Radiation transport experiments with high temperature, ~350 eV, large scale hohlraums on the NIF
Year: 2011
Type: article
Abstract: The National Ignition Facility (NIF) with its high energy, high power lasers makes it possible to explore fundamental radiation hydrodynamics in new regimes.Such work is important for our understanding of the universe due to its impact on many astrophysical problems.During experiments recently conducted at NIF, a relatively high radiation temperature, ~350 eV, halfhohlraum platform have been developed as a driver for radiation transport experiments.Measurements of the soft x-ray flux escaping from the laser entrance hole have shown the driver to be reproducible to five percent shot-to-shot.Meaning high quality comparisons between shots can be conducted with months in between shots.For these experiments, a 200um thick Si0 2 foam disk was placed outside the physics package hole on the back end of the half-hohlraum.The purpose of this feature is to absorb gold m-band tailoring the spectrum to be more Planckian.The next phase of the project will use these half-hohlraums to study radiation transport through Si0 2 and CH foams contained within a gold tube attached to the back end of the half-hohlraum.The experiments will test models of the equation of state and opacities for these materials .During this presentation, details of the hohlraum drive measurements will be discussed.In addition, details of the planned experiments to validate the foam properties will be presented along with pre-experimental characterization strategies.
Authors: J. L. Kline, Paul Keiter, Kimberley A Obrey, G. R. Magelssen, B. G. DeVolder, Katie Mussack, R. R. Peterson, J. M. Taccetti, N. E. Lanier, J. Workman, Dereck W Schmidt, Christopher E. Hamilton, Deanna Capeli, James R. Williams, R. B. Randolph, Franklin Fierro, J. I. Martinez, Brian M. Patterson, Moore S Alastair, Mark Stevenson, Morton John, T. M. Guymer, N. Bazin, D. Faith, Sarah Gooding
Institution: Los Alamos National Laboratory
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2337881744