Short wavelength ion temperature gradient turbulence

Ion temperature gradient driven turbulence with strong trapped ion resonance

Critically balanced ion temperature gradient turbulence in fusion plasmas.

Scaling laws for ion temperature gradient driven turbulence in magnetized toroidal plasmas are derived and compared with direct numerical simulations. Predicted dependences of turbulence fluctuation amplitudes, spatial scales, and resulting heat fluxes on temperature gradient and magnetic field line pitch are found to agree with numerical results in both the driving and inertial ranges. Evidenc...

Global gyrokinetic ion temperature gradient turbulence simulations of ITER

Global gyrokinetic simulations of ion temperature gradient (ITG) driven turbulence in an ideal MHD ITER equilibrium plasma are performed with the ORB5 code. The noise control and field-aligned Fourier filtering procedures implemented in ORB5 are essential in obtaining numerically healthy results with a reasonable amount of computational effort: typical simulations require 109 grid points, 109 p...

Numerical Convergence of Gyrokinetic Simulations of Ion-temperature-gradient Turbulence

We examine the convergence of particle-based nonlinear \gyrokinetic simulations" of ion-temperature-gradient (ITG) turbulence [1] with respect to numerical parameters. Our main focus is on convergence with respect to particle number, both through direct particle number scans and through \scrambling tests" that determine the relative e ect of the noise due to particle discreteness. Results will ...

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...