Bulletin of the American Physical Society
60th Annual Meeting of the APS Division of Plasma Physics
Volume 63, Number 11
Monday–Friday, November 5–9, 2018; Portland, Oregon
Session PO4: Hydrodynamic Instability
2:00 PM–5:00 PM,
Wednesday, November 7, 2018
OCC
Room: B110-112
Chair: Elizabeth Merritt, Los Alamos National Laboratory
Abstract ID: BAPS.2018.DPP.PO4.7
Abstract: PO4.00007 : Experimental observation of hydrodynamic instability inhibition in a material and density gradient*
3:12 PM–3:24 PM
Presenter:
Willow Wan
(Los Alamos Natl Lab)
Authors:
Willow Wan
(Los Alamos Natl Lab)
Evan Dodd
(Los Alamos Natl Lab)
Elizabeth Merritt
(Los Alamos Natl Lab)
Sasikumar Palaniyappan
(Los Alamos Natl Lab)
Tana Cardenas
(Los Alamos Natl Lab)
Joshua P Sauppe
(Los Alamos Natl Lab)
Yuan Ping
(Lawrence Livermore Natl Lab)
Vladimir Smalyuk
(Lawrence Livermore Natl Lab)
Eric Loomis
(Los Alamos Natl Lab)
Hydrodynamic instabilities are a significant degradation mechanism in Inertial Confinement Fusion experiments. These instabilities contribute to a loss of symmetry and an undesired intermixing between the fuel and the capsule that reduces the efficiency of the reaction. This effect is especially prominent at interfaces with sudden and large density changes, such as the surface of the heavy inner-shell in a double-shell capsule implosion. Theory suggests that the growth of these instabilities can be mitigated by replacing the sharp density jump with a smooth density gradient, but these models do not account for certain complex effects such as mixed opacities or equations-of-state.
This experiment compares instability growth between a density jump and a density gradient. A hohlraum is used to accelerate an Al ablator into pure Zr foils, Zr foils with a Be tamper, and density-gradient foils that consists of a linear material gradient of Be to Zr. We infer the growth of seed perturbations using x-ray radiography, and compare these results to 2D simulations performed with RAGE, an Eulerian radiation hydrodynamics code with Adaptive Mesh Refinement.
*This work was supported under the US Department of Energy by the Los Alamos National Security, LLC under contract DE-AC52-06NA25396.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DPP.PO4.7
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700