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LULI2000 - Applications of the analogy between ns‐laser shock and hypervelocity impact for space challenges (D. Loison)

This proposal aims at developing kJ/ns laser shocks for studying materials under very high velocity impact. While high velocity impacts are important phenomena in the universe (meteorite impact, planetary accretion) and are of utmost importance for aeronautic application, very little is known on their effect on material, mechanical chemical and physical properties. This lack of knowledge calls for systematic studies with well-controlled parameters. In that context, laboratory experiments propose unique opportunities. Here our proposal focuses on exploring the analogy principle of laser plasma shocks with very high velocity impact through mechanical, physical and chemical measurements..The experimental set-up couples high speed shadowgraphy imaging, heterodyne velocimetry, line VISAR and soft recovery of both ejecta and sample. Materials will be chosen for their potential use as shield in space applications (aluminum, bulk metallic glasses) and for geoscience and planetology issues such as meteorite and planetesimal minerals (fused silica, basalt, hydrated minerals). Cross analysis between in-situ dynamic diagnostic and post-shock material characterization will allow increasing knowledge about laser matter interaction to complete the analogy between ns-laser shock and hypervelocity impact. We will also ensure a close comparison with predictive code on material behavior under high velocity impacts. Results will demonstrate the interest of kJ/ns laser as unique facility to study material under extreme impacts in relation with international aeronautical and spatial missions (Hera project, Hayabusa2). This proposal is supported by preliminary studies on low laser energy facilities (GCLT, Hephaistos and Elfie) as well as previous experiments on LULI2000 in 2013 and 2017. Diagnostics will be brought and performed by IPR, PIMM, CEA and LULI. Materials will be manufactured and analyzed by IPR, CEMEF, IMPMC, OCA.

LULI2000 - S37-S38/2020