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Comparison between illumination model and hydrodynamic simulation for a direct drive laser irradiated target

Published online by Cambridge University Press:  12 September 2014

M. Temporal ,
B. Canaud ,
W.J. Garbett  and
R. Ramis
M. Temporal*
Affiliation:
Centre de Mathématiques et de Leurs Applications, ENS Cachan and CNRS, Cachan Cedex, France
B. Canaud
Affiliation:
CEA, DIF, Arpajon Cedex, France
W.J. Garbett
Affiliation:
AWE plc, Aldermaston, Reading, Berkshire, United Kingdom
R. Ramis
Affiliation:
ETSI Aeronáuticos, Universidad Politécnica de Madrid, Madrid, Spain
*
Address correspondence and reprint requests to: M. Temporal, Centre de Mathématiques et de Leurs Applications, ENS Cachan and CNRS, 61 Av. du President Wilson, F-94235 Cachan Cedex, France. E-mail: [email protected]
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Abstract

A spherical target irradiated by laser beams located at 49o and 131° with respect to the polar axis has been considered. The illumination model has been used to evaluate the irradiation non-uniformity assuming circular and elliptical super-Gaussian laser intensity profiles and the irradiation scheme has been optimized by means of the polar direct drive technique. A parametric study has been performed providing the irradiation non-uniformity as a function of the polar direct drive displacement and of the laser intensity profile parameters. Moreover, two-dimensional axis-symmetric hydrodynamic simulations have been performed for a plastic sphere irradiated by laser beams characterized by a constant flat temporal power pulse. In these simulations, the front of the inward shock wave has been tracked providing the time-evolution of any non-uniformity. The results provided by the two methods — illumination model and hydrodynamic data — have been compared and it is found that the illumination model reproduces the main behavior exhibited by the hydrodynamic data. The two models provide compatible values for the optimum polar direct drive parameter and similar optimal super-Gaussian profiles.

Keywords

Direct-drive fusionInertial confinement fusionIrradiation uniformity
Type
Research Article
Information
Laser and Particle Beams , Volume 32 , Issue 4 , December 2014 , pp. 549 - 556
Copyright
Copyright © Cambridge University Press 2014 

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