Critical velocity shear flow for triggering L-H transition and its parametric dependence in the HL-2A tokamak. (21st July 2020)

• Record Type: Journal Article
• Authors: Liang, A.S.; Zou, X.L.; Zhong, W.L.; Ekedahl, A.; Duan, X.R.; Shi, Z.B.; Yu, D.L.; Yang, Z.C.; Wen, J.; Xiao, G.L.; Han, M.K.; Li, J.; Zhang, X.R.; Jiang, M.; Shi, P.W.; Fang, K.R.; He, X.X.; Chen, W.; Song, X.M.; Yan, L.W.; Liu, Y.; Yang, Q.W.; Dong, J.Q.; Ding, X.T.; Xu, M.
• Is Part Of: Nuclear fusion. Volume 60:Number 9(2020)
• Publication Date: 2020-07-21
• Subjects: L-H transition -- velocity shear -- turbulence; Nuclear fusion -- Periodicals; 621.48405
• DOI: 10.1088/1741-4326/ab9883
• Languages: English
• ISSNs: 0029-5515

Abstract

Abstract: The dynamics of shear flows and turbulence in the pedestal region during the L-H transition have been studied in the HL-2A tokamak. It has been shown that ion diamagnetic shear flow plays a key role in triggering the L-H transition. A critical E × B velocity shear has been found for the L-H transition. Statistical results indicate that the velocity shear threshold is independent of the plasma density and the total heating power.