• First deuterium beam operation was initiated in LHD-NBI in

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Presentation transcript:

• First deuterium beam operation was initiated in LHD-NBI in 2017. FIP/P1-54 Exploring Deuterium Beam Operation and Behavior of Co-Extracted Electron in Negative-Ion-Based Neutral Beam InjectoR K. IKEDA and LHD-NBI Team National Institute for Fusion Science (NIFS), National Institutes of Natural Sciences, Toki, Japan • First deuterium beam operation was initiated in LHD-NBI in 2017. •The deuterium negative ion current (ID-) reaches 46.2 A with the averaged current density being 190A/m2 , and the electron-ion current ratio (Ie/ID-) increases to 0.39 using 5.6 V high bias voltage to reduce electron contamination in the beam. • Linear dependence of the minimum value of the Ie/ID- on the arc-discharge power is found, and is stronger in the D– operation than Ie/IH- in the hydrogen operation. • Increase of electron density in the vicinity of the plasma grid surface is confirmed by half-sized research negative ion source in the test stand in NIFS (NBTS).