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

Title: Atomic physics modeling of transmission spectra of Sc-doped aerogel foams to support OMEGA experiments

Abstract

Here, we present synthetic transmission spectra generated with PrismSPECT utilizing both the ATBASE model and the Los Alamos opacity library (OPLIB) to evaluate whether an alternative choice in atomic data will impact modeling of experimental data from radiation transport experiments using Sc-doped aerogel foams (ScSi 6O 12 at 75 mg/cm 3 density). We have determined that in the 50-200 eV T e range there is a significant difference in the 1s-3p spectra, especially below 100 eV, and for T e = 200 eV above 5000 eV in photon energy. Examining synthetic spectra generated using OPLIB with 300 resolving power reveals spectral sensitivity to T e changes of ~3 eV.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [2];  [2];  [3];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. AWE Aldermaston, Berkshire, Reading (United Kingdom)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Lockheed Martin, Syracuse, NY (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1414125
Report Number(s):
LA-UR-16-23888
Journal ID: ISSN 0034-6748; TRN: US1800651
Grant/Contract Number:
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 11; Conference: High Temperature Plasma Diagnostics , Madison, WI (United States), 5-6 Jun 2016; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; PrismSPECT; OPLIB; ATBASE; OMEGA; x-ray transmission spectroscopy; radiation transport; Foams; Computer modeling; Opacity; Atomic spectra; Experiment design

Citation Formats

Johns, Heather Marie, Lanier, Nicholas Edward, Kline, John L., Fontes, Christopher John, Perry, Theodore Sonne, Fryer, Christopher Lee, Brown, Colin R. D., Morton, John W., Hager, John D., and Sherrill, Manolo Edgar. Atomic physics modeling of transmission spectra of Sc-doped aerogel foams to support OMEGA experiments. United States: N. p., 2016. Web. doi:10.1063/1.4962195.
Johns, Heather Marie, Lanier, Nicholas Edward, Kline, John L., Fontes, Christopher John, Perry, Theodore Sonne, Fryer, Christopher Lee, Brown, Colin R. D., Morton, John W., Hager, John D., & Sherrill, Manolo Edgar. Atomic physics modeling of transmission spectra of Sc-doped aerogel foams to support OMEGA experiments. United States. doi:10.1063/1.4962195.
Johns, Heather Marie, Lanier, Nicholas Edward, Kline, John L., Fontes, Christopher John, Perry, Theodore Sonne, Fryer, Christopher Lee, Brown, Colin R. D., Morton, John W., Hager, John D., and Sherrill, Manolo Edgar. Wed . "Atomic physics modeling of transmission spectra of Sc-doped aerogel foams to support OMEGA experiments". United States. doi:10.1063/1.4962195. https://www.osti.gov/servlets/purl/1414125.
@article{osti_1414125,
title = {Atomic physics modeling of transmission spectra of Sc-doped aerogel foams to support OMEGA experiments},
author = {Johns, Heather Marie and Lanier, Nicholas Edward and Kline, John L. and Fontes, Christopher John and Perry, Theodore Sonne and Fryer, Christopher Lee and Brown, Colin R. D. and Morton, John W. and Hager, John D. and Sherrill, Manolo Edgar},
abstractNote = {Here, we present synthetic transmission spectra generated with PrismSPECT utilizing both the ATBASE model and the Los Alamos opacity library (OPLIB) to evaluate whether an alternative choice in atomic data will impact modeling of experimental data from radiation transport experiments using Sc-doped aerogel foams (ScSi6O12 at 75 mg/cm3 density). We have determined that in the 50-200 eV Te range there is a significant difference in the 1s-3p spectra, especially below 100 eV, and for Te = 200 eV above 5000 eV in photon energy. Examining synthetic spectra generated using OPLIB with 300 resolving power reveals spectral sensitivity to Te changes of ~3 eV.},
doi = {10.1063/1.4962195},
journal = {Review of Scientific Instruments},
number = 11,
volume = 87,
place = {United States},
year = {Wed Sep 07 00:00:00 EDT 2016},
month = {Wed Sep 07 00:00:00 EDT 2016}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Save / Share:
  • We present synthetic transmission spectra generated with PrismSPECT utilizing both the ATBASE model and the Los Alamos opacity library (OPLIB) to evaluate whether an alternative choice in atomic data will impact modeling of experimental data from radiation transport experiments using Sc-doped aerogel foams (ScSi{sub 6}O{sub 12} at 75 mg/cm{sup 3} density). We have determined that in the 50-200 eV T{sub e} range there is a significant difference in the 1s-3p spectra, especially below 100 eV, and for T{sub e} = 200 eV above 5000 eV in photon energy. Examining synthetic spectra generated using OPLIB with 300 resolving power reveals spectralmore » sensitivity to T{sub e} changes of ∼3 eV.« less
  • Inertial Confinement Fusion (ICF) targets occasionally require the presence of diagnostic dopants to facilitate temperature measurements. To this end poly(4-methyl-1-pentene) (PMP or TPX) foams were produced with very low densities (3 to 5 mg/cc) and low levels of diagnostic dopants. The dopants added to the foams were titanium (Ti), chromium (Cr), and manganese (Mn). The transition metal doped foams were produced with metal loadings as high as 1 wt%, and densities between 3 and 5 mg/cc. The average foam densities were determined using {Beta}-transmission, and the dopant amounts were determined using x-ray fluorescence. Procedures for doped foam production and measurementsmore » of the resulting foam characteristics will be presented. 2 refs., 3 figs., 2 tabs.« less
  • Scandium-doped M-type barium hexagonal ferrites of the composition BaFe12?xScxO19 are well suited for low frequency microwave device applications such as isolators and circulators. A series of Sc-doped M-type barium hexagonal ferrite powders (x = 0-1.2) were prepared by conventional ceramic processing techniques. The resulting powders were verified to be pure phase and maintain the nominal chemical stoichiometry by x-ray diffraction and energy dispersive x-ray spectroscopy, respectively. Static magnetic measurements indicated that both saturation magnetization and uniaxial magnetocrystalline anisotropy field decreased with increasing concentration of scandium. Extended x-ray absorption fine structure measurements were carried out to clarify the correlation between themore » magnetic and atomic structure properties. It is found that the substituted Sc has a strong preference for the bipyramidal site. Nevertheless, the substitution did not introduce additional atomic structural disorder into the barium hexagonal structure. The structural study provided important evidence to quantitatively explain the change in dc and microwave magnetic properties due to Sc ion doping.« less
  • A graded approach to flow and transport modeling has been used as a cost effective solution to evaluating potential groundwater risk in support of Deactivation and Decommissioning activities at the United States Department of Energy's Savannah River Site. This approach incorporates both simple spreadsheet calculations and complex numerical modeling to evaluate the threat to human health posed by contaminants leaching from decommissioned concrete building slabs. Simple spread sheet calculations were used to produce generic slab concentration limits for a suite of radiological and non-radiological contaminants for a chemical separations area at Savannah River Site. These limits, which are based uponmore » the United States Environmental Protection Agency Soil Screening guidance, were used to eliminate most building slabs from further risk assessment. Of the more than 58 facilities located in the area, to date only one slab has been found to have a contaminant concentration in excess of the area specific slab limit. For this slab, a more rigorous numerical modeling effort was undertaken reducing the conservatisms inherent in the spreadsheet calculations. Using the more sophisticated numerical model, it was possible to show that the remaining contaminant of concern would not likely impact groundwater above drinking water standards.« less