Etude expérimentale du séquencement des chocs pour la Fusion par Confinement Inertiel

Abstract : The Laser Mégajoule (LMJ), which should achieve energy gain in an indirect drive inertial confinement fusion configuration, is being built in France by the CEA (Commissariat à l'Energie Atomique et aux Energies Alternatives). To achieve thermonuclear ignition, the compression of a spherical target will have to be controlled by a series of accurately timed centripetal shocks, with a finely tuned level. A first experiment, performed in 2010 on the LIL (Ligne d'Intégration Laser) facility at CEA, has allowed us to study the coalescence of two planar shocks in an indirectly-driven sample of polystyrene, within the framework of shock timing. The main objectives were to validate the experimental concept and the numerical simulations, as a proof-of-principle for future shock-timing campaigns. The main diagnostics used for this study are VISAR (Velocity Interferometer System for Any Reflection) and an optical shock breakout diagnostic, taking into account optical perturbations caused by X-rays. In another experiment, conducted on the LULI (Laboratoire pour l'Utilisation des Lasers Intenses) laser facility in 2010, we studied the timing of two planar directly-driven shocks using the same diagnostics. This latter study is related to the shock ignition concept, with the long-term perspective of energy production. This thesis presents these two experiments and their results.
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Contributor : Grégoire Debras <>
Submitted on : Saturday, July 7, 2012 - 1:03:04 PM
Last modification on : Monday, October 15, 2018 - 3:46:02 PM
Long-term archiving on : Monday, October 8, 2012 - 2:20:50 AM

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Grégoire Debras. Etude expérimentale du séquencement des chocs pour la Fusion par Confinement Inertiel. Physique Nucléaire Expérimentale [nucl-ex]. Ecole Polytechnique X, 2012. Français. ⟨pastel-00715451⟩

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