A recently proposed experiment for the absolute measurement of the Equation of State (EOS) of solid materials in the 10-50 Mbar pressure range is analyzed by means of numerical simulations. In the experiment, an intense laser pulse drives a shock wave in a solid target. The shock velocity and the fluid velocity are measured simultaneously by rear side time-resolved imaging and by transverse X-radiography, respectively. An EOS point is then computed by using the Hugoniot equations. The target evolution is simulated by a two-dimensional radiation-hydrodynamics code; ad hoc developed post-processors then generate simulated diagnostic images. The simulations evidence important two-dimensional effects, related to the finite size of the laser spot and to lateral plasma expansion. The first one may hinder detection of the fluid motion, the second results in a decrease of the shock velocity with time (for constant intensity laser pulses). A target design is proposed which allows for the accurate measurement of the fluid velocity; the variation of the shock velocity can be limited by the choice of a suitably time-shaped laser pulse. © Società Italiana di Fisica.
|Pages (from-to)||1839 - 1851|
|Number of pages||13|
|Journal||Nuovo Cimento della Societa Italiana di Fisica D - Condensed Matter, Atomic, Molecular and Chemical Physics, Biophysics|
|Publication status||Published - 1997|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
Temporal, M., Atzeni, S., Batani, D., Koenig, M., Benuzzi, A., & Faral, B. (1997). Numerical simulations for the design of absolute equation-of-state measurements by laser-driven shock waves. Nuovo Cimento della Societa Italiana di Fisica D - Condensed Matter, Atomic, Molecular and Chemical Physics, Biophysics, 19(12), 1839 - 1851.