ExB advection of trace ions in tokamak microturbulence
- Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, 85748 Garching (Germany)
The ExB advection of trace ions in realistic tokamak microturbulence (as described by nonlinear gyrokinetics) is investigated. In order to understand the consequences of effects such as large gyroradii, fluctuation anisotropies, zonal flows, or poloidal drifts, they are first studied in the framework of a model that is based on self-created stochastic potentials. Direct numerical simulations are performed, and a semi-analytical model is presented that provides qualitative as well as quantitative insight into the nature of passive tracer transport. One finds that the resulting diffusivities may be larger than expected as long as the gyroradii do not exceed the turbulence correlation length(s) and the poloidal drift velocities are sufficiently small.
- OSTI ID:
- 21069824
- Journal Information:
- Physics of Plasmas, Vol. 14, Issue 9; Other Information: DOI: 10.1063/1.2768025; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Turbulent ExB advection of charged test particles with large gyroradii
The effect of plasma shaping on turbulent transport and ExB shear quenching in nonlinear gyrokinetic simulations