Surface analysis of tiles and samples exposed to the first JET campaigns with the ITER-like wall

This paper reports on the first post-mortem analyses of tiles removed from JET after the first campaigns with the ITER-like wall (ILW) during 2011-12 [1]. Tiles from the divertor have been analysed by ion beam analysis techniques and by secondary ion mass spectrometry to determine the amount of beryllium deposition and deuterium retention in the tiles exposed to the scrape-off layer. Films 10-20 µm thick were present at the top of tile 1, but only very thin films (<1 µm) were found in the shadowed areas and on other divertor tiles. The total amount of Be found in the divertor following the ILW campaign was a factor of ~ 9 less than the material deposited in the 2007-09 carbon campaign, after allowing for the longer operations in 2007-09.