Global saturation physics of ion temperature gradient turbulence in finite normalized pressure tokamaks

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...

Gyrokinetic Particle-In-Cell Global Simulations of Ion-Temperature-Gradient and Collisionless-Trapped- Electron-Mode Turbulence in Tokamaks

The goal of thermonuclear fusion research is to provide power plants, that will be able to produce one gigawatt of electricity. Among the different ways to achieve fusion, the tokamak, based on magnetic confinement, is the most promising one. A gas is heated up to hundreds of millions of degrees and becomes a plasma, which is maintained or confined in a toroidal vessel by helical magnetic field...

Understanding nonlinear saturation in zonal-flow-dominated ion temperature gradient turbulence

We propose a quantitative model of ion temperature gradient driven turbulence in toroidal magnetized plasmas. In this model, the turbulence is regulated by zonal flows, i.e. mode saturation occurs by a zonal-flow-mediated energy cascade (‘shearing’), and zonal flow amplitude is controlled by nonlinear decay. Our model is tested in detail against numerical simulations to confirm that both its as...

Ion temperature gradient driven turbulence with strong trapped ion resonance

Momentum transport in the vicinity of qmin in reverse shear tokamaks due to ion temperature gradient turbulence

due to ion temperature gradient turbulence Rameswar Singh, R Singh, Hogun Jhang, and P. H. Diamond Institute for Plasma Research, Bhat, Gandhinagar 382 428, India Laboratoire de Physique des Plasmas, Ecole Polytechnique route de Saclay, 91128 Palaiseau Cedex, France WCI Center for Fusion Theory, National Fusion Research Institute, Daejeon 305-333, South Korea Center for Momentum Transport and F...