Abstract
The implications for the use of carbon based PFCs in next step devices are reviewed, with ITER as the reference example device. Issues with respect to steady-state operation concerning the carbon source at the divertor target in realistic conditions (including impurity seeding and mixed material formation caused by interaction of the plasma with the main chamber PFCs) and their implications for tritium retention are discussed taking into account other restrictions for next step plasma operation, such as the achievement of detached divertor operation with peak power loads <10 MW/m2. The effect of transient power loads on the divertor CFC target caused by ELMs are discussed and the implications for the use of CFCs at the divertor target for regimes with repetitive ELMs, acceptable from the divertor lifetime point of view, are reviewed.
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