Turbulence Transition in Magnetically Confined Hydrogen and Deuterium Plasmas.
Phys Rev Lett
; 132(23): 235101, 2024 Jun 07.
Article
em En
| MEDLINE
| ID: mdl-38905665
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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MEDLINE
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Ano de publicação:
2024
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Article