Nonlinear Entropy Transfer in ETG-TEM Turbulence via TEM Driven Zonal Flows
نویسندگان
چکیده
منابع مشابه
Collisional damping of ETG-mode-driven zonal flows.
We study collisional damping of electron zonal flows in toroidal electron temperature gradient (ETG) turbulence due to the friction between trapped and untrapped electrons. With the assumption of adiabatic ions, the collisional damping is shown to occur on fast time scales approximately 0.24epsilon(1/2)tau(e). The comparison with the growth rate of electron zonal flows indicates that the sheari...
متن کاملIsotope effects on turbulent transport and entropy transfer processes in toroidal plasmas
In this article, additional discussions on the nonlinear entropy transfer between turbulence and zonal flows are given for the isotope ion mass effects on the trapped-electron-mode (TEM) driven turbulent transport shown in Ref. 1. Spectral analyses with the triad entropy transfer function reveal that the case with heavier isotope ions indicates a relatively smaller negative transfer (from zonal...
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 کاملNonlinear saturation of collisionless trapped electron mode turbulence: zonal flows and zonal density
Gyrokinetic δf particle simulation is used to investigate the nonlinear saturation mechanisms in collisionless trapped electron mode (CTEM) turbulence. It is found that the importance of zonal flow is parameter sensitive and is well characterized by the shearing rate formula. The effect of zonal flow is empirically found to be sensitive to temperature ratio, magnetic shear and electron temperat...
متن کاملZonal Flows and Electromagnetic Drift Wave Turbulence
Detailed computations of tokamak edge turbulence in three dimensional, globally consistent flux tube geometry show an inhibition of the standard scenario in which zonal ExB flows generated by the turbulence should lead to transport barrier formation. It is found by comparison to slab geometry and by analysis of the energetics that the zonal flow energy is depleted by toroidal coupling to the pr...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Plasma and Fusion Research
سال: 2015
ISSN: 1880-6821
DOI: 10.1585/pfr.10.1403047