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Effect of convergence on growth of the Richtmyer-Meshkov instability

Published online by Cambridge University Press:  02 June 2005

J.R. FINCKE ,
N.E. LANIER ,
S.H. BATHA ,
R.M. HUECKSTAEDT ,
G.R. MAGELSSEN ,
S.D. ROTHMAN ,
K.W. PARKER  and
C.J. HORSFIELD
J.R. FINCKE
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
N.E. LANIER
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
S.H. BATHA
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
R.M. HUECKSTAEDT
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
G.R. MAGELSSEN
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
S.D. ROTHMAN
Affiliation:
AWE Aldermaston, United Kingdom
K.W. PARKER
Affiliation:
AWE Aldermaston, United Kingdom
C.J. HORSFIELD
Affiliation:
AWE Aldermaston, United Kingdom
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Abstract

Strongly shocked cylindrically convergent implosions were conducted on the OMEGA laser. The directly driven targets consist of a low-density foam core and an embedded aluminum shell covered by an epoxy ablator. The outer surface of the aluminum shell has imposed single-mode perturbations with wave numbers k = 0.25, 0.7, 1.05, and 2.5 (rad/μm) and initial amplitudes η0 /λ = 0.04, 0.11, 0.33, and 0.4. In our convergent geometry, perturbation growth without evidence of saturation, for η/λ as large as 4.5 is observed for k < 1. For k > 1 growth rate scaling with wavenumber breaks down and transition to turbulence is suggested.

Keywords

ICFImplosionInstabilityRichtmyer-Meshkov
Type
Research Article
Information
Laser and Particle Beams , Volume 23 , Issue 1 , March 2005 , pp. 21 - 25
Copyright
2005 Cambridge University Press

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