Preliminary results on the EOS of water in the megabar range

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

doi:10.1117/12.425549

23 April 2001 Preliminary results on the EOS of water in the megabar range

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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Proceedings Volume 4424, ECLIM 2000: 26th European Conference on Laser Interaction with Matter; (2001) https://doi.org/10.1117/12.425549
Event: 26th European Conference on Laser Interaction with Matter (ECLIM 2000), 2000, Prague, Czech Republic

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.

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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, and C. Cavazzoni "Preliminary results on the EOS of water in the megabar range", Proc. SPIE 4424, ECLIM 2000: 26th European Conference on Laser Interaction with Matter, (23 April 2001); https://doi.org/10.1117/12.425549

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KEYWORDS

Aluminum

Velocity measurements

Reflectivity

Water

Laser beam diagnostics

Magnetism

Streak cameras

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