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Title: Richtmyer-Meshkov-like instabilities and early-time perturbation growth in laser targets and Z-pinch loads

Abstract

The classical Richtmyer-Meshkov (RM) instability develops when a planar shock wave interacts with a corrugated interface between two different fluids. A larger family of so-called RM-like hydrodynamic interfacial instabilities is discussed. All of these feature a perturbation growth at an interface, which is driven mainly by vorticity, either initially deposited at the interface or supplied by external sources. The inertial confinement fusion relevant physical conditions that give rise to the RM-like instabilities range from the early-time phase of conventional ablative laser acceleration to collisions of plasma shells (like components of nested-wire-arrays, double-gas-puff Z-pinch loads, supernovae ejecta and interstellar gas). In the laser ablation case, numerous additional factors are involved: the mass flow through the front, thermal conduction in the corona, and an external perturbation drive (laser imprint), which leads to a full stabilization of perturbation growth. In contrast with the classical RM case, mass perturbations can exhibit decaying oscillations rather than a linear growth. It is shown how the early-time perturbation behavior could be controlled by tailoring the density profile of a laser target or a Z-pinch load, to diminish the total mass perturbation seed for the Rayleigh-Taylor instability development. (c) 2000 American Institute of Physics.

Authors:
 [1];  [1];  [1];  [2];  [2];  [3];  [3];  [4];  [5];  [6]
  1. Plasma Physics Division, Naval Research Laboratory, Washington, D.C. 20375 (United States)
  2. Laboratory for Computational Physics and Fluid Dynamics, Naval Research Laboratory, Washington, D.C. 20375 (United States)
  3. Berkeley Research Associates, Incorporated, Springfield, Virginia 22150 (United States)
  4. Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
  5. Physics Department, Nuclear Research Center Negev, P. O. Box 9001, Beer Sheva, Israel, (Israel)
  6. (United States)
Publication Date:
OSTI Identifier:
20216040
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 7; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; PERTURBATION THEORY; LASER TARGETS; LINEAR Z PINCH DEVICES; SHOCK WAVES; PLASMA INSTABILITY; HYDRODYNAMICS; LASER FUSION REACTORS; EXPERIMENTAL DATA; THEORETICAL DATA

Citation Formats

Velikovich, A. L., Dahlburg, J. P., Schmitt, A. J., Gardner, J. H., Phillips, L., Cochran, F. L., Chong, Y. K., Dimonte, G., Metzler, N., and Science Applications International Corporation, McLean, Virginia 22150. Richtmyer-Meshkov-like instabilities and early-time perturbation growth in laser targets and Z-pinch loads. United States: N. p., 2000. Web. doi:10.1063/1.873986.
Velikovich, A. L., Dahlburg, J. P., Schmitt, A. J., Gardner, J. H., Phillips, L., Cochran, F. L., Chong, Y. K., Dimonte, G., Metzler, N., & Science Applications International Corporation, McLean, Virginia 22150. Richtmyer-Meshkov-like instabilities and early-time perturbation growth in laser targets and Z-pinch loads. United States. doi:10.1063/1.873986.
Velikovich, A. L., Dahlburg, J. P., Schmitt, A. J., Gardner, J. H., Phillips, L., Cochran, F. L., Chong, Y. K., Dimonte, G., Metzler, N., and Science Applications International Corporation, McLean, Virginia 22150. Mon . "Richtmyer-Meshkov-like instabilities and early-time perturbation growth in laser targets and Z-pinch loads". United States. doi:10.1063/1.873986.
@article{osti_20216040,
title = {Richtmyer-Meshkov-like instabilities and early-time perturbation growth in laser targets and Z-pinch loads},
author = {Velikovich, A. L. and Dahlburg, J. P. and Schmitt, A. J. and Gardner, J. H. and Phillips, L. and Cochran, F. L. and Chong, Y. K. and Dimonte, G. and Metzler, N. and Science Applications International Corporation, McLean, Virginia 22150},
abstractNote = {The classical Richtmyer-Meshkov (RM) instability develops when a planar shock wave interacts with a corrugated interface between two different fluids. A larger family of so-called RM-like hydrodynamic interfacial instabilities is discussed. All of these feature a perturbation growth at an interface, which is driven mainly by vorticity, either initially deposited at the interface or supplied by external sources. The inertial confinement fusion relevant physical conditions that give rise to the RM-like instabilities range from the early-time phase of conventional ablative laser acceleration to collisions of plasma shells (like components of nested-wire-arrays, double-gas-puff Z-pinch loads, supernovae ejecta and interstellar gas). In the laser ablation case, numerous additional factors are involved: the mass flow through the front, thermal conduction in the corona, and an external perturbation drive (laser imprint), which leads to a full stabilization of perturbation growth. In contrast with the classical RM case, mass perturbations can exhibit decaying oscillations rather than a linear growth. It is shown how the early-time perturbation behavior could be controlled by tailoring the density profile of a laser target or a Z-pinch load, to diminish the total mass perturbation seed for the Rayleigh-Taylor instability development. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.873986},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 7,
place = {United States},
year = {2000},
month = {5}
}