Monte Carlo simulation studies for ion orbit loss in limiter tokamaks
show a poloidal asymmetry in ion loss arising from differences in ion
orbit geometry. Since electron loss to the limiter is uniformly distri
buted because of its tiny orbit width, the nonuniform ion loss could c
ause a poloidal electric field that would tend to make the ion loss to
the limiter more uniform. A simple analytical derivation of this polo
idal electric field and a discussion of its effects on ion movement an
d transport are also presented.