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Title: High frequency fishbone driven by passing energetic ions in tokamak plasmas

High frequency fishbone instability driven by passing energetic ions was first reported in the Princeton beta experiment with tangential neutral-beam-injection (Heidbrink et al 1986 Phys. Rev. Lett. 57 835–8). It could play an important role for ITER-like burning plasmas, where α particles are mostly passing particles. In this work, a generalized energetic ion distribution function and finite drift orbit width effect are considered to improve the theoretical model for passing particle driving fishbone instability. For purely passing energetic ions with zero drift orbit width, the kinetic energy $$\delta {{W}_{k}}$$ is derived analytically. The derived analytic expression is more accurate as compared to the result of previous work. For a generalized energetic ion distribution function, the fishbone dispersion relation is derived and is solved numerically. As a result, numerical results show that broad and off-axis beam density profiles can significantly increase the beam ion beta threshold $${{\beta}_{c}}$$ for instability and decrease mode frequency.
 [1] ;  [2] ;  [3] ;  [4]
  1. Dalian Univ. of Technology, Dalian (People's Republic of China); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. East China Univ. of Science and Technology, Shanghai (People's Republic of China)
  3. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Zhejiang Univ., Hangzhou (People's Republic of China)
  4. Chinese Academy of Sciences (CAS), Hefei (China)
Publication Date:
Grant/Contract Number:
AC02-09CH11466; 2014M561218; 11205060; 11605245; 11505022; 11375029
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 57; Journal Issue: 5; Journal ID: ISSN 0029-5515
IOP Science
Research Org:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org:
Country of Publication:
United States
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; fishbone; passing particle; EPM; tokamak
OSTI Identifier: