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)
