GA – A 25831 CONTROL OF TYPE-I ELMs BY RESONANT MAGNETIC PERTURBATIONS IN ITER SIMILAR SHAPED PLASMAS ON DIII-D by

Using the new high triangularity pumping capability on DIII-D, suppression of large Type-I edge localized modes (ELMs) by n=3 resonant magnetic perturbations (RMPs) from an internal coil (I-coil) was extended to ITER similar shape (ISS) plasmas with the ITER pedestal collisionality, "e * ~ 0.1. Comparison of a series of ISS plasmas with different n=3 RMPs, n=1 field-error correction, and residual intrinsic field-errors showed that for complete ELM suppression, the region of island overlap in the edge, calculated with vacuum fields, was greater than approximately 3-4 times the width of the total pressure pedestal.