Toroidal Alfven eigenmodes (TAEs) of low toroidal mode number, n = 1 and 2,
an observed in neutral-beam-heated plasmas in the compact helical system h
eliotron/torsatron. The observed frequency is proportional to the computed
TAE frequency and lies near the lower bound of the innermost TAE gap. The m
odes are excited only when the beam velocity exceeds about half the central
Alfven velocity and when the net plasma current induced by coinjected neut
ral beams is in the required range. The modes are localized in the plasma c
ore region, between 0.2 and 0.6 of the plasma minor radius.