Mixing at the Fuel--Ablator Interface in Backlit OMEGA Cryogenic Implosions
ORAL
Abstract
OMEGA cryogenic target implosions show a performance boundary correlated with acceleration-phase shell stability. Direct evidence that this is caused by Rayleigh$-$Taylor fuel--ablator mixing was previously obtained using a backlighter driven by a short pulse generated by OMEGA EP. The radiographic shadow cast by the shell shortly prior to stagnation shows significantly more absorption than post-processed clean simulations predict, evidence of ablator--fuel mix for an unstable implosion ($\alpha $~\textasciitilde ~1.9, IFAR~$=$~14). We show comparison of synthetic radiographs from \textit{DRACO }simulations investigating imprint and other mechanisms such as isolated surface perturbations and uncertainties in the mass ablation rate for reproducing experimental signatures of mix. This material is based upon work supported by the Department of Energy National Nuclear Security Administration under Award Number DE-NA0003856.
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Authors
Tim Collins
LLE
University of Rochester
University of Rochester - LLE
Laboratory for Laser Energetics, University of Rochester
Laboratory for Laser Energetics
C. Stoeckl
University of Rochester
University of Rochester - LLE
Laboratory for Laser Energetics, University of Rochester
Laboratory for Laser Energetics
Laboratory for Laser Energetics, U. of Rochester
University of Rochester, NY 14623, USA
R. Epstein
University of Rochester
Samuel Miller
University of Rochester
Laboratory for Laser Energetics, University of Rochester
Laboratory for laser Energetics, University of Rochester
K. S. Anderson
University of Rochester
D. Cao
University of Rochester
University of Rochester - LLE
Laboratory for Laser Energetics, University of Rochester
Laboratory for Laser Energetics, U. of Rochester
Laboratory for Laser Energetics
C.J. Forrest
University of Rochester - LLE
Laboratory for Laser Energetics
Laboratory for Laser Energetics, University of Rochester
LLE
University of Rochester
V. N. Goncharov
Laboratory for Laser Energetics
University of Rochester, Laboratory for Laser Energetics
University of Rochester - LLE
Laboratory for Laser Energetics, University of Rochester
Laboratory for Laser Energetics, U. of Rochester
University of Rochester
Laboratory for laser Energetics, University of Rochester
D. W. Jacobs-Perkins
University of Rochester
T. Z. Kosc
University of Rochester
O. M. Mannion
Laboratory for Laser Energetics, University of Rochester
University of Rochester
Laboratory for Laser Energetics
John Marozas
Laboratory for Laser Energetics, U. of Rochester
LLE
University of Rochester, Laboratory for Laser Energetics
University of Rochester - LLE
University of Rochester
Laboratory for Laser Energetics
S. F. B. Morse
University of Rochester
Sean Regan
LLE
University of Rochester, Laboratory for Laser Energetics
University of Rochester - LLE
University of Rochester
Laboratory for Laser Energetics, U. of Rochester
Laboratory for Laser Energetics, University of Rochester
Laboratory for Laser Energetics
P. B. Radha
Laboratory for Laser Energetics, U. of Rochester
University of Rochester
Craig Sangster
Laboratory for Laser Energetics, University of Rochester
