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Title: Test of Thermal Transport Models through Dynamic Overpressure Stabilization of Ablation-Front Perturbation Growth in Laser-Driven CH Foils

Abstract

Heat-flow-induced dynamic overpressure at the perturbed ablation front of an ICF target can stabilize the ablative Richtmyer/Meshkov-like instability and mitigate the subsequent ablative Rayleigh/Taylor (RT) instability. A series of experiments was performed on the OMEGA laser to quantify the dynamic overpressure stabilization during the shock transit. Analysis of the experimental data using hydrocode simulations shows that the observed oscillatory evolution of the ablation-front perturbations depends on Dc, the size of the thermal conduction zone, and the fluid velocity in the blowoff region Vbl that are sensitive to the thermal transport model used. We show that the simulations match the experiment well when the time dependence of the heat-flux inhibition is taken into account using a recently developed nonlocal heat transport model.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Laboratory for Laser Energetics, University of Rochester, Rochester, NY
Sponsoring Org.:
USDOE
OSTI Identifier:
878460
Report Number(s):
DOE/SF/19460-660
1621; 2005-159
DOE Contract Number:  
FC52-92SF19460
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 96
Country of Publication:
United States
Language:
English

Citation Formats

Gotchev, O.V., Goncharov, V.N., Knauer, J.P., Boehly, T.R., Collins, T.J.B., Epstein, R., Jaanimagi, P.A., and Meyerhofer, D.D.. Test of Thermal Transport Models through Dynamic Overpressure Stabilization of Ablation-Front Perturbation Growth in Laser-Driven CH Foils. United States: N. p., 2006. Web. doi:10.1103/PhysRevLett.96.115005.
Gotchev, O.V., Goncharov, V.N., Knauer, J.P., Boehly, T.R., Collins, T.J.B., Epstein, R., Jaanimagi, P.A., & Meyerhofer, D.D.. Test of Thermal Transport Models through Dynamic Overpressure Stabilization of Ablation-Front Perturbation Growth in Laser-Driven CH Foils. United States. doi:10.1103/PhysRevLett.96.115005.
Gotchev, O.V., Goncharov, V.N., Knauer, J.P., Boehly, T.R., Collins, T.J.B., Epstein, R., Jaanimagi, P.A., and Meyerhofer, D.D.. Fri . "Test of Thermal Transport Models through Dynamic Overpressure Stabilization of Ablation-Front Perturbation Growth in Laser-Driven CH Foils". United States. doi:10.1103/PhysRevLett.96.115005.
@article{osti_878460,
title = {Test of Thermal Transport Models through Dynamic Overpressure Stabilization of Ablation-Front Perturbation Growth in Laser-Driven CH Foils},
author = {Gotchev, O.V. and Goncharov, V.N. and Knauer, J.P. and Boehly, T.R. and Collins, T.J.B. and Epstein, R. and Jaanimagi, P.A. and Meyerhofer, D.D.},
abstractNote = {Heat-flow-induced dynamic overpressure at the perturbed ablation front of an ICF target can stabilize the ablative Richtmyer/Meshkov-like instability and mitigate the subsequent ablative Rayleigh/Taylor (RT) instability. A series of experiments was performed on the OMEGA laser to quantify the dynamic overpressure stabilization during the shock transit. Analysis of the experimental data using hydrocode simulations shows that the observed oscillatory evolution of the ablation-front perturbations depends on Dc, the size of the thermal conduction zone, and the fluid velocity in the blowoff region Vbl that are sensitive to the thermal transport model used. We show that the simulations match the experiment well when the time dependence of the heat-flux inhibition is taken into account using a recently developed nonlocal heat transport model.},
doi = {10.1103/PhysRevLett.96.115005},
journal = {Physical Review Letters},
number = ,
volume = 96,
place = {United States},
year = {Fri Mar 24 00:00:00 EST 2006},
month = {Fri Mar 24 00:00:00 EST 2006}
}