Role of stable modes in zonal flow regulated turbulence
نویسندگان
چکیده
Related Articles The q-profile effect on high-order harmonic q=1 tearing mode generation during sawtooth crashes Phys. Plasmas 19, 062108 (2012) Aspect ratio effects on neoclassical tearing modes from comparison between DIII-D and National Spherical Torus Experiment Phys. Plasmas 19, 062506 (2012) Rapid filamentation of high power lasers at the quarter critical surface Phys. Plasmas 19, 063112 (2012) Development of a stable dielectric-barrier discharge enhanced laminar plasma jet generated at atmospheric pressure Appl. Phys. Lett. 100, 253505 (2012) High sensitivity, low noise Mirnov coil array on Prairie View rotamak Rev. Sci. Instrum. 83, 10E304 (2012)
منابع مشابه
Subdominant modes in zonal-flow-regulated turbulence.
From numerical solutions of a gyrokinetic model for ion temperature gradient turbulence it is shown that nonlinear coupling is dominated by three-wave interactions that include spectral components of the zonal flow and damped subdominant modes. Zonal flows dissipate very little energy injected by the instability, but facilitate its transfer from the unstable mode to dissipative subdominant mode...
متن کاملRole of stable eigenmodes in gyrokinetic models of ion temperature gradient turbulence
Investigation of ion temperature gradient turbulence in gyrokinetic models shows that some of the key features of reduced models associated with saturation by nonlinearly excited damped eigenmodes carry over to gyrokinetics. For nonzonal wavenumbers the frequency spectrum in gyrokinetics is broader by a factor of 10 than simple nonlinear broadening of the most unstable eigenmode. The width, inc...
متن کاملInfluence of zonal flows on unstable drift modes in ETG turbulence
The linear instability of the electron temperature gradient (ETG) driven modes in the presence of zonal flows is investigated. Random and deterministic cos like profiles of the zonal flow are considered. It is shown that the presence of shearing by zonal flows can stabilize the linear instability of ETG drift modes. PACS numbers: 52.35.-g, 52.30.-q, 52.55.Fa, 52.35.Kt
متن کاملSmall-scale turbulence in a closed-field-line geometry.
Plasma turbulence due to small-scale entropy modes is studied with gyrokinetic simulations in a simple closed-field-line geometry, the Z pinch, in low-beta parameter regimes that are stable to ideal interchange modes. We find an enormous variation in the nonlinear dynamics and particle transport as a function of two main parameters, the density gradient and the plasma collisionality. This varia...
متن کاملNonlinear damping of plasma zonal flows excited by inverse spectral transfer.
Plasma zonal-flow excitation and saturation in fluid electron-drift-wave turbulence are studied spectrally. The zonal flow is a spectral condensation onto the zero-frequency linear-wave structure. In the representation diagonalizing the wave coupling that dominates interactions at long wavelengths, nonlinear triad interactions involving zero-frequency waves are greatly enhanced. Zonal modes are...
متن کامل