SIMULATION OF PREHEATING EFFECTS IN SHOCK-WAVE EXPERIMENTS

We have analyzed the shock wave propagation experiments performed at L ULI and presented at ECLIM'94. The targets were aluminium foils with t hickness from 5 to 25 mu m. Simulations were performed with the SARA-1 D multigroup radiation code. We have shown a small level of preheating caused by the absorption of X-rays with energies close to the K-edge of aluminum. Several sets of opacities were used in order to study thi s effect, including experimental values for cold aluminum. Simulations show a small level of visible emission induced by X-ray preheating be fore the arrival of the shock.