Co-deposited layers in the divertor region of JET-ILW

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Abstract

Abstract Tungsten-coated carbon tiles from a poloidal cross-section of the divertor and several types of erosion-deposition probes from the shadowed areas in the divertor were studied using heavy ion elastic recoil detection to obtain quantitative and depth-resolved deposition patterns. Deuterium, beryllium, carbon, nitrogen and oxygen along with tungsten and Inconel components are the main species detected in the studied surface region. The top of Tile 1 in the inner divertor is the main deposition area where the greatest amounts of deposited species are measured. Beryllium and tungsten-containing deposits on the probes (test mirrors and quartz microbalance) indicate that both low-Z and high-Z metals are transported to remote areas. Deposition of nitrogen-15 tracer used for edge cooling only at the end of experimental campaigns in 2012 was also detected giving evidence that nitrogen is effectively retained in wall components.

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Petersson, P., Rubel, M., Esser, H. G., Likonen, J., Koivuranta, S., & Widdowson, A. (2015). Co-deposited layers in the divertor region of JET-ILW. Journal of Nuclear Materials, 463, 814–817. https://doi.org/10.1016/j.jnucmat.2014.12.077

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