Investigation of the role of fishbone activity in the formation of internal transport barrier in HL-2A plasma

Wei Deng,Y. Liu, W. L. Ge,Min Jiang,Z. B. Shi,Dong Li, X. Q. Ji, Y. B. Dong,Feng Wang, J. Y. Cao, W. L. Zhong, J. M. Gao, Yi Po Zhang,Yong Gao Li, Z. X. Wang,Min Xu, X. R. Duan

Physics of Plasmas(2022)

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摘要
A tokamak scenario with q(0) close to 1 has been achieved on HL-2A tokamak, which is an internal transport barrier (ITB) at low central shear or a steady-state ITB combined with an H-mode edge barrier. In this scenario, the formation of an ITB with a steep ion temperature profile is observed to be closely linked to the q = 1 magnetic surface and magnetohydrodynamic (MHD) activities around it, such as long-lived mode (LLM) or fishbone activities. Experimental evidence and simulation analysis suggest that the fishbone activities can induce a poloidal flow, which is beneficial for the suppression of turbulence in the plasma core region. Furthermore, an application of central electron cyclotron resonance heating (ECRH) to such beam-heated weak shear ITB discharges leads to a substantial effect on central MHD stability, converting the LLM into fishbone activity and hence enhancing the strength of the ITB with a much stronger gradient. Moreover, ITBs in combination with an H-mode barrier were achieved for 10 confinement times with βN = 2.0.
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关键词
internal transport barrier,plasma,fishbone activity
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