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(FT/P1-15) Impacts of Carbon Impurity in Plasmas on Tungsten First Wall

Y. Ueda¹⁾, T. Shimada¹⁾, M. Nishikawa^1)
 
1) Osaka University, Suita, Japan

Abstract.  In order to study material mixing effects of carbon and tungsten on plasma material interactions, hydrogen ion beam (containing less than 1 % of carbon ion) irradiation experiments have been made with a steady-state and high-flux ion beam irradiation test device (HiFIT). By irradiation with 1 keV H⁺₃ beam with 0.40 % carbon with the fluence of the order of 10²⁴m^{- 2}, it was clearly observed that quite a lot of blisters with its size up to about 1.0 mm were formed at 653 K. On the other hand, significant blisters were not observed with 0.08 % carbon (other experimental parameters were the same). These small amounts of carbon also increased hydrogen retention in tungsten.

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