Numerical simulations of stimulated Raman scattering in LIL transport section with Miro propagation code and comparison with ENOLIT diagnostic results

We present a comparison between numerical simulations and experimental results of Stimulated Raman Scattering (SRS) in the transport section of the LIL laser facility. These simulations have been performed with Miro propagation code and the results have been compared with experimental data obtained during the 2004 commissioning campaign. For the first time Miro code is validated concerning SRS on a complex laser scheme and on a massively parallel computer. The tube effect modeling seems to be good even when the argon concentration changes allowing us to study different tube configurations or lengths without experimental measurements. We demonstrate experimentally and numerically that argon tubing reduces greatly the Raman conversion rate (RCR). We also show that the smoothing technique and the ICF (inertial confinement fusion) pulse foot do not increase the RCR. Miro simulations are in good qualitative and quantitative agreement with experimental results