High-β scenario realized by the integration of internal and external transport barriers in the HL-2A tokamak

• DOI: 10.1016/j.physleta.2022.128141
• Publication Date: 2022-04-13T11:57:53Z
• Authors: W. Chen; L.M. Yu; M. Xu; Z.B. Shi; X.X. He; D.L. Yu; X.Q. Ji; Y.G. Li; M. Jiang; P.W. Shi; Z.J. Li; J. Li; Z.X. Wang; J.Y. Cao; X.Y. Bai; X.T. Ding; J.Q. Li; W.L. Zhong; X.R. Duan
• Keywords: Pedestal; DIII-D; Fusion power

High-βp scenario addresses needs for an attractive tokamak fusion reactor design, where βp is the normalized plasma poloidal beta. experiments have been performed during recent years in HL-2A tokamak. The high-performance region realized by integration of internal and external transport barriers which are dubbed as ITBs ETBs, namely, double (DTBs), with high-power NBI heating. Generally, ITB forms becomes strong after injection on HL-2A. Subsequently, edge ion temperature toroidal rotation increase, a result that ETB or pedestal creates L-H transition occurs. A high-βp (βp∼3) obtained Ip∼110 kA q95∼5, another (βp∼2.7) also Ip∼160 q95∼4.2. two scenarios both characterized large-radius ETB. However, different. For former there weak radial profiles, but later Although accessed, however they transient. In addition, MHD instabilities present high gain relevant fusion-density plasma.