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Transport of energetic ions due to sawteeth, Alfvén eigenmodes and microturbulence

  • Author(s): Pace, DC
  • Fisher, RK
  • García-Mũoz, M
  • Heidbrink, WW
  • McKee, GR
  • Murakami, M
  • Muscatello, CM
  • Nazikian, R
  • Park, JM
  • Petty, CC
  • Rhodes, TL
  • Staebler, GM
  • Van Zeeland, MA
  • Waltz, RE
  • White, RB
  • Yu, JH
  • Zhang, W
  • Zhu, YB
  • et al.
Abstract

Utilizing an array of new diagnostics and simulation/modelling techniques, recent DIII-D experiments have elucidated a variety of energetic ion transport behaviour in the presence of instabilities ranging from large-scale sawteeth to fine spatial scale microturbulence. Important new insights include sawteeth, such as those of the ITER baseline scenario, causing major redistribution of the energetic ion population; high levels of transport induced by low-amplitude Alfvén eigenmodes can be caused by the integrated effect of a large number of simultaneous modes; and microturbulence can contribute to the removal of alpha ash while having little effect on fusion alphas. This paper provides an overview of recent and upcoming results from the DIII-D Energetic Particles research programme. © 2011 IAEA, Vienna.

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