Speaker
Mr
Hyeon Park
(Republic of Korea)
Description
Following successful characterization of the growth, saturation and bursting process of the Edge Localized Mode (ELM) [1] by a 2D/3D Electron Cyclotron Emission Imaging (ECEI) system in KSTAR H-mode plasmas, the observed mode structure is verified via synthetic image reconstruction based on the BOUT++ code. In successive KSTAR campaigns, a wide range of toroidal mode numbers (~4 < n < ~16) of the ELMs have enabled the establishment of the relationship between the poloidal and toroidal mode numbers (m, n) through the local magnetic shear (safety factor - q) (<m>=nq). ELM dynamics observed simultaneously at both high and low field sides revealed necessity of the Pfirsh-Schlüter flow, shear suppression of high n modes and inconsistency in mode numbers suggested further study. In KSTAR campaigns, Magnetic Perturbation (MP) coils with n=1 and n=2 structures successfully suppressed the ELMs. In the ELM suppressed period, persisting mode structures accompanied with weak bursting behaviours were observed.
| Country or International Organisation | Korea, Republic of |
|---|---|
| Paper Number | EX/8-1 |
Author
Mr
Hyeon Park
(Republic of Korea)
Co-authors
C.W. Domier
(UCD)
Prof.
Gunsu Yun
(POSTECH)
Ms
J.E. Lee
(POSTECH)
Mr
Jaehyun Lee
(POSTECH)
Minjun Choi
(POSTECH)
Mr
Minwoo Kim
(POSTECH)
Dr
S.G. Lee
(NFRI)
Dr
S.W. Yoon
(NFRI)
Prof.
W. Lee
(POSTECH)
Dr
X.Q. Xu
(LLNL)
Dr
Y.M. Jeon
(NFRI)
Prof.
nevelle Luhmann, Jr.
(UCD)
