Heuristic predictions of RMP configurations for ELM suppression in ITER burning plasmas and their impact on divertor performance
Nuclear Fusion(2024)
Abstract
A subspace of resonant magnetic perturbation (RMP) configurations for edge
localized mode (ELM) suppression is predicted for H-mode burning plasmas at 15
MA current and 5.3 T magnetic field in ITER. Perturbation of the core plasma
can be reduced by a factor of 2 for equivalent edge stability proxies, while
the perturbed plasma boundary geometry remains mostly resilient. The striation
width of perturbed field lines connecting from the main plasma (normalized
poloidal flux < 1) to the divertor targets is found to be significantly
larger than the expected heat load width in the absence of RMPs. This
facilitates heat load spreading with peak values at an acceptable level below
10 MW m^-2 on the outer target already at moderate gas fueling and low Ne
seeding for additional radiative dissipation of the 100 MW of power into the
scrape-off layer (SOL). On the inner target, however, re-attachment is
predicted away from the equilibrium strike point due to increased upstream heat
flux, higher downstream temperature and less efficient impurity radiation.
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