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ICF-related experiments at CEL-V

Published online by Cambridge University Press:  09 March 2009

M. Andre
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
C. Bayer
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
D. Babonneau
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
M. Bernard
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
J. L. Bocher
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
J. Bruneau
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
A. Coudeville
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
J. Coutant
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
R. Dautray
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
A. Decoster
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
M. Decroisette
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
D. Desenne
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
B. Duborgel
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
J. M. Dufour
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
J. P. Jadaud
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
D. Juraszek
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
J. P. Garçonnet
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
P. A. Holstein
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
J. Lachkar
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
M. Louis-Jacquet
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
F. Mucchielli
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
B. Meyer
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
J. P. Lebreton
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
J. Ouvry
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
D. Schirmann
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
G. Schurtz
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
D. Véron
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France
J. P. Watteau
Affiliation:
Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint Georges, Cedex, France

Abstract

Implosion experiments performed at Centre d'Etudes de Limeil-Valenton in the indirect drive scheme using the two-beams Nd:glass laser facility Phebus at the energy level = 6 kJ (blue light) are presented. A final density of compressed DT close to 100 ρ0 has been obtained; it has been deduced from radiochemistry of the activated silicon atoms in the pusher. The best irradiance uniformity on the microballoon was evaluated to = 15% rms. Phebus has also been equipped with an optical fiber oscillator to study the effect of a smoothing technique on coupling processes: It appeared that at 0·53 μm absorption efficiency is increased by =15–20%. With the eight-beams Octal laser, hydrodynamic instabilities development in accelerated planar targets has been investigated both for direct and indirect drives; the mixing zone detected at the light-heavy interface does not present visible bubble-and-spike like structures and is less developed in the indirect configuration. Atomic physics in laser plasmas is also deeply studied; a particular effort has been made on absorption spectroscopy, a powerful diagnostic of ionization dynamics in cold and dense plasmas. Experiments have been realized either in multilayered targets or using rear-side X-ray emission of thin Au foils to heat the samples. To reach fuel ignition conditions, more powerful lasers, in the range of megajoule, will be needed. Their design needs further technological developments to reduce the capital cost in $/W. At Limeil, we work mainly on high-damage threshold optical coatings, using the sol-gel process, high-quality, low-cost mirror fabrication, using the replica technics, and incoherent laser pulse generation for beam smoothing.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1992

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