Behaviors of chamber wall materials exposed to x-rays and ions under target implosions for inertial fusion energy

Various candidate materials were irradiated with intense proton beams at Yokohama campus of Tokyo Institute of Technology (TITech), and some others were irradiated with intense nitrogen beams at Albuquerque site of Sandia National Laboratories (SNL). Intense X-rays of SNL were also used to irradiate other materials. A series of numerical calculations of X-ray ablations was additionally performed at TITech, which results were compared with the experimental ones. Our aims were to supply necessary data for the future design of inertial fusion reactor chambers. One of the key issues in this field was the ablation thickness of the various chamber wall materials with typical inertial fusion reactions. We measured the ablation thickness of various samples, and we also observed the surface conditions of the samples before and after the irradiations with a microscope and an X-ray luminescence composition analyzer. Associated technical issues for the subject including UV-laser ablation, in-situ measurement of ablated thickness and a few new ion sources were also mentioned in short.