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Proceedings Paper

Preliminary results on the EOS of water in the megabar range
Author(s): Eugene A. Henry; Dimitri Batani; A. Morelli; M. Bernasconi; Michel Koenig; A. Benuzzi-Mounaix; I. Masclet; B. Marchet; M. Rebec; Charles Reverdin; Peter M. Celliers; Luiz Barroca Da Silva; Robert C. Cauble; G. Collins; T. Hall; C. Cavazzoni
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Paper Abstract

In recent years, shock waves driven by high power lasers have become a reliable tool for the study of the equation of state (EOS) of material sin the Megabar pressure range, where they become strongly correlated, degenerate, dense plasmas. The EOS of water at very high pressures plays a very important role in astrophysics. In particular, the large magnetic field measured on Uranus and Neptune by Voyager 2 is assumed to be generated in the 'ice' layers where pressures up to 6 Mbar are reached. Recent calculations predict an insulator-metallic phase transition of water in this regime. Here, we present some preliminary results form a recent experiment on water EOS performed with the laser PHEBUS and funded by the European Union in the framework of the 'Access to Large Scale Facilities' program. In the experiment, structured targets made of an Aluminium step followed by a water layer are irradiated by the laser at an intensity approximately equals 4.1014 W.cm-2 to generate a shock wave. Velocities are measured in the two materials using a VISAR interferometric diagnostic for water, and a streak camera to measure target emission for Al. EOS points for water are obtained with the impedance mismatch method using Al EOS as a reference. Water reflectivity was also measured.

Paper Details

Date Published: 23 April 2001
PDF: 4 pages
Proc. SPIE 4424, ECLIM 2000: 26th European Conference on Laser Interaction with Matter, (23 April 2001); doi: 10.1117/12.425549
Show Author Affiliations
Eugene A. Henry, Univ. degli Studi di Milano-Bicocca and INFM (United States)
Dimitri Batani, Univ. degli Studi di Milano-Bicocca and INFM (Italy)
A. Morelli, Univ. degli Studi di Milano-Bicocca and INFM (Italy)
M. Bernasconi, Univ. degli Studi di Milano-Bicocca and INFM (Italy)
Michel Koenig, Ecole Polytechnique (France)
A. Benuzzi-Mounaix, Ecole Polytechnique (France)
I. Masclet, CEA Limeil (France)
B. Marchet, CEA Limeil (France)
M. Rebec, CEA Limeil (France)
Charles Reverdin, CEA Limeil (France)
Peter M. Celliers, Lawrence Livermore National Lab. (United States)
Luiz Barroca Da Silva, Lawrence Livermore National Lab. (United States)
Robert C. Cauble, Lawrence Livermore National Lab. (United States)
G. Collins, Lawrence Livermore National Lab. (United States)
T. Hall, Univ. of Essex (United Kingdom)
C. Cavazzoni, CINECA (Italy)


Published in SPIE Proceedings Vol. 4424:
ECLIM 2000: 26th European Conference on Laser Interaction with Matter
Milan Kalal; Karel Rohlena; Milan Sinor, Editor(s)

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