Direct laser-driven ramp compression studies of iron: A first step toward the reproduction of planetary core conditions |
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Authors: | N. Amadou E. Brambrink A. Benuzzi-Mounaix G. Huser F. Guyot S. Mazevet G. Morard T. de Resseguier T. Vinci K. Myanishi N. Ozaki R. Kodama T. Boehly O. Henry D. Raffestin M. Koenig |
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Affiliation: | 1. LULI, Ecole Polytechnique, CNRS, CEA, UPMC, Route de Saclay, 91128 Palaiseau, France;2. CEA, Bruyre-le-châtel, France;3. IMPMC, IPGP, UDD, UMPC, Paris, France;4. Observatoire de Paris, Meudon, France;5. IMPMC, UMPC, Paris, France;6. Institut Pprime, ENSMA, Poitiers, France;7. Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan;8. Laboratory for Laser Energetics, University of Rochester, Rochester, USA;9. CEA Cesta, Le Barp, France |
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Abstract: | The study of iron under quasi-isentropic compression using high energy lasers, might allow to understand its thermodynamical properties, in particular its melting line in conditions of pressure and temperature relevant to Earth-like planetary cores (330–1500 GPa, 5000–8000 K). However, the iron alpha-epsilon solid–solid phase transition at 13 GPa favors shock formation during the quasi-isentropic compression process which can depart from the appropriate thermodynamical path. Understanding this shock formation mechanism is a key issue for being able to reproduce Earth-like planetary core conditions in the laboratory by ramp compression. In this article, we will present recent results of direct laser-driven quasi-isentropic compression experiments on iron samples obtained on the LULI 2000 and LIL laser facilities. |
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