Fokker-Planck formulation for rf current drive, including wave driven radial transport
A toroidal, relativistic, three-dimensional Fokker-Planck model for rf current drive is presented. The model properly accounts for the coupling of radial and velocity space dynamics, as driven by the wave-particle interaction and by collisional scattering (in the weak collisionality, or "banana regime"). The quasilinear rf diffusion tensor (in a three-dimensional constant of motion space) is cast in a form which can be evaluated from ray tracing models. The tensor elements responsible for radial transport effects are separated into classical and neoclassical contributions. The classical contributions are largely driven by the poloidal components of the wave vectors, which are sensitive to toroidal effects as the waves propagate into the plasma. The neoclassical contributions are driven by spatially localised diffusion in energy and pitch-angle. The formulation is intended for numerical simulation of highly non-Maxwellian distribution functions, including wave driven and collisional transport effects.
Bibliographic Reference: Report: EUR-CEA-FC-1431 EN (1991) 15 pp.
Availability: Available from CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR)
Record Number: 199210135 / Last updated on: 1994-12-02
Original language: en
Available languages: en