LIBS applicability for investigation of re-deposition and fuel retention in tungsten coatings exposed to pure and nitrogen-mixed deuterium plasmas of Magnum-PSI

We have investigated the applicability of Laser Induced Breakdown Spectroscopy (LIBS) for analyzing changes in composition and fuel retention W W-Ta coatings following exposure to D2 or mixed D2-N2 plasma beams linear device Magnum PSI. The exposed samples were characterized by situ ns-LIBS complementary analysis methods Secondary Ion Mass Spectroscopy, Energy Dispersive x-ray spectroscopy Nuclear Reaction Analysis. In agreement with used methods, LIBS revealed formation up 400 nm thick co-deposited surface layer central region which contained a higher concentration main impurities, such as N, metals, Ta Mo, latter originating mainly from substrate source. deuterium on other hand was highest outside coatings.