A Quasilinear Fokker Planck Code For The Numerical-Solution Of The Lower-Hybrid Current-Drive Problem In The Presence Of Electron-Cyclotron Heating

The finite element library PDE-PROTRAN is applied for the numerical solution of a quasilinear two-dimensional Fokker-Planck equation to study the cross-effect of electron cyclotron heating and lower-hybrid current drive in tokamak plasmas. Results show that the current drive efficiency of EC waves interacting with the LH waves is higher than that of LH waves alone. The results complement previously published results on this problem. In particular, a representation of the hot population produced by EC waves, better than what has been previously published, is obtained.