Absorption measurements of radiatively heated low-Z materials

Conference · Sun Jan 07 00:00:00 EST 1990

OSTI ID:5905191

Hammel, B A; Kania, D R; Seely, J F; Doyas, R; Lee, R W; Igelsias, C A

We are studying the opacity of radiatively 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 {mu}m light in a 1-ns pulse) is incident on a Au burn-through foil (0.25 {mu}m thick), producing a soft x-ray source that radiatively heats a low-Z sample. The sample is {approximately}1 {mu}m 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 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} > 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. 4 refs., 9 figs.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5905191
• Report Number(s): UCRL-JC-105910; CONF-9010298-8; ON: DE91011182
• Resource Relation: Conference: International workshop on radiative properties of hot dense matter, Sarasota, FL (USA), 22-26 Oct 1990
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
FOILS
RADIATION ABSORPTION ANALYSIS
ABSORPTION SPECTRA
BORON
GOLD
NITROGEN
NOVA FACILITY
OPACITY
X RADIATION
CHEMICAL ANALYSIS
ELECTROMAGNETIC RADIATION
ELEMENTS
IONIZING RADIATIONS
METALS
NONDESTRUCTIVE ANALYSIS
NONMETALS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
SEMIMETALS
SPECTRA
TRANSITION ELEMENTS
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