The Reynolds stress induced by weakly up-down asymmetric ion temperature gradient mode

Zonal flow generation in ion temperature gradient mode turbulence

In the present work the zonal flow ~ZF! growth rate in toroidal ion-temperature-gradient ~ITG! mode turbulence including the effects of elongation is studied analytically. The scaling of the ZF growth with plasma parameters is examined for typical tokamak parameter values. The physical model used for the toroidal ITG driven mode is based on the ion continuity and ion temperature equations where...

Up-down asymmetric tokamaks

Stability of the ion-temperature-gradient-driven mode with negative magnetic shear

Quasilinear analysis of the zonal flow back - reaction on ion - temperature - gradient mode tur - bulence

There is strong evidence in favor for zonal flow suppression of the Ion-Temperature-Gradient (ITG) mode turbulence, specifically close to the linear stability threshold. The present letter attempts to analytically calculate the effects of zonal flow suppression of the ITG turbulence through deriving a modified dispersion relation including the back-reaction of the zonal flows on the ITG turbule...

Shear induced Reynolds stress at the edge of L-mode tokamak plasmas

The turbulent flux of momentum or Reynolds stress is a mechanism responsible for the generation of sheared flow by turbulence. The structure of the flux surface averaged stress 〈ṽrṽ⊥〉 is investigated in the edge region of a L-mode tokamak plasma. The stress induced by the perpendicular tilting of ballooning modes is considered. Besides the tilting by the E×B flow shear, which is a negative visc...