Observation of toroidal Alfvén eigenmode excited by energetic electrons induced by static magnetic perturbations in the EAST tokamak

• DOI: 10.1088/1741-4326/aad70c
• Publication Date: 2018-07-31T08:45:58Z
• Authors: N. Chu; Y. Sun; S. Gu; H.H. Wang; Y.J. Hu; T.H. Shi; D.L. Chen; X. Gu; K.Y. He; M. Jia; S.Y. Lin; H.Q. Liu; J.P. Qian; J. Ren; B. Shen; A. Ti; S.X. Wang; J.L. Xie; M. Xu; M.M. Xue; N. Yan; Q. Zang; L. Zeng; J.Z. Zhang; T. Zhang; Y. Zhang; G.Q. Zhong; C. Zhou; R.J. Zhou
• Keywords: Diamagnetism

A toroidal Alfvén eigenmode (TAE) excited by barely trapped energetic electrons during the application of a static magnetic perturbations (MPs) is observed for first time in tokamak ohmic heating plasmas. This TAE appears when current n = 2 MPs exceeds threshold value, at which forced reconnection happens. Here, mode number. located near plasma edge, agrees with calculation gap. It propagates ion diamagnetic direction and has dominant number 2. The frequency consistent precessional energy around 150 keV. An increase hard x-ray emission intensity this range just after reconnection. may be accelerated islands formed stabilized reduction contents electrons. observation suggests that provide us novel method to actively control eigenmodes fusion