Large-scale flows and coherent structure phenomena in flute turbulence

Sandberg, Ingmar; Andrushchenko, Zhanna; Павленко, В. Б.

doi:10.1063/1.1883183

Cited by 13 publications

(13 citation statements)

References 19 publications

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“…This will eventually lead to a new saturation mechanism for the Alfvén wave growth, which is destabilized by fast ions and alpha particles in magnetic fusion devices. 27,28 Given the generality of the present formalism, our results can easily be extended to other situations, such as those related with the excitation ion acoustic waves by plasmon turbulence, 17 or the excitation of zonal flows by ion temperature gradient modes, 13 or by flute mode turbulence, 29 which were previously discussed in the frame of geometric optics. The stability of tearing modes in a turbulent plasma 30 could also be revisited in the frame of the present model.…”

Section: Discussionmentioning

confidence: 65%

Improved model of quasi-particle turbulence (with applications to Alfvén and drift wave turbulence)

Mendonça

Hizanidis

2011

Physics of Plasmas

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We consider the classical problem of wave stability and dispersion in a turbulent plasma background. We adopt a kinetic description for the quasi-particle turbulence. We describe an improved theoretical approach, which goes beyond the geometric optics approximation and retains the recoil effects associated with the emission and absorption of low frequency waves by nearly resonant quasi-particles. We illustrate the present approach by considering two particular examples. One is the excitation of zonal flows by drift wave turbulence or driftons. The other is the coupling between ion acoustic waves and Alfvén wave turbulence, eventually leading to saturation of Alfvén wave growth. Both examples are relevant to anomalous transport in magnetic fusion devices. Connection with previous results is established. We show that these results are recovered in the geometric optics approximation.

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Section: Discussionmentioning

confidence: 65%

Improved model of quasi-particle turbulence (with applications to Alfvén and drift wave turbulence)

Mendonça

Hizanidis

2011

Physics of Plasmas

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“…In the large scale approximation ∇ 2 ⊥ 1 the set of Eqs. (5) and (8) corresponds to similar equations of Das et al (2001), Dastgeer et al (2002) and Sandberg et al (2005).…”

Section: Hydrodynamic Descriptionmentioning

confidence: 99%

“…Instability of magnetic curvature driven flute waves is a counterpart of the classic RayleighTaylor instability of inhomogeneous fluid where the effective gravitational field is modeled by the centrifugal acceleration of particles moving in curved magnetic field configurations those intrinsic to laboratory experiments. Nonlinear dynamics of the flute waves has been investigated in some recent papers (Das et al, 2001;Dastgeer et al, 2002;Kodama and Pavlenko, 1988;Sandberg and Shukla, 2004;Sandberg et al, 2005;Sharma et al, 2007). Analytical investigations and numerical simulations show that in small-scale flute turbulence Correspondence to: O.…”

Section: Introductionmentioning

confidence: 99%

Magnetic curvature driven Rayleigh-Taylor instability revisited

Pokhotelov

Onishchenko

2011

Ann. Geophys.

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Abstract. The problem of incomplete finite ion Larmor radius (FLR) stabilization of the magnetic curvature driven Rayleigh-Taylor instability (RTI) in low beta plasma with homogeneous ion temperature is investigated. For this purpose a model hydrodynamic description of nonlinear flute waves with arbitrary spatial scales compared to the ion Larmor radius is developed. It is shown that the RTI is not stabilized by FLR effects in a plasma with cold electrons when the ratio of characteristic spatial scale of the plasma inhomogeneity to local effective radius of curvature of the magnetic field lines is larger than 1/4. The crucial role in the absence of the complete FLR stabilization plays the contribution of the compressibility of the polarization part of the ion velocity.

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“…Equations (7) and (8) in the large-scale approximation ∇ 2 ⊥ Ӷ1 correspond to the equations analyzed in [9][10][11][12][13].…”

Section: Hydrodynamic Equationsmentioning

confidence: 99%

Stabilization of magnetic curvature-driven Rayleigh–Taylor instabilities

et al. 2011

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Abstract. The finite ion Larmor radius (FLR) stabilization of the magnetic curvaturedriven Rayleigh-Taylor (MCD RT) instability in a low beta plasma with nonzero ion temperature gradient is investigated. Finite electron temperature effects and ion temperature perturbations are incorporated. A new set of nonlinear equations for flute waves with arbitrary wavelengths as compared with the ion Larmor radius in a plasma with curved magnetic field lines is derived. Particular attention is paid to the waves with spatial scales of the order of the ion Larmor radius. In the linear limit, a Fourier transform of these equations yields an improved dispersion relation for flute waves. The dependence of the MCD RT instability growth rate on the equilibrium plasma parameters and the wavelengths is studied. The condition for which the instability cannot be stabilized by the FLR effects is found.

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Large-scale flows and coherent structure phenomena in flute turbulence

Cited by 13 publications

References 19 publications

Improved model of quasi-particle turbulence (with applications to Alfvén and drift wave turbulence)

Improved model of quasi-particle turbulence (with applications to Alfvén and drift wave turbulence)

Magnetic curvature driven Rayleigh-Taylor instability revisited

Stabilization of magnetic curvature-driven Rayleigh–Taylor instabilities

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