Experimental plasma-wall interaction research
To validate code predictions, the group maintains close collaboration with JET, ASDEX Upgrade and other tokamaks in the world, with members actively participating in experiments. The investigations include the physics of divertor detachment, radiative divertors for heat flux mitigation, scrape-off layer flows, and impurity migration within the vacuum chamber.
The centerpiece of these investigations are dedicated tracer injection experiments using, for example 13C and 14N, and subsequent tile surface analyses to elucidate the transport of these elements from the source to the region of final deposition.
The figures below show the measured 13C deposition in ASDEX Upgrade and the ASCOT predictions – mapped onto the 2-D wall – for first deposition. The studies highlight the 3-D nature of impurity transport and deposition – which is unrealistic to be measured – and the importance of flows in the scrape-off layer.
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