Status and comparison of codes used for fast wave current drive

The status of computer models for fast wave current drive in the ion cyclotron range of frequencies is reviewed in this paper. The treatments of wave propagation, wave absorption, and current drive efficiency in the various models are discussed and the important physics issues in each of these areas are emphasized. The predictions for electron heating and current drive among these models is reviewed, especially as related to the recent DIII-D fast wave experiments and to the proposed Tokamak Physics Experiment (TPX). Finally, areas requiring further research in these models will be identified