Journal of the Korean Physical Society

, Volume 72, Issue 6, pp 669–675 | Cite as

Fishbone Oscillations in the Experimental Advanced Superconductivity Tokamak

  • Li-Qing Xu
  • Li-Qun Hu
  • Yi Yuan
  • Ying-Ying Li
  • Guo-Qiang Zhong
  • Hai-Qing Liu
  • Kai-Yun Chen
  • Tong-Hui Shi
  • Yan-Min Duan
Article
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Abstract

A fishbone oscillation was observed in the neutral beam injection plasma at Experimental Advanced Superconductivity Tokamak (EAST). This m = 1/n = 1 (m, n: poloidal, toroidal mode numbers, respectively) typical internal kink mode travels in the ion-diamagnetism direction in the poloidal section with a rotation speed close to the ion diamagnetic drift frequency. A high thermal plasma beta and high amounts of energetic ions are necessary for the mode to develop. Fishbone oscillations can expel heavy impurities in the core, which favors sustaining a high-performance plasma. The born frequency of the fishbone oscillation is the ion diamagnetic drift frequency and the chirping down of the frequency during the initial growth phase is the result of a drop in iondiamagnetic drift frequency. The excitation energy is thought to be due to the thermal plasma pressure gradient; however, the development of a fishbone oscillation is related to energetic ions.

Keywords

Fishbone oscillation Energetic ions EAST 
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Copyright information

© The Korean Physical Society 2018

Authors and Affiliations

  • Li-Qing Xu
    • 1
  • Li-Qun Hu
    • 1
  • Yi Yuan
    • 1
  • Ying-Ying Li
    • 1
  • Guo-Qiang Zhong
    • 1
  • Hai-Qing Liu
    • 1
  • Kai-Yun Chen
    • 1
  • Tong-Hui Shi
    • 1
  • Yan-Min Duan
    • 1
  1. 1.Institute of Plasma PhysicsChinese Academy of SciencesHefeiChina

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