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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 inertial confinement fusion 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 D{sub c}, the size of the thermal conduction zone, and the fluid velocity in the blowoff region V{sub bl} 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 [V. N. Goncharov et al., Phys. Plasmas 13, 012702 (2006)].

Authors:
; ; ; ; ; ; ;  [1]
  1. Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623 (United States)
Publication Date:
OSTI Identifier:
20778832
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 96; Journal Issue: 11; Other Information: DOI: 10.1103/PhysRevLett.96.115005; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ABLATION; BLOWOFF; EXPERIMENTAL DATA; FOILS; HEAT FLUX; INERTIAL CONFINEMENT; LASERS; PLASMA; PLASMA DIAGNOSTICS; PLASMA PRODUCTION; PLASMA SIMULATION; PLASMA WAVES; RAYLEIGH-TAYLOR INSTABILITY; SHOCK WAVES; STABILIZATION; THERMAL CONDUCTION; TIME DEPENDENCE; TRANSPORT THEORY

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.96.1.
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. https://doi.org/10.1103/PHYSREVLETT.96.1
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. 2006. "Test of Thermal Transport Models through Dynamic Overpressure Stabilization of Ablation-Front Perturbation Growth in Laser-Driven CH Foils". United States. https://doi.org/10.1103/PHYSREVLETT.96.1.
@article{osti_20778832,
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 inertial confinement fusion 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 D{sub c}, the size of the thermal conduction zone, and the fluid velocity in the blowoff region V{sub bl} 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 [V. N. Goncharov et al., Phys. Plasmas 13, 012702 (2006)].},
doi = {10.1103/PHYSREVLETT.96.1},
url = {https://www.osti.gov/biblio/20778832}, journal = {Physical Review Letters},
issn = {0031-9007},
number = 11,
volume = 96,
place = {United States},
year = {Fri Mar 24 00:00:00 EST 2006},
month = {Fri Mar 24 00:00:00 EST 2006}
}