Speaker
Dr
Youwen Sun
(Institute of Plasma Physics, Chinese Academy of Scienses)
Description
A big progress has been made in the type-I Edge Localized Mode (ELM) control with Resonant Magnetic Perturbation (RMP) on EAST in 2014 and 2015. A flexible in-vessel RMP coil system has been installed in 2014 for active MHD instabilities control to achieve long pulse steady state operation in the EAST tokamak. It can generate a variety range of spectrum covering most important configurations of the operating coil systems in present tokamaks and the designed one in future ITER. Complete suppression of ELM is observed during the application of n=1 and 2 RMP in EAST, and ELM mitigation is observed for all of the n=1-4 RMP in EAST. The transit peak flux on divertor is reduced during ELM suppression or mitigation. ELM control effect is sensitive to the RMP spectrum used. ELM suppression only happens in a limited resonant window during the scan of the phase difference between the upper and lower RMP coils. Plasma response plays an important role in the ELM control effect. The best spectrum of RMP for ELM suppression is consistent with the MARS-F modeling result.However, the transitions between ELM suppression and ELM mitigation are obviously non-linear. Critical thresholds for the amplitude of the RMP and the plasma rotation for this transition are observed. Clear density pump-out is normally observed during the application of RMP, while magnetic braking effect depends on the plasma rotation.Magnetic braking is observed in the NBI heated relatively high rotation plasma case, while it is not obvious, when the plasma rotation is close to 0 in radio frequency wave dominated heating plasmas. Footprint splitting is also observed during the application of RMP and agrees well with vacuum modelling. The enhancement of transport of the tungsten has also been observed during ELM mitigation.
| Country or International Organization | China |
|---|---|
| Paper Number | EX/P7-4 |
Primary author
Dr
Youwen Sun
(Institute of Plasma Physics, Chinese Academy of Scienses)
Co-authors
Dr
Baonian Wan
(Institute of Plasma Physics, Chinese Academy of Sciences)
Dr
Biao Shen
(Institute of Plasma Physics, Chinese Academy of Sciences)
Mr
Bin Zhang
(Institute of Plasma Physics, Chinese Academy of Sciences)
Dr
Bo Lyu
(Institute of Plasma Physics, Chinese Academy of Sciences)
Mr
Chu Zhou
(University of Science and Technology of China)
Dr
Dalong Chen
(Institute of Plasma Physics, Chinese Academy of Sciences)
Dr
Ge Gao
(Institute of Plasma Physics, Chinese Academy of Sciences)
Dr
Guoqiang Li
(Institute of Plasma Physica, CAS)
Mr
Hailing Zhao
(Institute of Plasma Physics, Chinese Academy of Sciences)
Dr
Huihui Wang
(Institute of Plasma Physics, Chinese Academy of Sciences)
Dr
Jinping Qian
(Institute of Plasma Physics, Chinese Academy of Sciences)
Dr
Liang Wang
(Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP))
Dr
Liqing Xu
(Institute of Plasma Physics, Chinese Academy of Sciences)
Ms
Manni Jia
(Institute of Plasma Physics, Chinese Academy of Sciences)
Mr
Minzhong Qi
(Institute of Plasma Physics, Chinese Academy of Sciences)
Mr
Nan Chu
(Institute of Plasma Physics, Chinese Academy of Sciences)
Dr
Peng Fu
(Institute of Plasma Physics, Chinese Academy of Sciences)
Dr
Qing Zang
(Institute of Plasma Physics, Chinese Academy of Sciences)
Mr
Shuai Gu
(Institute of Plasma Physics, Chinese Academy of Sciences)
Dr
Songke Wang
(Institute of Plasma Physics, Chinese Academy of Sciences)
Dr
Tonghui Shi
(Institute of Plasma Physics, Chinese Academy of Sciences)
Dr
Xiang Ji
(Institute of Plasma Physics, Chinese Academy of Sciences)
Ms
Xu Yang
(Dalian University of Technology, Dalian 116024, China)
Dr
Yingying Li
(Institute of Plasma Physics, Chinese Academy of Sciences)
Dr
Yueqiang Liu
(CCFE Culham Science Centre)
Mr
Yumin Wang
(Institute of Plasma Physics, Chinese Academy of Sciences)
Prof.
Yunfeng Liang
(Forschungszentrum Jülich GmbH, Germany)
Dr
Yuntao Song
(Institute of Plasma Physics, Chinese Academy of Sciences)
Dr
Zhicai Sheng
(Institute of Plasma Physics, Chinese Academy of Sciences)
Dr
tao Zhang
(Institute of Plasma Physics, Chinese Academy of Sciences)
Dr
wenfeng guo
(Institute of Plasma Physics, Chinese Academy of Sciences)
