Study of shock-coalescence on the LIL laser facility
1 CEA, DAM, DIF, 91297 Arpajon, France
2 CEA, DAM, CESTA, 33114 Le Barp, France
3 CEA, DAM, VALDUC, 21120 Is-sur-Tille, France
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Published online: 15 November 2013
We use the LIL (Ligne d'Intégration Laser) facility to study the coalescence of two planar shocks in an indirectly-driven planar sample of polystyrene. This experiment represents the preliminary stage of the future shock-timing campaign for the Laser Megajoule (LMJ). The main objectives are to validate the experimental concept and to test the numerical simulations. We used a gold spherical hohlraum to convert into X-ray the 351 nm wavelength laser pulse and to initiate the two shocks in the sample. To access time resolved shock velocities and temperature, we used two rear-side diagnostics: a VISAR (Velocity Interferometer System for Any Reflection) working at two different wavelengths and a streaked optical self-emission diagnostic. We observed the coalesced shock, in good agreement with the numerical simulations. We also observed a loss of signal during the first nanoseconds probably due to sample heating from the hohlraum X-ray flux.
© Owned by the authors, published by EDP Sciences, 2013
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