Turbulent mixing in laser implosion

In order to study effects of implosion nonuniformity in laser driven targets, we have introduced a turbulent mixing model based on the k-ε type method into the one-dimensional implosion code ILESTA-1D. We have studied the effects of the turbulent mixing in the final stagnation phase. By applying the model to the experiments which have been carried out with LHART-type and CD-shell type targets in ILE, Osaka University, it is demonstrated that the most of the experimental results can be explained with assuming that the turbulence energy of 10-20% compared to the implosion kinetic energy is generated in the acceleration phase. It is quantitatively shown that the neutrons are not generated in the stagnation phase because of the cooling through the turbulent mixing. We finally propose an experiment to determine the degree of the turbulence energy by measuring the DT neutrons generated in the mixing zone. (author)