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Eddy, drift wave and zonal flow dynamics in a linear magnetized plasma

Authors :
Naohiro Kasuya
Yoshihiko Nagashima
Hiroyuki Arakawa
Shigeru Inagaki
T. Kobayashi
Takuma Yamada
Maxime Lesur
Yusuke Kosuga
Akihide Fujisawa
S.-I. Itoh
Kimitaka Itoh
Makoto Sasaki
Source :
Scientific Reports
Publication Year :
2016
Publisher :
Nature Publishing Group, 2016.

Abstract

Turbulence and its structure formation are universal in neutral fluids and in plasmas. Turbulence annihilates global structures but can organize flows and eddies. The mutual-interactions between flow and the eddy give basic insights into the understanding of non-equilibrium and nonlinear interaction by turbulence. In fusion plasma, clarifying structure formation by Drift-wave turbulence, driven by density gradients in magnetized plasma, is an important issue. Here, a new mutual-interaction among eddy, drift wave and flow in magnetized plasma is discovered. A two-dimensional solitary eddy, which is a perturbation with circumnavigating motion localized radially and azimuthally, is transiently organized in a drift wave – zonal flow (azimuthally symmetric band-like shear flows) system. The excitation of the eddy is synchronized with zonal perturbation. The organization of the eddy has substantial impact on the acceleration of zonal flow.

Details

Language :
English
ISSN :
20452322
Volume :
6
Database :
OpenAIRE
Journal :
Scientific Reports
Accession number :
edsair.doi.dedup.....1e399b3022f3f587120083f66e590c9a