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Updated: Jun 23, 2025

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
Published on: August 1, 2017
Turbulence Transition in Magnetically Confined Hydrogen and Deuterium Plasmas
T Kinoshita1, K Tanaka2,3, A Ishizawa4
1Research Institute for Applied Mechanics, <a href="https://ror.org/00p4k0j84">Kyushu University</a>, Kasuga, Fukuoka 816-8580, Japan.
Abstract:
In this study, we discovered a turbulence transition in a large helical device. The turbulence level and turbulence-driven energy transport decrease to a specific transition density and increase above it. The ruling turbulences below and above the transition density were ion-temperature gradient (ITG) and resistive-interchange (RI) turbulences, consistent with the predictions of gyrokinetic theory and two-fluid MHD model, respectively. Isotope experiments on hydrogen (H) and deuterium (D) clarified the role of transitions. In the ITG regime, turbulence levels and energy transport were comparable in the H and D plasmas. In contrast, in the RI regime, they were clearly suppressed in the D plasma. The results provide crucial knowledge for understanding isotope effects and future optimization of stellarator and heliotron devices.
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