Stimulated effect of SMBI on low-to-high confinement transition of tokamak plasmas
| Autor: | B.B. Feng, Z. X. Wang, K.R. Fang, G.Z. Hao, X.T. Ding, P.W. Shi, M. Xu, X.M. Song, X.R. Duan, C.Y. Chen, G.L. Xiao, J. Wen, L.W. Yan, M. Jiang, A.S. Liang, W.W. Xiao, X.L. Zou, Yi Liu, J. Yin, X.Q. Ji, Z.B. Shi, Wulyu Zhong, D.L. Yu, J.Q. Dong, Q.W. Yang, Z.C. Yang, W. Chen |
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| Rok vydání: | 2020 |
| Předmět: |
Nuclear and High Energy Physics
Tokamak Materials science Turbulence Flow (psychology) Plasma Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas Computational physics law.invention Physics::Fluid Dynamics Shear (sheet metal) law 0103 physical sciences Turbulence kinetic energy Supersonic speed 010306 general physics Molecular beam |
| Zdroj: | Nuclear Fusion. 60:082002 |
| ISSN: | 1741-4326 0029-5515 |
| DOI: | 10.1088/1741-4326/ab868d |
| Popis: | The impact of supersonic molecular beam injection (SMBI) fuelling on plasma turbulence and shear flows, which forms a self-consistent state, has been studied in the HL-2A tokamak. The SMBI flattens the shear layer by collisional flow damping and increases the turbulence intensity. It is found that the SMBI can enhance the nonlinear regulation dynamics and acts as an external tool for turbulence quench via stimulating two dynamic processes. The SMBI-stimulated nonlinear interactions facilitate the L-H transition at the marginal heating power for accessing the H-mode. The effective reduction of the H-mode power threshold by SMBI is demonstrated. The result suggests that the SMBI could be a general tool for realization of controllable L-H transition via reducing the H-mode power threshold in future devices. |
| Databáze: | OpenAIRE |
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