Abstract Details
Simulating Earth Core using High Energy Lasers
Author: Michel Koenig
Requested Type: Oral Only
Submitted: 2009-04-09 02:59:16
Co-authors: M. Koenig1, T. Vinci2, S. Mazevet2, E. Brambrink1, G. Wei1,3,4, B. Barbrel1, 2, A. Benuzzi-Mounaix1, C. Gregory1, F. Guyot5, G. Morard5, N. Ozaki6, T. Kimura6, K. Miyanishi6, T. Endo6, R. Kodama6, T.Boehly7, H.-S. Park8
Contact Info:
Laboratoire LULI
Ecole Polytechnique
palaiseau, IdF 91128
FRANCE
Abstract Text:
1 Laboratoire pour l’Utilisation des Lasers Intenses (LULI) Unité Mixte n 7605 CNRS - CEA - Ecole Polytechnique - Université Pierre et Marie Curie, Palaiseau, France
2 Département de Physique Théorique et Appliquée, CEA/DAM, Bruyères-le-Châtel, France
3 Shandong university, Jinan, China
4 National astronomical observatories, Chinese Academy of science, Beijing China
5 Laboratoire de Minéralogie et Cristallographie, IMPMC Bâtiment 7. 140 rue de Lourmel. 75005 Paris, France
6 Graduate school of engineering, Osaka university, Suita, Osaka 565-0871, Japan
7 Laboratory for Laser Energetics, University of Rochester, Rochester, USA
8 Lawrence Livermore National Laboratory, Livermore, California USA 94551-0808 USA
The melting curve and EOS of iron or iron alloys at the inner core boundary (330 GPa, about 5000 K) are still unknown which severally limits current earth modelling. In order to answer partly to these issues, the French National Research Agency supported a program grouping several laboratories including geophysicists. In this presentation I will present recent work done within this project.
This will concern recent numerical and experimental studies done on laser generated isentropic ramp compression in iron and aluminum. For the calculations, a ramp (similar to the actial one) is injected in molecular dynamic simulations to study the time evolution of the atomic structure of materials under strong stress on the same longitudinal and temporal scales as the experiment. On the experimental side, recent experiments done at LULI using the both reservoir technique and direct laser ramp will be discussed.
Finally short-pulse laser-generated hard x-ray (18-60 keV) sources, suitable to radiograph large samples of shock compressed iron will be shown. The spatial and dynamic resolutions for various target types and laser parameters have been investigated. High quality radiographs were obtained by irradiating thin W wires. Application of the x-ray source to the density measurement of shocked iron is finally presented.
Comments: