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  • Pakyari, Alireza  (4)
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  • 1
    Online Resource
    Online Resource
    Stationary turbulent spectra of toroidal η i mode
    AIP Publishing ; 1996
    In:  Physics of Plasmas Vol. 3, No. 10 ( 1996-10-01), p. 3628-3635
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 3, No. 10 ( 1996-10-01), p. 3628-3635
    Abstract: Toroidal ion temperature gradient (ITG) driven drift mode turbulence has been analyzed analyti- cally and numerically. By using weak nonlinearity arguments and random phase approxima- tion, dynamic and wave kinetic equations are derived. Three different nonlinearities, namely E×B, convective, and diamagnetic nonlinearities, play important roles in the turbulent spectral transfer. The power spectra of the weak ITG-mode turbulence are obtained analytically for |k|≫1 and |k| & lt;1 ranges in the wave number space. Forward energy cascading due to convective and diamagnetic nonlinearities will balance the inverse energy cascading due to E×B nonlinearity at |k|≊1/ρs (k is the wave number, ρs=cs/ωci, where cs is the sound velocity and ωci is the ion cyclotron frequency) and results in energy condensation at |k|≊1/ρs.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.871955
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1996
    detail.hit.zdb_id: 1472746-8
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Spectral transfer in a two-field model of drift wave turbulence
    IOP Publishing ; 1995
    In:  Physica Scripta Vol. 52, No. 5 ( 1995-11-01), p. 561-564
    Details
    In: Physica Scripta, IOP Publishing, Vol. 52, No. 5 ( 1995-11-01), p. 561-564
    Type of Medium: Online Resource
    ISSN: 0031-8949 , 1402-4896
    URL: Article
    DOI: 10.1088/0031-8949/52/5/013
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1995
    detail.hit.zdb_id: 1477351-X
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Dynamic properties of η i -mode weak turbulence
    Cambridge University Press (CUP) ; 1996
    In:  Journal of Plasma Physics Vol. 55, No. 1 ( 1996-02), p. 47-58
    Details
    In: Journal of Plasma Physics, Cambridge University Press (CUP), Vol. 55, No. 1 ( 1996-02), p. 47-58
    Abstract: The turbulence of the toroidal η i mode has a forward spectral cascade. This means that most of the energy initially placed in the low-wavenumber region (the linear instability region) will be spread out towards high-wavenumber modes. Therefore the linear instability may be reduced by this energy cascade. An elementary estimate of the critical amplitude for nonlinear mode coupling to balance the linear growth rate is given. As a consequence of three wave cascade process derivable from the fully toroidal fluid model equations, the formation of zonal flows η i -mode turbulence is predicted.
    Type of Medium: Online Resource
    ISSN: 0022-3778 , 1469-7807
    URL: Article
    DOI: 10.1017/S0022377800018651
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1996
    detail.hit.zdb_id: 2004297-8
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  • 4
    Online Resource
    Online Resource
    Toroidal η i -mode global vortices in a rotating plasma
    AIP Publishing ; 1996
    In:  Physics of Plasmas Vol. 3, No. 10 ( 1996-10-01), p. 3661-3667
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 3, No. 10 ( 1996-10-01), p. 3661-3667
    Abstract: Model equations describing dynamics of a toroidal ηi mode in a rotating plasma are derived. The stationary solution of the model equations is investigated analytically and the condition for global vortex formation is found. The form of the solution is verified numerically and it is shown that the shape of global vortices is affected strongly by the shear of the plasma poloidal rotation. In weak shear, the stationary solution looks like a dipole vortex, while in strong shear, the main part of the plasma cross section is occupied by vortex flow.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.871959
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1996
    detail.hit.zdb_id: 1472746-8
    Location Call Number Limitation Availability
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    Online Resource
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