I. Katsunori

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Transition from the ion root to the electron root in neutral beam heated plasmas was observed in the Large Helical Device for the first time. The measured values of the radial electric field were found to agree well with those estimated by neoclassical theory. The pedestal configuration, which is characterized by a high edge temperature gradient, was(More)
We study the properties of non-inductive current in LHD experiments. The experimentally observed dependence on the plasma stored energy and the magnetic axis position agrees with a theoretical prediction based on bootstrap current under NB balanced injection. We apply a calculation model of time evolution in toroidal current profile based on bootstrap(More)
Experiments in LHD have been developing steadily since the first plasma in 1998. Many encouraging physical achievements have emerged during five experimental campaigns. The most significant finding is that MHD stability and good transport are compatible in the inward shifted configuration. Within the range of beta up to 3Vo and the collisionality down to(More)
Long-pulse neutral beam heating has been achieved in the Large Helical Device (LHD), with a negative-ion-based neutral beam injector (NBI). The pulse duration ofthe neutral-beam-heated discharge is extended easily without special feedback stabilization for plasma control. As a result, a hightemperature (1.5-1.8 keV) plasma with a density of (1.5 2.0 x 10re(More)
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