3D bounce averaged Fokker-Planck calculation of electron cyclotron current drive efficiency

Construction of comprehensive models for tokamak electron cyclotron heating and current drive is motivated by the increasing level of experimental activity in this area. A code has been assembled which predicts the profiles of heating and current drive, the global current drive efficiency, and diagnostic signals which depend upon profiles, such as soft x-ray (SXR) and electron cyclotron emission (ECE). By running an array of two dimensional, bounce averaged Fokker-Planck/quasilinear (FP/QL) codes on a set of flux surfaces parameterized by minor radius r we obtain the steady state, toroidally averaged electron distribution functions resulting from a balance between collisions and QL diffusion. The incoming rf energy is damped consistent with the QL distortion of the distribution functions at each point in the tokamak. Heat thereby given to the electrons is removed by linearizing the Coulomb collision operator about a background Maxwellian distribution. Plasma density and temperature vary parabolically in the radial direction. The vertically delimited channel of ECH energy may be injected from the inside or from the outside; its frequency ω equals the electron cyclotron frequency ω/sub ce/(R) at the cyclotron layer