Impurity release, disruption effects, and thermomechanical stress analysis of the first wall system for the IGNITEX experiment

A first-wall design and analysis for the proposed Fusion Ignition Experiment (IGNITEX) is presented. The design of the first wall system emphasizes plasma cleanness, simplicity of design, minimum complexity of remote maintenance systems and operation, and minimum cost. A limiterless first wall which consists of an amorphous carbon film applied to a beryllium substrates is considered. The beryllium is applied to the vacuum vessel by plasma jet spraying. Based on the limiterless geometry, impurity release during operation is estimated. Discharges are simulated with the PROCTR one-dimensional plasma transport code. Sputtering and helium ash recycling are considered as the main mechanisms of impurity release from the first wall. A new sputtering yield calculation for carbon surfaces is presented based on Monte Carlo studies (TRIM two dimensional ion implantation code). Disruption effects are simulated with the code DISRUP, which accounts for vapor-shielding effects. Evaluations of wall erosion under various disruptive scenarios are presented. Thermomechanical stresses are calculated using the finite element program ABAQUS. First-wall system preconditioning between experimental pulses is outlined