High Power Laser Science and Engineering, 2014, 2 (4): 04000e37, Published Online: Jan. 13, 2015  

Optimal laser intensity profiles for a uniform target illumination in direct-drive inertial confinement fusion Download: 688次

Author Affiliations
1 Centre de Mathematiques et de Leurs Applications, ENS Cachan and CNRS, 61 Av. du President Wilson, F-94235 Cachan Cedex, France
2 CEA, DIF, F-91297, Arpajon Cedex, France
3 AWE plc, Aldermaston, Reading, Berkshire RG7 4PR, United Kingdom
4 ETSI Aeronauticos, Universidad Politecnica de Madrid, 28040 Madrid, Spain
Abstract
A numerical method providing the optimal laser intensity profiles for a direct-drive inertial confinement fusion scheme has been developed. The method provides an alternative approach to phase-space optimization studies, which can prove computationally expensive. The method applies to a generic irradiation configuration characterized by an arbitrary number NB of laser beams provided that they irradiate the whole target surface, and thus goes beyond previous analyses limited to symmetric configurations. The calculated laser intensity profiles optimize the illumination of a spherical target. This paper focuses on description of the method, which uses two steps: first, the target irradiation is calculated for initial trial laser intensities, and then in a second step the optimal laser intensities are obtained by correcting the trial intensities using the calculated illumination. A limited number of example applications to direct drive on the Laser MegaJoule (LMJ) are described.

Mauro Temporal1, Benoit Canaud2, Warren J. Garbett3, Rafael Ramis4. Optimal laser intensity profiles for a uniform target illumination in direct-drive inertial confinement fusion[J]. High Power Laser Science and Engineering, 2014, 2(4): 04000e37.

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