Search

Your search keyword '"Tomasini M"' showing total 6 results
Start Over Author "Tomasini M" Topic iron
6 results on '"Tomasini M"'

1. Experimental Study of Laser Shock-Released States of Iron into a LiF Window.

Author

Huser, G., Benuzzi-Mounaix, A., Koenig, M., Faral, B., Grandjouan, N., Henry, E., Vinci, T., Batani, D., Tomasini, M., Telaro, B., and Guyot, F.

Subjects
IRON, NATIVE element minerals, LASERS, OPTOELECTRONIC devices, PRESSURE gages, PRESSURE measurement instruments, GAGES, MEASUREMENT
Abstract

Knowledge of iron melting line at multimegabar pressures is fundamental for understanding the Earth’s interior. A high power laser is used to generate multimegabar shockwaves in iron. Pressure-temperature points measurements are performed are performed by studying partially released states of iron into a transparent lithium fluoride (LiF) window. The Fe/LiF interface velocity serves as a pressure gauge while optical radiation through the window is fitted to a grey body function in order to deduce temperature. The shock pressure and temperature of the decaying shock are time-resolved using respectively VISAR and self-emission diagnostics. Experimental results are presented and compared to recent ab initio molecular dynamics calculations and previous experimental results. We find a range of melting pressures in good agreement with theoretical predictions. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2004
Full Text
View/download PDF

2. Experimental Study of Highly Compressed Iron Using Laser Driven Shocks.

Author

Benuzzi-Mounaix, A., Huser, G., Koenig, M., Faral, B., Grandjouan, N., Batani, D., Henry, E., Tomasini, M., Marchet, B., Hall, T., Boustie, M., De Resse´guier, Th., Hallouin, M., and Guyot, F.

Subjects
IRON, CONDENSED matter, MECHANICAL shock
Abstract

Experiments with lasers have recently provided important improvements in our knowledge of highly compressed matter (in particular, Equation Of State). We present recent results on iron which are relevant to planetary physics. We measured the free surface velocity of the compressed iron by using a VISAR diagnostic, and the shock velocity through step targets on the same shot. An absolute EOS is then deduced for pressures 1-7 Mbar. The experiments have been performed at the LULl laboratory of the Ecole Polytechnique. [ABSTRACT FROM AUTHOR]

Published
2002

3. Temperature and melting of laser-shocked iron releasing into an LiF window.

Author

Huser, G., Koenig, M., Benuzzi-Mounaix, A., Henry, E., Vinci, T., Faral, B., Tomasini, M., Telaro, B., and Batani, D.

Subjects
PLASMA lasers, NUCLEAR fusion, ELECTRON emission, IRON, BOUNDARY layer (Aerodynamics), FLUID dynamics, LASER interferometers
Abstract

Absolute reflectivity and self-emission diagnostics are used to determine the gray-body equivalent temperature of laser-shocked iron partially releasing into a lithium fluoride window. Pressure and reflectivity are measured simultaneously by means of velocity interferometer system for any reflector interferometers. In the temperature-pressure plane, a temperature plateau in the release is observed which is attributed to iron’s melting line. Extrapolation of data leads to a melting temperature at Earth’s inner-outer core boundary of 7800±1200 K, in good agreement with previous works based on dynamic compression. Shock temperatures were calculated and found to be in the liquid phase. [ABSTRACT FROM AUTHOR]

Published
2005
Full Text
View/download PDF

4. Interface velocity of laser shocked Fe/LiF targets.

Author

Huser, G., Koenig, M., Benuzzi-Mounaix, A., Henry, E., Vinci, T., Faral, B., Tomasini, M., Telaro, B., and Batani, D.

Subjects
TARGETS (Nuclear physics), LASERS, IRON, LITHIUM compounds, HYDRODYNAMICS, REFRACTIVE index
Abstract

The interface velocity of iron partially releasing into a lithium fluoride (LiF) window has been measured using VISAR technique. Corrections to the fringe-per-velocity relationship are presented. A good agreement with hydrodynamic simulations is found at laser intensities <2×1013 W/cm2. For higher intensities, velocities appear to be lower than the numerical predictions. A strong modification of compressed LiF index of refraction behavior might explain such a discrepancy. [ABSTRACT FROM AUTHOR]

Published
2004
Full Text
View/download PDF

5. Absolute equation of state measurements of iron using laser driven shocks.

Author

Benuzzi-Mounaix, A., Koenig, M., Huser, G., Faral, B., Batani, D., Henry, E., Tomasini, M., Marchet, B., Hall, T. A., Boustie, M., De Resse´guier, Th., Hallouin, M., Guyot, F., Andrault, D., and Charpin, Th.

Subjects
SHOCK waves, IRON, GEOMETRIC surfaces
Abstract

First absolute equation of state measurements obtained for iron with laser driven shock waves are presented. The shock velocity and the free surface velocity of compressed iron have been simultaneously measured by using a VISAR diagnostic, and step targets. The pressure range 1-8 Mbar has been investigated, which is directly relevant to planetary physics. The experiments have been performed at the Laboratoire pour l'Utilisation des Lasers Intenses of the Ecole Polytechnique. [ABSTRACT FROM AUTHOR]

Published
2002
Full Text
View/download PDF

6. Equation of state data for iron at pressures beyond 10 Mbar

Author

M. Koenig, C. Reverdin, Peter M. Celliers, L. B. Da Silva, B. Marchet, Alessandra Benuzzi-Mounaix, A. Morelli, F. Philippe, P. Baclet, M. Tomasini, M. Moret, Dimitri Batani, R. C. Cauble, B. Sacchi, B. Cathala, M. Rabec, Todd H. Hall, Gilbert Collins, I. Masclet, Batani, D, Morelli, A, Tomasini, M, Benuzzi Mounaix, A, Philippe, F, Koenig, M, Marchet, B, Masclet, I, Rabec, M, Reverdin, C, Cauble, R, Celliers, P, Collins, G, Da Silva, L, Hall, T, Moret, M, Sacchi, B, Baclet, P, and Cathala, B

Subjects
Shock wave, Physics, Equation of state, Kinoform, Phase (waves), General Physics and Astronomy, High energy laser, Plasma, Electromagnetic radiation, Computational physics, laser, Pressure range, high pressure, iron, Statistical physics, equation of state, FIS/03 - FISICA DELLA MATERIA
Abstract

We present equation of state points for iron, in the pressure range 10-45 Mbar, the first obtained with laser-driven shock waves. The experiment has been performed with the high energy laser Phebus, optically smoothed with Kinoform phase plates. Our results double the set of existing experimental data at very high pressures showing good agreement with the predictions of the quotidian equation of state model and with previous results.

Published
2002

Catalog

Books, media, physical & digital resources
See catalog results