Role of density modulation in driving nonlinear streamer flows in drift wave turbulence

Y. Kosuga; K. Hasamada

doi:10.1063/1.5049726

Role of density modulation in driving nonlinear streamer flows in drift wave turbulence

Y. Kosuga, K. Hasamada

Division of Nuclear Fusion Dynamics

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

The role of density modulation in driving streamer flows in drift wave turbulence is discussed. In contrast to the conventional shearing mechanism, we emphasize the impact of frequency modulation by meso-scale density perturbation. This mechanism is more effective for streamers than for zonal flows. The Reynolds stress and nonlinear growth rate are calculated. The result indicates that the streamer growth is enhanced due to the density modulation. Implications on the selection of streamers and zonal flows are discussed as well.

Original language	English
Article number	100701
Journal	Physics of Plasmas
Volume	25
Issue number	10
DOIs	https://doi.org/10.1063/1.5049726
Publication status	Published - Oct 1 2018

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1063/1.5049726

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title = "Role of density modulation in driving nonlinear streamer flows in drift wave turbulence",

abstract = "The role of density modulation in driving streamer flows in drift wave turbulence is discussed. In contrast to the conventional shearing mechanism, we emphasize the impact of frequency modulation by meso-scale density perturbation. This mechanism is more effective for streamers than for zonal flows. The Reynolds stress and nonlinear growth rate are calculated. The result indicates that the streamer growth is enhanced due to the density modulation. Implications on the selection of streamers and zonal flows are discussed as well.",

author = "Y. Kosuga and K. Hasamada",

note = "Funding Information: We acknowledge stimulating discussions with S. Inagaki, Y. Nagashima, F. Kin, M. Sasaki, P. H. Diamond, S.-I. Itoh, K. Itoh, and participants in the Festival de Theorie in France 2017 and the Chengdu Theory Festival (2018). This work was partly supported by the Grants-in-Aid for Scientific Research of JSPS of Japan (JP18K03578, JP15H02155, and JP17H06089), the joint research project in RIAM, and Asada Science Foundation.",

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T1 - Role of density modulation in driving nonlinear streamer flows in drift wave turbulence

AU - Kosuga, Y.

AU - Hasamada, K.

N1 - Funding Information: We acknowledge stimulating discussions with S. Inagaki, Y. Nagashima, F. Kin, M. Sasaki, P. H. Diamond, S.-I. Itoh, K. Itoh, and participants in the Festival de Theorie in France 2017 and the Chengdu Theory Festival (2018). This work was partly supported by the Grants-in-Aid for Scientific Research of JSPS of Japan (JP18K03578, JP15H02155, and JP17H06089), the joint research project in RIAM, and Asada Science Foundation.

PY - 2018/10/1

Y1 - 2018/10/1

N2 - The role of density modulation in driving streamer flows in drift wave turbulence is discussed. In contrast to the conventional shearing mechanism, we emphasize the impact of frequency modulation by meso-scale density perturbation. This mechanism is more effective for streamers than for zonal flows. The Reynolds stress and nonlinear growth rate are calculated. The result indicates that the streamer growth is enhanced due to the density modulation. Implications on the selection of streamers and zonal flows are discussed as well.

AB - The role of density modulation in driving streamer flows in drift wave turbulence is discussed. In contrast to the conventional shearing mechanism, we emphasize the impact of frequency modulation by meso-scale density perturbation. This mechanism is more effective for streamers than for zonal flows. The Reynolds stress and nonlinear growth rate are calculated. The result indicates that the streamer growth is enhanced due to the density modulation. Implications on the selection of streamers and zonal flows are discussed as well.

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