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In this study, we discover a turbulence transition and its role in the isotope effects in the Large Helical Device (LHD). The turbulence levels and turbulence-driven transports decrease with an increa...se in the electron density to a specific density; however, they increase in regimes above the density. Density scan experiments and gyrokinetic/MHD simulations reveal that the observed ion-scale turbulence is the ion-temperature gradient (ITG) turbulence below the density and resistive-interchange (RI) above the density. Negligible isotope effects in the turbulences and transports of hydrogen (H) and deuterium (D) plasma were found in the ITG regime. However, clear isotope effects were observed in the RI regime. In the RI regime, the turbulences and transports were clearly suppressed, and the confinements were improved in D plasma. The reduction of the turbulence level in the RI regime of the D plasma is likely due to the heavier ion mass and lower resistivity in D plasma, which suppress the linear growth rate of RI turbulence.続きを見る
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