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Effect of the laser intensity profile on the shock non-uniformity in a directly driven spherical target

Published online by Cambridge University Press:  29 July 2015

Mauro Temporal ,
Benoit Canaud ,
Warren J. Garbett  and
Rafael Ramis
Mauro Temporal*
Affiliation:
Centre de Mathématiques et de Leurs Applications, ENS Cachan and CNRS, 61 Av. du President Wilson, F-94235 Cachan CEDEX, France
Benoit Canaud
Affiliation:
CEA, DIF, F-91297 Arpajon CEDEX, France
Warren J. Garbett
Affiliation:
AWE plc, Aldermaston, Reading, Berkshire RG7 4PR, UK
Rafael Ramis
Affiliation:
ETSI Aeronáutica y del Espacio, Universidad Politécnica de Madrid, 28040 Madrid, Spain
*
†Email address for correspondence: [email protected]
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Abstract

An axially symmetric laser beam configuration irradiating a spherical capsule has been considered in the context of inertial confinement fusion (ICF). The laser beams are located at co-latitudes 49° and 131° and mimic the quad positions in the second cone of the Laser Mégajoule Facility. The capsule is directly irradiated by the laser beams whose energy deposition generates a nearly spherical shock wave. Two-dimensional hydrodynamic numerical simulations have been performed to analyse the non-uniformity of the shock wavefront launched inward throughout the target. Different laser intensity profiles, calculated by the illumination model, have been tested. The performance, in terms of shock non-uniformity, has been compared, and it is found that with an appropriate choice of the laser intensity profile it is possible to control the shock non-uniformity at early times.

Type
Research Article
Information
Journal of Plasma Physics , Volume 81 , Issue 5 , October 2015 , 905810514
Copyright
© Cambridge University Press 2015 

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