Eric C.; Knapp, Patrick F.; Gomez, Matthew R.; Nagayama, Taisuke; Bailey, James E.

doi:10.1063/1.5018580

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

Journal Article · Wed Mar 07 00:00:00 EST 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5018580· OSTI ID:1441472

Hansen, Stephanie B. ^[1]; Harding, Eric C. ^[1]; Knapp, Patrick F. ^[1]; Gomez, Matthew R. ^[1]; Nagayama, Taisuke ^[1]; Bailey, James E. ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1441472

Alternate ID(s):: OSTI ID: 1424528
OSTI ID: 1479257

Report Number(s):: SAND--2018-4922J; 662927

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 25; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Path integral Monte Carlo simulations of warm dense aluminum Driver, K. P.; Soubiran, F.; Militzer, B. Physical Review E, Vol. 97, Issue 6 https://doi.org/10.1103/physreve.97.063207	journal	June 2018

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