Deuterium retention in tungsten and tungsten-tantalum alloys under high flux plasma exposure

The work presented in this thesis had two main goals. The first one was the comparative study of retention properties ofWandW-Ta alloys as a part of assessment of the applicability of this alloy as a plasma-facing material candidate, and the study of high-flux plasma-induced material modification in these materials. It was found that these two aspects - plasma-induced material modification and hydrogen isotopes retention - are closely interlinked, at least under the high-flux exposure conditions. Therefore the interconnection between them was explored as well. The experimental work presented in this thesis was focused on the comparative study of deuterium retention in reference W grade and investigated W-Ta alloys. Over the course of the study it became clear that deuterium retention under divertor-relevant high-flux exposure conditions.