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Oct 13 – 18, 2014
Hotel Park Inn Pribaltiyskaya
Europe/Moscow timezone

The Observation of Pedestal Turbulence Contributing Inward Particle and Heat Flux on the Edge of HL-2A Tokamak

Oct 17, 2014, 8:30 AM
4h
Green 8-9 (Hotel Park Inn Pribaltiyskaya)

Green 8-9

Hotel Park Inn Pribaltiyskaya

Saint Petersburg, Russian Federation
Poster Poster 7

Speaker

Dr Defeng Kong (Institute of Plasma Physics Chinese Academy of Sciences)

Description

The theoretical and experimental results indicate that the total confinement of the core plasma in a fusion device relies on the structure of pedestal on the edge, and the pedestal turbulence plays an essential role on the pedestal structure. The pedestal turbulence have been studied by using the Langmuir probe arrays on the edge of HL-2A tokamak. The probe arrays were performed about 1cm inside the separatrix With the NBI heating power of 0.7MW and ECRH power of 1MW, some kind of low frequency (20~80kHz) pedestal turbulence (shorted for LFT) with large amplitude has been observed during the construction and recovery of pedestal on HL-2A. The LFT begins to excite with the increasing of local electron density and temperature. Amplitude of LFT is large about ~250V in the potential field, while the corresponding magnetic fluctuations of LFT is weak. The abnormal particle and heat flux contributed by LFT have also been measured by four-tip probe. The result shows that the LFT contributed inward particle and total heat flux during the construction and recover of the pedestal on HL-2A. Those results may indicate a physical mechanism of the construction of the pedestal after the L-H mode transition, as well as the recovery of pedestal between ELMs.
Country or International Organisation China
Paper Number EX/P7-33

Primary author

Dr Defeng Kong (Institute of Plasma Physics Chinese Academy of Sciences)

Co-authors

Dr Adi Liu (University of Science and Technology of China) Prof. Changxuan Yu (University of Science and Technology of China) Prof. Hong Li (University of Science and Technology of China) Mr Huagang Shen (University of Science and Technology of China) Prof. Jiaqi Dong (Southwestern Institute of Physics) Dr Jinlin Xie (University of Science and Technology of China) Mr Jun Cheng (Southwestern Institute of Physics) Prof. Longwen Yan (Southwestern Institute of Physics) Mr Min Xu (Southwestern Institute of Physics) Dr Shoubiao Zhang (Institute of Plasma Physics) Prof. Tao Lan (University of Science and Technology of China) Dr Tao Zhang (Institute of Plasma Physics) Prof. Wandong Liu (University of Science and Technology of China) Weixing Ding (UCLA) Prof. Wenyu Hong (Southwestern Institute of Physics) Prof. Xiang Gao (Institute of Plasma Physics, Chinese Academy of Sciences) Prof. Xuan Sun (University of Science and Technology of China)

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