Reduction of the growth rate of Rayleigh-Taylor instabiliy in laser ablation experiments

摘要

It is shown theoretically that laser ablation can change the growth rate of the Rayleigh-Taylor instability. Rayleigh-Taylor instability can grow in the interface of the low density (light fluid) with density ρ and the target foil (heavy fluid) with density ρ. The variation of RT growth rate with the Atwood number which represents the relative density differences of the two fluids and also with the evaporated plasma velocity is studied. The results show that the growth rate for Co laser is low while it is high for KrF laser. Also it is shown that the growth rate is increased by increasing the relative density differences of the two fluids and is decreased by increasing plasma normalized velocity.