Classical and non-classical confinement properties of energetic ions on LHD

The confinement properties of tangentially injected energetic particles are experimentally investigated on the Large Helical Device (LHD). The local confinement times of energetic particles are evaluated by experiments and have good correlation with pitch-angle scattering times in the core region and with charge exchange loss times in the edge regions. Thus, the classical process is considered to be the dominant process of the energetic particle confinement on LHD. In addition to these classical effects, the enhanced energetic particle transports induced by MHD-instabilities are observed on LHD. These effects become significant at low magnetic field (Bt<∼0.75) configurations. (author)