Nonlinear Phenomena in Microphysics of Collisionless Plasmas. Application to Space and Laboratory Plasmas
J. Phys. IV France 05 (1995) C6-105-C6-108
Direct Numerical Simulations of Two-Fluid Plasma TurbulenceA. Thyagaraja
UKAEA Government Division, Fusion, Culham, Abingdon, 0X14 3DB, U.K. (UKAEA/EURATOM Fusion Association)
Electromagnetic turbulence thought to be responsible for anomalous transport in magnetic confinement devices such as tokamaks is very complicated, involving a multitude of physical processes, length and time-scales. It cannot be investigated by traditional linear theories any more than aerodynamic fluid turbulence. The relatively longer wavelength (k⊥pi<<1), low frequency (ω≈ω*<<ωci) drift-type modes are, however, susceptible to a direct numerical solution approach pioneered in the case of fluid turbulence by Orszag and Patera. A substantial two-fluid nonlinear code called CUTIE has been developed at Culham in recent years to study the nonlinear saturation and transport consequences of electromagnetic drift wave turbulence in simplified tokamak geometry. This development and some results obtained using such a model are briefly described in this contribution.
© EDP Sciences 1995