Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session YI01: High Energy Density/Laser Plasmas
9:30 AM–12:30 PM,
Friday, October 21, 2022
Room: Ballroom 100 A
Chair: Mark Schmitt, LANL
Abstract: YI01.00002 : Mix at the interface – Diffusion-dominated mixing phenomena probed by high-resolution separated reactant experiments*
10:00 AM–10:30 AM
Presenter:
Kevin D Meaney
(Los Alamos National Lab)
Author:
Kevin D Meaney
(Los Alamos National Lab)
By placing a thin (150 nm) deuterated plastic layer in the shell of OMEGA capsules and measuring the deuterium-tritium (DT) yield as a mix metric, one obtains a high level of mix sensitivity through the fusion yield and high initial spatial specificity. Over the past five years, 65 implosions studying the spatial source of shell mix within the 1st micron of shell-fuel interface on moderate convergence implosions has revealed a complex mix landscape unseen with historically thick separated reactant campaigns. The higher resolution data shows that plasma diffusion on the interface, driven through gradients of temperature and density - a kinetic process - is an important effect in even moderate convergence implosions. Furthermore, the close interface is sensitive across the transition away from diffusion to traditional hydrodynamically driven instabilities, as well as the mix effects from capsule mounting stalks, placement offsets, capsule fabrication and laser delivery variations. Comparisons of the dataset with Fokker-Planck, Zimmerman–Paquette–Kagan–Zhdanov (ZPKZ) and bubble-drag mix models demonstrates the applicability and trade-offs of such models. The relatively large and specific dataset offers novel insights into mix mechanisms for ICF capsules.
*This work was performed under the auspices of the U.S. Department of Energy by Los Alamos National Lab under Contract No. 89233218CNA000001
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