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Flyer acceleration experiments using a KrF laser system with a long pulse duration and pressure and thickness of isobaric zone induced in impacted materials

  • T. KADONO (a1), M. YOSHIDA (a1), N.K. MITANI (a1), T. MATSUMURA (a1), E. TAKAHASHI (a2), I. MATSUSHIMA (a2), Y. OWADANO (a2), Y. SASATANI (a3) (a4), K. FUJITA (a3) (a4), N. OZAKI (a3) (a4), K. TAKAMATSU (a3) (a4), M. NAKANO (a3) (a4), K.A. TANAKA (a3) (a4), H. TAKENAKA (a5), H. ITO (a5) and K. KONDO (a6)...


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.


Corresponding author

Address correspondence and reprint requests to: Toshihiko Kadono, Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo 113-0032, Japan. E-mail:



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