Turbulence Transition in Magnetically Confined Hydrogen and Deuterium Plasmas

作     者：T. Kinoshita K. Tanaka A. Ishizawa H. Sakai M. Nunami Y. Ohtani H. Yamada M. Sato M. Nakata T. Tokuzawa R. Yasuhara Y. Takemura I. Yamada H. Funaba K. Ida M. Yoshinuma T. Tsujimura R. Seki K. Ichiguchi C. A. Michael 

作者机构：Research Institute for Applied Mechanics Interdisciplinary Graduate School of Engineering Sciences  National Institutes on Natural Sciences Toki Gifu 509-5292 Japan Graduate School of Energy Science Graduate School of Science  Naka Ibaraki 311-0193 Japan Graduate School of Frontier Sciences  SOKENDAI Toki Gifu 509-5292 Japan Department of Physics and Astronomy 

出 版 物：《Physical Review Letters》 (Phys Rev Lett)

年 卷 期：2024年第132卷第23期

页      面：235101-235101页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：Japan Society for the Promotion of Science, JSPS, (21H04458, 21J12314, 16H04620) Japan Society for the Promotion of Science, JSPS National Institute for Fusion Science, NIFS, (22ULHH013, 18ULHH013, 20ULHH013, 19ULHH013, 21ULHH013) National Institute for Fusion Science, NIFS U.S. Department of Energy, USDOE, (DE-SC0019007) U.S. Department of Energy, USDOE 

主　　题：Magnetic confinement fusion Plasma fusion Plasma turbulence Turbulence control Magnetically confined plasmas Stellarators & toroidal confinement devices 

摘      要：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.