Since 18 of December 2019 conferences.iaea.org uses Nucleus credentials. Visit our help pages for information on how to Register and Sign-in using Nucleus.

17–22 Oct 2016
Kyoto International Conference Center
Japan timezone

Direct Destabilizations of Macro/Micro Edge Instabilities by Magnetic Perturbations

19 Oct 2016, 14:00
4h 45m
Kyoto International Conference Center

Kyoto International Conference Center

Takaragaike, Sakyo-ku, Kyoto 606-0001 Japan
Poster EXW - Magnetic Confinement Experiments: Wave–plasma interactions; current drive; heating; energetic particles Poster 4

Speaker

Dr Jayhyun Kim (National Fusion Research Institute)

Description

It has been regarded that magnetic perturbation (MP) by non-axisymmetric fields is the most promising technique in controlling edge localized mode (ELM) crashes that are potentially harmful to the lifetime of first wall in reactor scale devices. However, the exact mechanism of MP has not been fully understood in both ELM crash mitigation and suppression. Here, we investigated the characteristics of macro and micro edge instabilities in relation to MP during ELM crash controlled discharges of KSTAR. Especially, the MP turning-off periods were focused in order to rule out the effect of pedestal evolution. As a result, it was found that the response of macro and micro edge instabilities is very prompt against the applied MP. It suggests that the MP could directly drive macro and also micro instabilities of edge plasmas otherwise the discharge was stable against them. The detailed analyses are still on-going with local fluctuation measurements and numerical/theoretical efforts to reveal the underlying features of MP-driven edge instabilities.
Country or International Organization Republic of Korea
Paper Number EX/P4-5

Primary author

Dr Jayhyun Kim (National Fusion Research Institute)

Co-authors

Dr Jaehyun Lee (Ulsan National Institute of Science and Technology) Dr Jaemin Kwon (National Fusion Research Institute) Dr Minjun J. Choi (National Fusion Research Institute) Dr Si-Woo Yoon (National Fusion Research Institute) Dr YoungMu Jeon (National Fusion Research Institute)

Presentation materials