Speaker
Mr
Wulu Zhong
(China)
Description
For the first time, a high performance ELM-free H-mode was observed in the HL-2A tokamak.It was realized with Electron Cyclotron Resonance Heating (ECRH) and co-current Neutral Beam Injection (NBI) heating. The H98y2 factor increased by about 40-50% compared with the one before the transition. This regime is triggered by a minor disruption via the edge current change, where the temperature profile undergoes a sudden contraction. The mechanism leading to this regime is investigated. During the ELM-free phase, the edge particle transport barrier is formed with peaked central density, and the edge turbulence is significantly reduced. An EHO mode has been identified in the ELM-free H-mode plasmas. It propagates poloidally in the direction of the electron diamagnetic drift velocity and toroidally in the direction of the plasma current and NBI. The edge particle transport is enhanced with EHO which locates near the q95 surface. Interesting, the EHO/ELM transition during the plasma current ramp phase has been observed with a transient phase where the EHO and grassy ELM coexist. And each burst of the grassy ELM tends to stabilize the EHO. Thus the amplitude of the EHO becomes more fluctuant in the case of mixture of EHO and grassy ELM. During this phase, the EHO amplitude is decreasing and then it is completely disappeared, and ELMs appear with increasing density. It is likely that these transitions are governed by the edge current profile and the pedestal gradient.
Country or International Organization of Primary Author
China
Primary author
Mr
Wulu Zhong
(China)
Co-authors
Dr
Deliang yu
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Fan xia
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Guanjiu lei
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Jianyong cao
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Jiaqi dong
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Mr
Jiaxian li
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Jun cheng
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Jun rao
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Jun zhou
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Liaoyuan chen
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Longwen yan
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Mei huang
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Qingwei yang
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Wei chen
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Weiwen xiao
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Mr
Xianli huang
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Xianming Song
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Xiaolan zou
(CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France)
Dr
Xiaoquan ji
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Xiaoyu han
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Xuantong ding
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Xuru duan
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Yan zhou
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Yi liu
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Yipo zhang
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Yong liu
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Yuan huang
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Ms
Yuan xu
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Yunbo dong
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Mr
Zetian liu
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Zhengying cui
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
Dr
Zhongbing shi
(Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, People’s Republic of China)
