Abstract
The analysis of the heating properties with ICRH in ASDEX is complemented by the study of edge physics, aimed at understanding and avoiding some of the deleterious effects which presently limit in some cases the usefulness of this heating method. We review the advances that have been made on ASDEX, thereby concentrating on second harmonic heating. Experimental observations and several hardware modifications, made over the years in the machine are in agreement with the assumption that in the divertor tokamak ASDEX both additional impurity generation and a change in the transport of impurities in the scrape-off layer have to considered. The increased impurity generation is localized on the multipole protective cover near the entrance to the divertor. The need to properly design the structure close to the scrape-off layer, for an ICRF heated divertor tokamak, is emphasized.
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