On drift theory of motion of charged particles in Tokamaks

The authors consider the second order drift theory approximation for charged particle motion in a Tokamak; the second order term describing inertial drift is used. It is shown that this drift increases the maximum displacement of trapped particles if the electric drift velocity VE>0, and decreases it if VE<0. The considered effect is completely caused by the toroidal effects of the magnetic field, and depends on the Tokamak safety factor.