[EX / P7-8] 27th IAEA Fusion Energy Conference – J. Jang, et. al ELM SUPPRESSION AND INTERNAL TRANSPORT BARRIER FORMATION BY KRYPTON SEEDING IN KSTAR H-MODE PLASMAS [EX / P7-8] (1) ELM Mitigation and Suppression by Kr Seeding (2) Internal Transport Barrier Formation by Kr Seeding (a) Medium Kr level (b) High Kr level ITB ITB ITB (3) 2D images of plasma radiation and Kr density Plasma radiation (kW/m3) <Summary> By krypton (Kr) impurity seeding in KSTAR divertor, ELM mitigated and ELM suppressed H-modes were achieved. Internal transport barrier formation was observed in both ion and electron energy channels. Kr density (1016 /m3)