Coexistence of zonal flows and drift-waves in a cylindrical magnetized plasma

Yoshihiko Nagashima, Sanae I. Itoh, Shunjiro Shinohara, Masayuki Fukao, Akihide Fujisawa, Kenichiro Terasaka, Yoshinobu Kawai, Naohiro Kasuya, George R. Tynan, Patrick H. Diamond, Masatoshi Yagi, Shigeru Inagaki, Takuma Yamada, Kimitaka Itoh

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Spatiotemporal structures of fluctuations with frequencies lower than the ion cyclotron frequency in a cylindrical magnetized plasma are investigated. Drift-wave and low-frequency zonal flow coexist. Electrostatic potentials of the zonal flow and the drift-wave are distributed widely in radius. The radial wave number profile of the zonal flow has a shear structure at the radial location where the drift-wave has a maximal normalized fluctuation amplitude. On the other hand, the radial wave number profile of the drift-wave shows vortex tilting, resulting in the generation of stationary turbulence Reynolds stress gradient per mass density. The envelope and bispectral analyses indicate significant nonlinear interactions between the zonal flow and the drift-wave.

Original languageEnglish
Article number114501
Journaljournal of the physical society of japan
Volume77
Issue number11
DOIs
Publication statusPublished - Nov 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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