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Nonlinear stage in the development of hydrodynamic instability in laser targets

Published online by Cambridge University Press:  09 March 2009

E. G. Gamaly
Affiliation:
Lebedev Physics Institute, Academy of Sciences of the USSR, Moscow
I. G. Lebo
Affiliation:
Lebedev Physics Institute, Academy of Sciences of the USSR, Moscow
V. B. Rozanov
Affiliation:
Lebedev Physics Institute, Academy of Sciences of the USSR, Moscow
A. P. Favorsky
Affiliation:
Keldysh Institute of Applied Mathematics, Academy of Sciences of the USSR, Moscow
A. O. Fedyanin
Affiliation:
Keldysh Institute of Applied Mathematics, Academy of Sciences of the USSR, Moscow
E. E. Myshetskaya
Affiliation:
Keldysh Institute of Applied Mathematics, Academy of Sciences of the USSR, Moscow
V. F. Tishkin
Affiliation:
Keldysh Institute of Applied Mathematics, Academy of Sciences of the USSR, Moscow

Abstract

The development of a hydrodynamic instability in laser targets is studied by means of a 2-D numerical code “ATLANT”. During the linear stage, the perturbations grow as:

In the nonlinear stage the growth rate of the Rayleigh-Taylor instability is reduced, and new harmonics are generated. The effect of the nonuniformity of the laser irradiation has been investigated for long-wave and short-wave perturbations. The growth rate of short-wave perturbations may be effectively decreased by means of symmetrical pre-pulses.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1990

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