We present some preliminary results on the equation of
state (EOS) of water in a pressure regime of astrophysical
interest. In the experiments, structured targets made of
an aluminum step followed by a water layer are irradiated
by the laser at an intensity up to 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 self-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.