RMP-driven, ELM-crash-suppression on KSTAR for ITER

KSTAR has made significant progress in resonant magnetic perturbation (RMP)-driven, edge-localized-mode (ELM)-crash-suppression in support of ITER. Utilizing the unique capability to realize ITER-like 3-row RMP configurations, a set of intentionally misaligned configurations (IMC) have been confirmed to be not only compatible with ELM-crash-suppression, but also effective in broadening the divertor heat fluxes with minimal electromagnetic loads [1]. In contrast, since no or little broadening was found in 2-row, IMC-driven ELM-crash-suppression, the origin of the divertor heat flux broadening is being investigated. Although ideal MHD-based field line tracing was not accompanied by any broadening feature, the inclusion of plasma rotation appears quite promising. The presence of the 3$^{\mathrm{rd}}$ row in IMC might have led to the additional deformation on magnetic topology that would have been helically structured by dominantly resonant components from 2 rows. Based on newly established ITER similar shape (ISS) plasmas, an initial attempt of n$=$1 RMP on q$_{\mathrm{95\thinspace }}$\textasciitilde 3.2 was frequently challenged by mode-locking without ELM-suppression yet. The application of n$=$2 RMP is considered more favorable not only for ELM-crash-suppression but also for ITER-like detached plasmas. [1] Y. In et al, IAEA-FEC (2018)