A study of beam ion and deuterium–deuterium fusion-born triton transports due to energetic particle-driven magnetohydrodynamic instability in the large helical device deuterium plasmas

Abstract Understanding energetic particle transport due to magnetohydrodynamic instabilities excited by particles is essential apprehend alpha confinement in a fusion burning plasma. In the large helical device (LHD), beam ion and deuterium–deuterium fusion-born triton resistive interchange mode destabilized helically-trapped ions (EIC) are studied employing comprehensive neutron diagnostics, such as flux monitor newly developed scintillating fiber detector characterized high detection efficiency. Beam EIC deuterium plasmas with full or hydrogen/deuterium injections. The total emission rate ( S n ) measurement indicates that induces about 6% loss of passing transit 60% ions. ions, which drive EIC, larger than Furthermore, drop increasing linearly amplitude shows barely confined existing near confinement-loss boundary lost EIC. conditions, study performed time-resolved secondary deuterium–tritium n_DT ). Drop increases substantially third power reaches up 30%. relation not only tritons confined-loss boundary, but also inner region plasma, transported.