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22-27 October 2018
Mahatma Mandir Conference Centre
Asia/Kolkata timezone
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Bifurcation of Perpendicular Rotation and Field Penetration at the Transition to RMP-induced ELM-crash Suppression

26 Oct 2018, 08:30
4h
Mahatma Mandir Conference Centre

Mahatma Mandir Conference Centre

Gandhinagar (nearest Airport: Ahmedabad), India
Poster P7 Posters

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)

Presentation Materials

Paper