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10-ps pulsation of laser plasma explained hydrodynamically by self-generated Bragg ripples and their decay and avoidance by smoothing

Published online by Cambridge University Press:  09 March 2009

M. Aydin ,
Gu Min  and
H. Hora
M. Aydin
Affiliation:
Department of Theoretical Physics, University of New South Wales, Kensington 2033, Australia
Gu Min
Affiliation:
Department of Theoretical Physics, University of New South Wales, Kensington 2033, Australia
H. Hora
Affiliation:
Department of Theoretical Physics, University of New South Wales, Kensington 2033, Australia
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Abstract

The many years' of difficulty with laser fusion owing to the complexity of the interaction with the plasma has been clarified experimentally from the 10-ps pulsation of the interaction. The theoretical understanding of this pulsation is presented here from a hydrodynamic simulation of the interaction in which the generation of partial standing waves and the subsequent nonlinear-force-produced density ripple produces ideal Bragg reflection in the outermost part of the plasma. This all decays within about 10 ps hydrodynamically. The theory explains immediately why the 2-ps coherence at induced spatial incoherence avoids the pulsation and arrives at a smooth interaction similar to the random-phase plate or the use of broad-band laser spectrum irradiation.

Type
Research Article
Information
Laser and Particle Beams , Volume 10 , Issue 1 , March 1992 , pp. 155 - 162
Copyright
Copyright © Cambridge University Press 1992

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