Electron Cyclotron Current Drive in High β_p Tokamak Plasmas

摘要

A model equilibrium pertaining to high β_p tokamak plasmas and Lorentz gas model are used in evaluating the electron cyclotron current drive efficiency. The model calculation shows that high β_p will reduce the trapping effects and increase the off-axis current drive efficiency for all parameter regimes of interest. Enhancement of the current drive efficiency can be significant in the case of strong trapping and near the equilibrium β_p limit.