Suppression of Tilting Instability of a Compact Torus by Energetic Particle Beams

It is shown that the tilting motion of a compact torus can be stabilized by toroidally circulating energetic particle beams. The required beam current relevant to tilt stability is estimated to be sufficiently small compared to the plasma current if the circulation frequency of beam particles is close to the betatron frequency. As an example, this stabilizing method is applied to a field reversed configuration. Effects of the plasma surface current and beam divergences are also examined.