The laser-driven isentropic compression and numerical studies of the iron alpha-epsilon transition in the context of planetology

The iron alpha-epsilon transition is one of the most studied phase transition. However, in the case of isentropic compression, the influences of this transition on the high-pressure states of iron are still unknown. We will present some experimental results and their numerical simulations. During this experiment performed on the Janus laser facility (LNLL), different pressure ramp shapes were used to study the dynamic of the alpha-epsilon transition and its influences on the final thermodynamic state. These results are important for the reproducing of Earth and Super-earth core conditions (2-15 Mbar, 5000-15000 K) on laboratory where the isentropic compression is the only promise experimental scheme.