Observation of Fast Ion Losses Induced by Various MHD Modes Driven by Fast Ions and Bulk Plasma Pressure in the Large Helical Device

Kunihiro OGAWA; Mitsutaka ISOBE; Kazuo TOI; LHD Experiment Group

doi:10.1585/pfr.4.033

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Observation of Fast Ion Losses Induced by Various MHD Modes Driven by Fast Ions and Bulk Plasma Pressure in the Large Helical Device

Kunihiro OGAWA, Mitsutaka ISOBE, Kazuo TOI, LHD Experiment Group

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Keywords: lost-ion probe, fast ion, scintillator, TAE (toroidal Alfvén eigenmode), EPM (energetic-particle continuum mode), interchange mode, LHD (Large Helical Device)

JOURNAL FREE ACCESS

2009 Volume 4 Pages 033

DOI https://doi.org/10.1585/pfr.4.033

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Abstract

Results from a scintillator-based lost-fast ion probe newly installed at the horizontally elongated outboard side of the Large Helical Device are presented. Correlating with bursts of toroidal Alfvén eigenmodes (TAEs) and energetic-particle continuum modes (EPMs), recurrent increases in beam ion losses were observed during co-neutral beam injections. Beam ion loss rate was also enhanced, correlating with low-frequency interchange modes driven by the bulk plasma pressure gradient near the plasma edge.

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