Energetic-particle-driven global instabilities in helical plasmas and comparison with tokamak plasmas

Abstract

Similarities and differences in energetic-particle-driven global instabilities such as Alfvén eigenmodes and their consequences for helical/ stellarator and tokamak plasmas are discussed through comparison with the data obtained in the Large Helical Device (LHD). In particular, this lecture stresses on the differences caused by the variations on the rotational transform profile and the two-dimensional or three-dimensional geometrical structure of the plasma equilibrium. Important and interesting issues left for future study are listed up.