Effects of electrode biasing on fluctuations and transport in the KT-5C tokamak

Author

Wang, Cheng ; Pan, Ge-Sheng ; Yu, Chang-Xuan ; Wen, Yi-Zhi ; Wan, Shu-De ; Wang, Zhi-jiang ; Liu, Wan-Dong ; Sun, Xuan ; Wang, Jun ; Gao, Hui

Author_Institution

Dept. of Modern Phys., Univ. of Sci. & Technol. of China, Hefei, China

Volume

30

Issue

2

fYear

2002

fDate

4/1/2002 12:00:00 AM

Firstpage

625

Lastpage

629

Abstract

Electrode biasing experiments are carried out on the KT-5C tokamak to investigate the effects of the radial electric field E_r on turbulence. A modestly enhanced E_r gradient layer is formed at the plasma edge by the electrode biasing. In the E_r gradient layer, reductions in the fluctuation amplitude, radial correlation length and turbulent particle flux are observed. These results support the theoretical models on the turbulence suppression by decorrelation due to E × B flow shear

Keywords

plasma boundary layers; plasma fluctuations; plasma magnetohydrodynamics; plasma toroidal confinement; plasma transport processes; plasma turbulence; shear turbulence; KT-5C Tokamak; decorrelation due; electrode biasing; flow shear; fluctuation amplitude; fluctuations; gradient layer; plasma edge; radial correlation length; radial electric field; transport; turbulence; turbulence suppression; turbulent particle flux; Electrodes; Electrons; Fluctuations; Plasma confinement; Plasma measurements; Plasma temperature; Plasma transport processes; Probes; Sun; Tokamaks;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/TPS.2002.1024260

Filename

1024260