Toroidally localized turbulence and heat pulse propagation during RMP ELM suppression in KSTAR

A 3D variation of edge turbulence is observed under slowly rotating Resonant Magnetic Perturbation (RMP) with ELM suppression in the KSTAR tokamak. The density fluctuations show a 3D variation of bicoherence and amplitude at various frequencies, indicating a 3D variation of turbulence and its non-linear interaction. The 3D variation of density fluctuations is stronger in the pedestal region and becomes weaker in regions with a smaller ion temperature gradient. The localized turbulence variations are also observed in electron temperature and magnetic fluctuations. The estimated phase velocity with electron temperature fluctuation reverses its sign at a specific location slightly inside the pedestal region. Additionally, the electron cyclotron heating (ECH) modulation is applied to RMP-ELM suppressed plasma at the different toroidal locations of the applied 3D field. Lissajous curves of the electron temperature fluctuation and electron temperature modulation are investigated to identify their turbulence properties.