TRAPPED ELECTRON CORRECTION TO BEAM DRIVEN CURRENT IN GENERAL TOKAMAKEQUILIBRIA

In the limit that the electron thermal velocity greatly exceeds the fa st ion velocity for electrical currents driven by neutral beams, the t rapped electron correction to the Ohkawa current and the electron dens ity gradient contribution to bootstrap current are shown to share the same transport coefficient in the banana regime. Therefore, existing a nalytic expressions for the bootstrap coefficient valid for arbitrary aspect ratio tokamaks can also be used to calculate the trapped electr on effect. (C) 1997 American Institute of Physics. [S1070-664X(97)0161 1-X].