Recent Results of Radiation Hydrodynamic and Turbulence Experiments in Cylindrical Geometry Page: 4 of 6
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Smooth Marker
- - m .r-Au Marker Band
Boring
- Filagree
..taMeasured
Aual -60
Density Plots
Fig. 3 Experimental radiographs of smooth Fig. 4 Rage simulation of the smooth gold
and rough Gold marker bands Marker layer
respective implosions, which had incident laser energy within 1.4% of each other. The
fundamental result is that we see a relatively thin marker layer with the low-mix, initially
smooth, chlorinated system but a very thick mix region with the high-mix, initially rough,
gold system.
For the second set of experiments the rough and smooth gold marker layers are
compared. The ablator was 60 1 micron. The radiographic images were again taken at
4.75 0.10 nsec and are given in Fig. 3. This experiment illustrates that increasing the
marker layer roughness increases the mix width. However, the smooth result has a much
larger width than expected from 1-D simulations suggesting other physical effects in
addition to mix. The 4.7-keV titanium or 6.9-keV iron K-shell x rays are not energetic
enough to transmit through the mixed gold, and only a mix width and not a radial density
distribution can be determined from the present experiment.
Simulations
Many different hydrocodes are being used to try to predict our experimental results.
Here we present only the Los Alamos effort. The group at AWE has done similar
simulations with their code PETRA and a three-dimensional code called TURMOIL [5].
Direct comparisons of the calculated mix evolution with experiment use the 2D
Lagrangian hydrocode LASNEX [6] to calculate the axial implosion profile along the
radial direction r and axial direction Z assuming symmetry in the azimuthal direction.
The AMR code RAGE [7,8] is used to compare with LASNEX and to calculate the
turbulent mixing in the r-Z or r-O planes, assuming symmetry in the azimuthal or axial
directions, respectively.
LASNEX calculations were done totally integrated using the measured laser power
profile and the three-dimensional laser raytrace package. However, including the surface
roughness in the calculation was not possible with LASNEX. The calculations were done
LTE (Local Thermodynamic Equilibrium) with thermal conduction and multigroup
diffusion radiation transport. Thus, the LASNEX calculations give the expected "zeroth-
order" hydrodynamics including any bowing of the marker and including effects at the
ends of the marker.
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Magelssen, G. R.; Scott, J. M. & Al, Et. Recent Results of Radiation Hydrodynamic and Turbulence Experiments in Cylindrical Geometry, article, August 1, 2001; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc716666/m1/4/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.