Speaker
Dr
Jaehyun Lee
(National Fusion Research Institute)
Description
The bifurcation of perpendicular rotation ($v_{\perp}$) at the transition of ELM-crash suppression has been measured using electron cyclotron emission imaging (ECEI) system on KSTAR. The ECEI revealed that the ELM crashes are suppressed along with a rapid reduction of $v_{\perp}$, which synchronizes with the transition into and out of the ELM-crash suppression. The $v_{\perp}$ bifurcation is mainly attributed to the rapid change of $E \times B$ velocity and the $v_{\perp}$ magnitude is maintained the smallest near the $q_{95}$ rational flux surface during the ELM-crash suppression. The plasma response to the RMP, normalized by $v_{\perp}$ changes, is strongest in the vicinity of $q_{95}$ rational flux surface during the ELM-crash suppression.
| Country or International Organization | Korea, Republic of |
|---|---|
| Paper Number | EX/P7-13 |
Primary author
Dr
Jaehyun Lee
(National Fusion Research Institute)
Co-authors
Prof.
Gunsu YUN
(Pohang University of Science and Technology)
Dr
Gunyoung Park
(National Fusion Research Institute)
Prof.
Hyeon K. Park
(Ulsan National Institute of Science and Technology)
Dr
Jongha Lee
(National Fusion Research Institude)
Dr
Minjun J. Choi
(National Fusion Research Institute)
Dr
Minwoo Kim
(Ulsan National Institute of Science and Technology)
Dr
Won-Ha Ko
(National Fusion Research Institute)
Dr
Woochang Lee
(National Fusion Research Institute)
Dr
Yongkyoon In
(Ulsan National Institute of Science and Technology)
Dr
YoungMu Jeon
(National Fusion Research Institute)
