Abstract
The laser-induced breakdown spectroscopy (LIBS) approach has been used to ex-situ measure the deuterium (D) retention and carbon (C) deposition on the surface of tungsten (W) castellated blocks adopted from the Korea Superconducting Tokamak Advanced Research (KSTAR). The well-resolved D∖H spectra with a high signal to noise ratio (S/N) up to 500 has been achieved.The lateral distributions of the deposited C and detained D on the three different shaped divertor blocks (Rounded, Chamfered, Double chamfered) were investigated. The depth of the deposited C layer was also measured as ∼200 nm to ∼650 nm based on the spectral line intensity using a self-defined function approach. It was found that the edge shape strongly affects the C and D distribution features, which are dependent on the particle and heat flux arriving on the related area. The features of C and D deposition and their distributions on the different shaped blocks provide valuable information for the theoretical model on plasma-wall interaction. This indicates that LIBS has a unique potential for the diagnosis of impurity deposition and fuel retention in KSTAR or related fusion devices.
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