A compact stellarator-tokamak hybrid

Tokamaks and stellarators are the leading two magnetic confinement devices for producing fusion energy, begging the question of whether the strengths of the two could be merged into a single concept. To meet this challenge, we propose a first-of-its kind optimized stellarator-tokamak hybrid. Compared to a typical tokamak coil set, only a single simple type of stellarator coil has to be added which leads to a compact, volume- and transport-preserving magnetic field, with an added rotational transform that reaches levels thought to enhance stability.