Flyer acceleration experiments are carried out using a KrF
laser system with a pulse duration of 10–15 ns and an
intensity of ∼1.0 × 1013 W/cm2.
Three-layered targets (aluminum–polyimide–tantalum)
are used. First, an average velocity of laser-driven tantalum
flyers with a thickness of 4 and 8 μm is estimated. Then,
in a collision of a flyer with a copper layer attached to a
diamond plate, we measure a transit time of a shock wave in
the diamond. The impact velocity is estimated based on the transit
time and a numerical simulation. This numerical simulation also
shows that the initial peak pressure caused by the impact of
a 4-μm-thick flyer is kept at 11 Mbar for 12–13 μm
in thickness. Finally, whether this thickness is enough for
EOS measurements is discussed.