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Physics of Plasmas / Volume 19 / Issue 2 / LETTERS

Phys. Plasmas 19, 020701 (2012); http://dx.doi.org/10.1063/1.3676597 (4 pages)

Analysis on the exclusiveness of turbulence suppression between static and time-varying shear flow

Y. Z. Zhang1, T. Xie2, and S. M. Mahajan3

1Center for Magnetic Fusion Theory, Chinese Academy of Sciences, Hefei China
2Southwestern Institute of Physics, Chengdu, China
3Institute for Fusion Studies, University of Texas at Austin, Austin, Texas 78712, USA

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(Received 13 September 2011; accepted 4 November 2011; published online 3 February 2012)

The analytical theory of turbulence suppression by shear flow [Y. Z. Zhang and S. M. Mahajan, Phys. Fluids B 4, 1385 (1992)] is extended to analyze the combined actions of flows that have time-varying as well as static components. It is found that each component, appearing alone, may yield the same suppression level. However, when both components co-exist, either tends to diminish the suppression caused by the other in certain parameter ranges—a conclusion that agrees with recently published simulation results by Maeyama et al. [Phys. Plasmas 17, 062305 (2010)]. In particular, the mutual exclusiveness is maximized as the strengths of the two components become comparable. The adopted averaging method of the asymptotic theory reveals that it is the coupling between the time-varying shear flow and the induced time-varying relative orbit motion that causes the asymmetry of the two components in turbulence suppression. The numerical results based on a Floquet analysis are also presented for comparison. The implications of the theory to L-H transition on tokamaks are discussed, especially, regarding experimental observations of the disappearance of the geodesic acoustic mode in H phases.

© 2012 American Institute of Physics

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KEYWORDS, PACS, and IPC

Keywords

plasma flow, plasma simulation, plasma toroidal confinement, plasma turbulence, Tokamak devices

PACS

International Patent Classification (IPC)

  • H05H1/02

    Arrangements for confining plasma by electric or magnetic fields; Arrangements for heating plasma

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3676597

PUBLICATION DATA

ISSN

1070-664X (print)  
1089-7674 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    H. Biglari, P. H. Diamond, and P. W. Terry, Phys. Fluids B 2, 1 (1990)PFBPEI000002000001000001000001.

    K. C. Shaing, E. C. Crume, Jr., and W. A. Houlberg, Phys. Fluids B 2, 1492 (1990)PFBPEI000002000006001492000001.

    T. S. Hahm, M. A. Beer, Z. Lin, G. W. Hammett, W. W. Lee, and W. M. Tang, Phys. Plasmas 6, 922 (1999)PHPAEN000006000003000922000001.

    S. Maeyama, A. Ishizawa, T.-H. Watanabe, M. M. Škorić, N. Nakajima, S. Tsuji-Iio, and H. Tsutsui, Phys. Plasmas 17, 062305 (2010)PHPAEN000017000006062305000001.


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