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Beam ion losses due to energetic particle geodesic acoustic modes

  • Author(s): Fisher, RK
  • Pace, DC
  • Kramer, GJ
  • Van Zeeland, MA
  • Nazikian, R
  • Heidbrink, WW
  • García-Muñoz, M
  • et al.

We report the first experimental observations of fast-ion loss in a tokamak due to energetic particle driven geodesic acoustic modes (EGAMs). A fast-ion loss detector installed on the DIII-D tokamak observes bursts of beam ion losses coherent with the EGAM frequency. The EGAM activity results in a significant loss of beam ions, comparable to the first orbit losses. The pitch angles and energies of the measured fast-ion losses agree with predictions from a full orbit simulation code SPIRAL, which includes scattering and slowing-down. © 2012 IAEA, Vienna.

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