Speaker
Dr
Jaehyun Lee
(Ulsan National Institute of Science and Technology)
Description
The effect of static n=1 resonant magnetic perturbation (RMP) on edge-localized mode (ELM) and edge turbulence has been investigated using electron cyclotron emission imaging (ECEI) system. The ECEI revealed that filamentary ELM is still present in the edge when the ELM crash is completely suppressed by n=1 RMP. Correlation analysis showed the RMP enhances turbulent fluctuations in the edge toward the ELM-crash suppression phase. The spectral power distribution showed that edge turbulence has a linear dispersion for wide range of wavenumber and frequency. With velocimetry analysis, the turbulence has character of interchange mode which involves a net radial outward particle/heat transport. Bispectral analysis showed the nonlinear interaction between ELM and turbulent eddies, which implies that exchange of free energy between them may prevent the large ELM crashes.
| Country or International Organization | Republic of Korea |
|---|---|
| Paper Number | EX/P4-15 |
Primary author
Dr
Jaehyun Lee
(Ulsan National Institute of Science and Technology)
Co-authors
Prof.
Gunsu YUN
(Pohang University of Science and Technology)
Prof.
Hyeon K. Park
(UNIST)
Dr
JaeMin Kwon
(National Fusion Research Institute)
Dr
Minjun J. Choi
(National Fusion Research Institute)
Prof.
Neville C. Luhmann, Jr.
(University of California at Davis)
Dr
Woochang Lee
(UNIST)
Dr
YoungMu Jeon
(National Fusion Research Institute)
