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Doppler-shifted cyclotron resonance of fast ions with circularly polarized shear Alfvén waves

  • Author(s): Zhang, Y
  • Heidbrink, WW
  • Zhou, S
  • Boehmer, H
  • McWilliams, R
  • Carter, TA
  • Vincena, S
  • Lilley, MK
  • et al.

Published Web Location Commons 'BY' version 4.0 license

The Doppler-shifted cyclotron resonance between fast ions and shear Alfv́n waves (SAWs) has been experimentally investigated with a test-particle fast-ion (Li+) beam launched in the helium plasma of the Large Plasma Device [Gekelman, Rev. Sci. Instrum. 62, 2875 (1991)]. Left- or right-hand circularly polarized SAWs are launched by an antenna with four current channels. A collimated fast-ion energy analyzer characterizes the resonance by measuring the nonclassical spreading of the averaged beam signal. Left-hand circularly polarized SAWs resonate with the fast ions but right-hand circularly polarized SAWs do not. The measured fast-ion profiles are compared with simulations by a Monte Carlo Lorentz code that uses the measured wave field data. © 2009 American Institute of Physics.

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