High Heat Flux Facility GLADIS at IPP Garching

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Results: influence of particle fluence on erosion (2) constant surface temperature 1000°C 1·10 24 He/m² calculated erosion: 0.5 µm 1 µm No pronounced dependence on fluence Surface degradation occurred after very low fluence Balance between bubble formation and erosion rate 1·10 25 He/m² H. Greuner, IPP Garching PMTS Workshop, Aug.31 –Sep.2 2010 Oak Ridge, TN, USA 10 1 µm calculated erosion: 5 µm FIB cross-sections M.Balden
Summary He loading Helium loading: Morphology dominated by physical sputtering due to He. For lower temperatures the erosion patterns depend on the local orientation of each individual grain. T surf < 850°C Cone and wave structures for long pulses and high fluence, loss of micro particles T surf 1000 – 1500°C Formation of sharp cone like structures; nano-sized bubbles inside cones no pronounced dependence on fluence or surface temperature T surf > 2000°C Formation of coral-like structures with depth of several µm Conclusions: • He bombardment modifies the surface stronger as expected • results in higher erosion rate and possible dust production • but: no catastrophic effects expected concerning lifetime of plasma facing material • at present no consistent explanation of formation mechanism of all observed structures available. Further investigations are necessary, especially effects of mixed H/He loading (in progress) H. Greuner, IPP Garching PMTS Workshop, Aug.31 –Sep.2 2010 Oak Ridge, TN, USA 11
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Summary • GLADIS is a well-charac
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High Heat Flux Facility GLADIS at IPP Garching

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