Plasma Shapes for Achieving High Heating Efficiency during Neutral Beam Injection in Doublet III

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Abstract
Three plasma configurations have been compared for achieving an improved heating efficiency (H-mode) during the neutral beam injection phase. The H-mode plasmas are observed only in divertor configurations. The highly elongated divertor shape has achieved H-mode plasmas with the best heating efficiency. Required beam power for achieving these plasmas increases from ∼1 MW to ∼4 MW as the plasma current increases from 360 kA to 740 kA. The stored plasma energy increases as the plasma current increases and improves 50% over that in low heating efficiency (L-mode) at the best H-mode discharges.