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15th International Conference on Plasma Surface Interactions in Controlled Fusion Devices (PSI 15), Gifu, 2002-05-26 to 2002-05-31
Abstract:
A new method for the determination of massive erosion and deposition on plasma facing
components has been developed and was tested successfully on a graphite tile of the ALT-II limiter
of TEXTOR. The surface profile of the tile was measured before and after exposure to plasma
discharges with an optical profiler, erosion or deposition is determined from the difference of the
two profiles. The profiles were determined relative to specially machined holes, which provide
stable reference points. An accuracy of about 1 μm can be achieved. After exposure for 7625
plasma seconds a maximum erosion of 28 μm carbon is observed in erosion dominated areas, while
a maximum deposition of about 40 μm is observed in net redeposition areas. The composition and
structure of the redeposited layers were investigated with secondary ion mass spectroscopy and
scanning electron microscopy.
