Absorption measurements of radiatively heated low-Z materials

Details Absorption measurements of radiatively heated low-Z materials Absorption measurements of radiatively heated low-Z materials

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990rphd.work...22h&link_type=abstract

Presented at the International Workshop on Radiative Properties of Hot Dense Matter, Sarasota, 22-26 Oct. 1990

Computer Science

Absorption Spectra, Chemical Analysis, Foils (Materials), Radiation Absorption, X Rays, Absorption Spectroscopy, Boron, Gold, Nitrogen

Scientific paper

The opacity of radicatively heated low-Z foils (Z = 5-7) in the spectral region of their k-edges (approximately 200-500 eV), with the eventual goal of investigating radiative transfer in non-LTE plasmas. In these experiments one arm of the NOVA laser (4.2 kJ of 0.53 micron light in a 1 ns pulse) is incident on a Au burn-through foil (0.25 micron thick), producing a soft x ray source that radiatively heats a low-Z sample. The sample is approximatly 1 micron thick and is placed in close proximity to the Au foil. Absorption spectra are obtained by either viewing the soft x rays from the Au foil passing through the sample, or by using the Au foil passing through the sample, or by using a second arm of the NOVA laser to create an independent x-ray backlighter pulse from a separate Au foil at a specific time. High resolution spectral measurements (lambda/lambda delta is greater than 3000) are obtained with a 3 m Rowland circle instrument: data are recorded on Kodak 101-05 photographic plate. Preliminary comparisons with a low-Z opacity code, OPAL, are presented.

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