Turbulent transport provides the main contribution to particle and energy losses in tokamak plasmas, which control is of paramount importance for forthcoming reactors such as the Divertor-Tokamak-Test (DTT) facility under construction at ENEA Frascati. In this work we investigate the characteristic features of drift turbulence at the plasma edge through 3D electro-static fluid simulations. We outline the crucial role of the diffusion coefficient for the emerging turbulent spectra and for the excitation of vortex structures or zonal flows. Moreover, the impact of adding a poloidal magnetic component is also discussed considering a radial shear, and the emergence of anisotropic spectral features in the poloidal plane is emphasized. The analysis is extended to the case with Dirichlet boundary conditions along the radial direction, instead of the periodic ones usually employed in such kind of analyses.
On the tokamak edge turbulence with different magnetic configurations
Montani G.
2025-01-01
Abstract
Turbulent transport provides the main contribution to particle and energy losses in tokamak plasmas, which control is of paramount importance for forthcoming reactors such as the Divertor-Tokamak-Test (DTT) facility under construction at ENEA Frascati. In this work we investigate the characteristic features of drift turbulence at the plasma edge through 3D electro-static fluid simulations. We outline the crucial role of the diffusion coefficient for the emerging turbulent spectra and for the excitation of vortex structures or zonal flows. Moreover, the impact of adding a poloidal magnetic component is also discussed considering a radial shear, and the emergence of anisotropic spectral features in the poloidal plane is emphasized. The analysis is extended to the case with Dirichlet boundary conditions along the radial direction, instead of the periodic ones usually employed in such kind of analyses.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
