TSUNAMI ANALYSIS OF NATIONAL-IGNITION-FACILITY 2-D GAS-DYNAMICS PHENOMENON

The tests in the chamber of National Ignition Facility will involve co mplex multi-dimensional dynamics phenomena. Many safety concerns relat e to the ablation of the chamber material and the re-condensation of i t. The x-ray induced ablation can vaporize surfaces of internal struct ures. The deposition of the ablated mass to the laser optics can cause significant damage to the laser optics. This study presents a typical analysis of the ablation from the target positioner in the NIF chambe r with the TSUNAMI two-dimensional gas dynamics code. Results reveal t hat the geometry of target positioner has strong influence to the vapo r mass amount and distribution over the chamber wall. The analysis don e here shows that it is possible to perform parametric study for diffe rent NIF chamber design configurations.