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

doi:10.1143/JPSJ.77.114501

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

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18 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 language	English
Article number	114501
Journal	journal of the physical society of japan
Volume	77
Issue number	11
DOIs	https://doi.org/10.1143/JPSJ.77.114501
Publication status	Published - Nov 2008

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1143/JPSJ.77.114501

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Nagashima, Y., Itoh, S. I., Shinohara, S., Fukao, M., Fujisawa, A., Terasaka, K., Kawai, Y., Kasuya, N., Tynan, G. R., Diamond, P. H., Yagi, M., Inagaki, S., Yamada, T., & Itoh, K. (2008). Coexistence of zonal flows and drift-waves in a cylindrical magnetized plasma. journal of the physical society of japan, 77(11), Article 114501. https://doi.org/10.1143/JPSJ.77.114501

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title = "Coexistence of zonal flows and drift-waves in a cylindrical magnetized plasma",

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.",

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T1 - Coexistence of zonal flows and drift-waves in a cylindrical magnetized plasma

AU - Nagashima, Yoshihiko

AU - Itoh, Sanae I.

AU - Shinohara, Shunjiro

AU - Fukao, Masayuki

AU - Fujisawa, Akihide

AU - Terasaka, Kenichiro

AU - Kawai, Yoshinobu

AU - Kasuya, Naohiro

AU - Tynan, George R.

AU - Diamond, Patrick H.

AU - Yagi, Masatoshi

AU - Inagaki, Shigeru

AU - Yamada, Takuma

AU - Itoh, Kimitaka

PY - 2008/11

Y1 - 2008/11

N2 - 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.

AB - 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.

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ER -

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

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