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Poloidally localized edge density fluctuation with applied and spontaneous 3-D fields in experimental advanced superconducting tokamak (EAST)

Authors :
Huajian Liu
K. X. Ye
F. B. Zhong
F. Wen
M. F. Wu
Youwen Sun
S. B. Zhang
East Team
Kangning Geng
Yijun Wang
Han Xiang
T. Zhang
G. S. Li
Junchao Huang
Xiang Gao
Source :
Physics of Plasmas. 26:092504
Publication Year :
2019
Publisher :
AIP Publishing, 2019.

Abstract

Poloidally localized density fluctuation with applied and spontaneous 3-D fields in high-confinement mode (H-mode) plasma is observed by using poloidally distributed multichannel interferometer diagnostics in the experimental advanced superconducting tokamak. With the application of an n = 1 rotating nonaxisymmetric magnetic perturbation (NAMP) field, a density fluctuation appears on different interferometer channels sequentially. Evidence shows that this fluctuation is located at the plasma edge. When an n = 1 static NAMP field is applied, the density fluctuation amplitude increases in parts of channels but decreases in other channels, implying a poloidal localization. This localization is enhanced with the increase in the NAMP field. In addition, when a spontaneous n = 1 external kink mode with a frequency of ∼3.5 kHz appears in the plasma edge, the amplitude of density fluctuation is modulated by the n = 1 kink. This modulation could be attributed to the localization effect on fluctuation by the 3-D fields of the spontaneous kink mode.

Details

ISSN :
10897674 and 1070664X
Volume :
26
Database :
OpenAIRE
Journal :
Physics of Plasmas
Accession number :
edsair.doi...........5ac4421c39dcfadc4a7cea1d2d396305
Full Text :
https://doi.org/10.1063/1.5119020