• Theory

    Understanding and predicting transport of particles, momentum and energy across the magnetic field in magnetically confined toroidal plasmas is of the utmost importance in the fusion energy program for an obvious reason: the highest the transport level, the lower the confinement time. Hence, relevant progress in the comprehension of transport phenomena will surely have an …

  • Gyrokinetic simulations

    Gyrokinetic theory represents a significant step towards achieving accurate simulations of microturbulence in magnetized plasmas [Garbet-10]. The periodic motion of a charged particle around the magnetic field line is averaged out rigorously, keeping the effect of the small Larmor radius.  In this way the computing resources required are largely reduced. This allows accurate simulations of microturbulence of spatial …

  • Neoclassical simulations

    Neoclassical theory [Galeev-68, Hinton-76] sets a lower bound on transport in toroidal plasmas. In the case of three-dimensional devices, neoclassical transport may become even dominant as the temperature of the plasma increases, due to the unfavorable temperature scaling of the transport coefficients. Hence, the comprehensive study of neoclassical transport is a necessary condition for both …

  • Experiments

    The ultimate goal of our Theory and Simulation activities is to understand what is observed in experiments, specifically in the TJ-II stellarator device. Some of the measurements we would like to improve our understanding of are Decay of Zonal flow-like structures detected with double Langmuir probe systems. These turbulence-generated, global ExB rotation patterns are thought to …