2017-05-18 14:00 聂林

Time: 2017-05-18 14:00:00
Speaker: 聂林 [核工业西南物理研究院]
Place: 教十一413
Abstract: Time: Thursday, May. 18, 02:00 pm
Venue: Rm. 413, Bld. 11#, Yuquan Campus

Characterization of turbulent eddies and their associated transport

M. Xu1, L. Nie1, Yi Yu2, W. L. Zhong1, , and HL-2A team

1Southwestern Institute of Physics, Chengdu, China
2School of Nuclear Science and Technology, USTC, Hefei, China



The internal electric field of turbulent eddies has been experimentally measured by a two-dimensional Langmiur probe array, which shows potential peak or valley in both radial and poloidal directions. This is consistent the expectation that the internal electric field of turbulent eddies either points towards the center or away from the center in both poloidal and radial directions. Fluctuating electron temperature and density associated with turbulent eddies have also been measured, in both L-mode and H-mode, and through the L-H transitions as well. The phase of the fluctuation velocity in all of the above discharges, including the case during ELMs, show that eddies mediated the turbulent momentum in such a way to enhance the mean ExB shear flow in the edge.
简介:

聂林 博士 核工业西南物理研究院

Ph.D., Plasma Physics, 2009 - 2015
Univ. of Science & Tech. of China,
Research Associate, 2015 - Center for Fusion Science of Southwestern Institute of Physics (SWIP)

Major accomplishments include:
1. Doppler Coherence Imaging Spectroscopy (CIS): Designed and established a mid-plane CIS diagnostic system for HL-2A tokamak to measure the 2D toroidal rotation profile in the edge region.
2. Langmuir probe sheath potential coefficient correction: Designed swept probe experiment to correct the sheath potential coefficient of Langmuir probe, clarified the long standing question whether floating potential can be used to infer the radial electric field inside fusion plasmas;
3. Turbulence/Vortices/Filament transport: Compared the ELM-filament induced particle flux after Supersonic Molecular Beam Injection (SMBI)/ Pellet Injection/ Lower Hybrid Current Drive (LHCD). Measured the fluctuating electron temperature and density associated with turbulent eddies in both L-mode and H-mode. Analyzed the vortices induced poloidal momentum transport