Gyrokinetic Global Simulations of Burning Plasmas
Presenter
DescriptionThe creation and control of burning plasmas is an ultimate goal of magnetic fusion world-wide efforts. One of the characteristic features of such plasmas is the intrinsic richness of their physics featuring complex couplings and interactions of microscopic turbulence with macroscopic MHD and Alfvén modes. In burning plasmas, such couplings may become especially strong since fast particles are abundant and can drive the macroscopic modes unstable. A global approach is needed to assess the physics combining the macroscopic modes and turbulence. The global gyrokinetic particle-in-cell codes ORB5 and EUTERPE have been used to simulate the electromagnetic turbulence in the toroidal geometries of axisymmetric tokamaks and the more general stellarators. The so-called ITG-KBM transition has been identified and the relaxation of the profiles has been observed in a circular cross-section tokamak plasma and in the ASDEX-Upgrade geometry. The multiscale physics has been addressed, showing the coupling of electromagnetic turbulence to the collisionless tearing instability and Alfvén modes destabilized by fast ions. Electromagnetic turbulence has also been addressed in the stellarator Wendelstein 7-X geometry. It has been demonstrated that such simulations are possible using existing global gyrokinetic particle-in-cell codes on the HPC systems already available via PRACE.
TimeWednesday, June 2912:00 - 12:30 CEST
LocationDarwin Room
SessionMS5G - High Performance Computing in Kinetic Simulations of Plasmas - Part II: Physics Applications
Session Chair
Event Type
Minisymposium
Computer Science and Applied Mathematics
Physics
Authors
