Design of dynamic Hohlraum opacity samples to increase measured sample density on Z

Journal Article · Fri Oct 15 00:00:00 EDT 2010 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3483230· OSTI ID:22058736

Nash, T J; Rochau, G A; Bailey, J E ^[1]

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1. Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)

We are attempting to measure the transmission of iron on Z at plasma temperatures and densities relevant to the solar radiation and convection zone boundary. The opacity data published by us to date has been taken at an electron density about a factor of 10 below the 9x10{sup 22}/cm{sup 3} electron density of this boundary. We present results of two-dimensional (2D) simulations of the heating and expansion of an opacity sample driven by the dynamic Hohlraum radiation source on Z. The aim of the simulations is to design foil samples that provide opacity data at increased density. The inputs or source terms for the simulations are spatially and temporally varying radiation temperatures with a Lambertian angular distribution. These temperature profiles were inferred on Z with on-axis time-resolved pinhole cameras, x-ray diodes, and bolometers. A typical sample is 0.3 {mu}m of magnesium and 0.078 {mu}m of iron sandwiched between 10 {mu}m layers of plastic. The 2D LASNEX simulations indicate that to increase the density of the sample one should increase the thickness of the plastic backing.

• OSTI ID: 22058736
• Journal Information: Review of Scientific Instruments, Vol. 81, Issue 10; Other Information: (c) 2010 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ANGULAR DISTRIBUTION
BOLOMETERS
CAMERAS
CONVECTION
ELECTRON DENSITY
ELECTRON TEMPERATURE
FOILS
HEATING
ION TEMPERATURE
IRON
MAGNESIUM
OPACITY
PLASMA DENSITY
PLASTICS
RADIATION SOURCES
SOLAR RADIATION
SOURCE TERMS
TIME RESOLUTION
TWO-DIMENSIONAL CALCULATIONS
X RADIATION