TITLE

Global characteristics of zonal flows due to the effect of finite bandwidth in drift wave turbulence

AUTHOR(S)
Uzawa, K.; Jiquan Li; Kishimoto, Y.
PUB. DATE
April 2009
SOURCE
Physics of Plasmas;Apr2009, Vol. 16 Issue 4, p042304
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The spectral effect of the zonal flow (ZF) on its generation is investigated based on the Charney–Hasegawa–Mima turbulence model. It is found that the effect of finite ZF bandwidth qualitatively changes the characteristics of ZF instability. A spatially localized (namely, global) nonlinear ZF state with an enhanced, unique growth rate for all spectral components is created under a given turbulent fluctuation. It is identified that such state originates from the successive cross couplings among Fourier components of the ZF and turbulence spectra through the sideband modulation. Furthermore, it is observed that the growth rate of the global ZF is determined not only by the spectral distribution and amplitudes of turbulent pumps as usual, but also statistically by the turbulence structure, namely, their probabilistic initial phase factors. A ten-wave coupling model of the ZF modulation instability involving the essential effect of the ZF spectrum is developed to clarify the basic features of the global nonlinear ZF state.
ACCESSION #
38611564

 

Related Articles

  • Spectral transfers and zonal flow dynamics in the generalized Charney-Hasegawa-Mima model. Lashmore-Davies, C. N.; Thyagaraja, A.; McCarthy, D. R. // Physics of Plasmas;Dec2005, Vol. 12 Issue 12, p122304 

    The mechanism of four nonlinearly interacting drift or Rossby waves is used as the basic process underlying the turbulent evolution of both the Charney-Hasegawa-Mima-equation (CHME) and its generalized modification (GCHME). Hasegawa and Kodama’s concept of equivalent action (or quanta) is...

  • Drift wave versus interchange turbulence in tokamak geometry: Linear versus nonlinear mode structure. Scott, Bruce D. // Physics of Plasmas;Jun2005, Vol. 12 Issue 6, p062314 

    The competition between drift wave and interchange physics in general E-cross-B drift turbulence is studied with computations in three-dimensional tokamak flux tube geometry. For a given set of background scales, the parameter space can be covered by the plasma β and drift wave...

  • Linear study of the nonmodal growth of drift waves in dusty plasmas. Manz, P.; Greiner, F. // Physics of Plasmas;Jun2010, Vol. 17 Issue 6, p063703 

    The main effect of dust on drift wave turbulence is the enhancement of the nonadiabaticity. Previous work found that nonmodal behavior is important in the nonadiabatic regime of the drift wave system. Here, the modal and nonmodal properties of the linear Hasegawa–Wakatani system of dusty...

  • Role of the geodesic acoustic mode shearing feedback loop in transport bifurcations and turbulence spreading. Miki, K.; Diamond, P. H. // Physics of Plasmas;Mar2010, Vol. 17 Issue 3, p032309 

    A theory of the effect of the geodesic acoustic mode (GAM) on turbulence is presented. Two synergistic issues are elucidated: namely, the physics of the zonal flow modulation and its role in the L-H transition, and the role of the GAM wave group propagation in turbulence spreading. Using a...

  • Shear flow and drift wave turbulence dynamics in a cylindrical plasma device. Yan, Z.; Tynan, G. R.; Holland, C.; Xu, M.; Müller, S. H.; Yu, J. H. // Physics of Plasmas;Mar2010, Vol. 17 Issue 3, p032302 

    The experimental observations of the dynamics of the coupled drift wave turbulence (DWT)/sheared zonal flow (ZF) system in a cylindrical plasma device using a combination of Langmuir probe and fast-framing imaging measurements are reported. The results show the presence of an azimuthal ZF that...

  • Convergence study of bispectral analysis in experiments of high temperature plasmas. Nagashima, Y.; Itoh, S.-I.; Yagi, M.; Itoh, K.; Fujisawa, A.; Hoshino, K.; Shinohara, K.; Uehara, K.; Kusama, Y.; Ejiri, A.; Takase, Y. // Review of Scientific Instruments;Apr2006, Vol. 77 Issue 4, p045110 

    A convergence study of bispectral analysis on toroidal plasma turbulence is presented with a theoretical estimate of bicoherence for the system of the drift wave and zonal flow. Examples are chosen from the analysis of floating potential fluctuation in the edge region of the JFT-2M tokamak. The...

  • The role of coherent vorticity in turbulent transport in resistive drift-wave turbulence. Bos, W. J. T.; Futatani, S.; Benkadda, S.; Farge, M.; Schneider, K. // Physics of Plasmas;Jul2008, Vol. 15 Issue 7, p072305 

    The coherent vortex extraction method, a wavelet technique for extracting coherent vortices out of turbulent flows, is applied to simulations of resistive drift-wave turbulence in magnetized plasma (Hasegawa–Wakatani system). The aim is to retain only the essential degrees of freedom,...

  • Observation and analysis of particle drift islands in a torsatron. Gandy, R.F.; Lin, H.; Hartwell, G.J.; Knowlton, S.F.; Pritchard, D.; Hanson, J. // Physics of Plasmas;Aug95, Vol. 2 Issue 8, p2877 

    Presents the first direct measurement of islands in energetic particle drift surfaces. Importance of the understanding of the drift islands for the optimization of plasma confinement; Formation of drift islands in energetic electron drift surfaces as a result of resonant magnetic field...

  • Theory of drift waves in the presence of parallel and perpendicular flow curvature. I. Slab model. Sen, S.; Sen, A. // Physics of Plasmas;Jun96, Vol. 3 Issue 6, p2224 

    Focuses on the effect of perpendicular flow curvature on drift-like microinstabilities. Ratio of stabilizing influences of the perpendicular to the parallel flow curvature scales; Importance of both the parallel and the perpendicular flow curvatures in the plasma confinement improvement which...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics