SUPERBANANA ORBITS IN STELLARATOR GEOMETRIES

The presence of superbanana orbits localized to either the interior or the exterior of classical stellarators and torsatrons is investigated for 3.5-MeV α particles. The absence of the interior superbanana in both geometries is found to be related to nonconservation of the action. Exterior superbananas are found in the stellarator only, as a consequence of the existence of absolute localized magnetic wells. No superbananas of either type are found in the torsatron. © 1979 The American Physical Society.