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Oct 13 – 18, 2014
Hotel Park Inn Pribaltiyskaya
Europe/Moscow timezone

Successful ELM Suppressions in a Wide Range of q95 Using Low n RMPs in KSTAR and its Understanding as a Secondary Effect of RMP

Oct 14, 2014, 12:05 PM
20m
Blue 1-5 (Hotel Park Inn Pribaltiyskaya)

Blue 1-5

Hotel Park Inn Pribaltiyskaya

Saint Petersburg, Russian Federation
Oral 3D Physics

Speaker

Mr YoungMu Jeon (Republic of Korea)

Description

As the most plausible technique to control the edge localized modes (ELMs) of high confinement mode (h-mode) plasmas, which is critical for ITER and beyond, non-axisymmetric resonant magnetic perturbations (RMPs) have been actively investigated in KSTAR. Since the first success of ELM suppression using n=1 RMPs in 2011 [1], our effort has been devoted to extend the operation regime of ELM control for both external magnetic configurations and plasma parameters. As results, it shows a possibility that the ELM-suppression can be achieved in a wide range of q95 (=3.5~6.5) if the RMP field is configured properly. Several unique features of RMP-driven ELM-suppression are found, by which the physics mechanisms of ELM suppression and mitigation can be explicitly distinguished. These are a long time delay (a secondary effect) and an improved confinement (transport bifurcation). Furthermore, a persistent, rapidly repeating bursty event, localized in the plasma edge, is observed and suggested as a key player in the underlying physics mechanism of RMP-driven ELM-suppression. [1] Y.M. Jeon et al., Phys. Rev. Lett. 109, 035004 (2012)
Paper Number EX/1-5
Country or International Organisation Korea, Republic of

Primary author

Mr YoungMu Jeon (Republic of Korea)

Co-authors

Dr Gunyoung Park (National Fusion Research Institute) Dr Hyunsun HAN (Nuclear Fusion Research Institute, Korea) Dr Jong-Gu Kwak (National Fusion Research Institute) Dr Jong-Kyu Park (Princeton Plasma Physics Laboratory) Dr Jun Gyo Bak (National Fusion Research Institute) Mr Kyu Dong Lee (National Fusion Research Institute) Dr Sang Gon Lee (National Fusion Research Institute) Dr Si-Woo Yoon (National Fusion Research Institute) Dr Todd E. Evans (General Atomics) Dr Won Ha Ko (Korea, Republic of) Dr Yeong-Kook Oh (National Fusion Research Institute) Dr Yong Un Nam (National Fusion Research Institute) Prof. Young-chul Ghim (Korea Advanced Institute of Science and Technology)

Presentation materials