Abstract
A cylindrical carbon pellet with a size of 1.0 mmφ × 1.0 mmL was injected into low-density (ne =0.3−0.5 × 1013 cm-3) neon-seeded NBI plasmas of the Large Helical Device (LHD). When the two NBI beam pulses were delayed just after the pellet injection, a large increment of central ion temperature up to5 keV was observed with the appearance of a peaked density profile (ne0/〈ne〉∼2.5) and enhanced toroidal rotation speed up to 35 km/s. Improvement of the ion transport is expected with the suggestion of a new operational scenario for confinement improvement in the LHD.
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