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Implosion symmetry of laser-irradiated cylindrical targets

Published online by Cambridge University Press:  22 April 2008

R. Ramis ,
J. Ramírez  and
G. Schurtz
R. Ramis*
Affiliation:
E.T.S.I. Aeronáuticos, Universidad Politécnica de Madrid, Madrid, Spain
J. Ramírez
Affiliation:
E.T.S.I. Aeronáuticos, Universidad Politécnica de Madrid, Madrid, Spain
G. Schurtz
Affiliation:
CELIA, Université Bordeaux, Bordeaux, France
*
Address correspondence and reprint requests to: R. Ramis, E.T.S.I. Aeronáuticos, P. Cardenal Cisneros 3, 28010 Madrid, Spain. E-mail: rafael.ramis@upm.es
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Abstract

We consider the symmetry of cylindrical implosions of laser targets with parameters corresponding to experiments proposed for the LIL laser facility at Bordeaux: eight laser beams in octahedrical configuration, delivering a total of 50 kJ of 0.35 µm laser light in 5 ns, impinging on 1.26 mm diameter polystyrene cylindrical shells filled with deuterium at 30 bar and 5.35 mg cm−3; this configuration allows to place diagnostics along the symmetry axis to evaluate directly the uniformity of implosion. Numerical studies have been carried out by using the hydrodynamic computer codes MULTI and CHIC, including one-dimensional, and two-dimensional R–Z and R–θ simulations. Deuterium is compressed into a 1 mm long and 50 µm diameter filament, with density ranging from 2 to 6 g cm−3 and temperatures above 1000 eV. In spite of the reduced numbers of beams, a good symmetry can be achieved with a careful choice of the irradiation pattern. The heat transport smoothing between laser absorption zone and ablation layer plays a fundamental role in the attenuation of residual non-uniformities. Also, it has been found that the radiation transport determines the radial structure of the compressed filament.

Keywords

Cylindrical targetsHydrodynamic simulationsImplosion symmetryInertial confinement fusionLaser-plasma interaction
Type
Research Article
Information
Laser and Particle Beams , Volume 26 , Issue 1 , March 2008 , pp. 113 - 126
Copyright
Copyright © Cambridge University Press 2008

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