EFDA-JET-CP(08)02/25
Testing of Tungsten Coatings in JET for the ITER-Like Wall
A CFC tile 5 from the JET outer divertor, and CFC tiles from Neutral Beam shin-through and re-ionisation regions were coated with tungsten and exposed during the 2005-7 JET campaigns in preparation for the ITER-like Wall project. Approximately 1.6 microns of coating were eroded from the tile 5 during high-delta discharges when the outer strike point is on the tile. The coatings on the other tiles were unaffected by NB-heating and divertor discharges, however a tile mounted near the centre of the Inner Wall Guard Limiter lost all its coating from the surface within 10mm of the tile leading edge; this probably occurred during the ramp-up phase of JET discharges. Preprint of Paper to be submitted for publication in Proceedings of the 18th Plasma Surface Interactions in Controlled Fusion Devices Toledo, Spain ( 26th May 2008 - 30th May 2008)