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β suppression of Alfvén cascade modes in the National Spherical Torus Experiment

  • Author(s): Fredrickson, ED
  • Crocker, NA
  • Gorelenkov, NN
  • Heidbrink, WW
  • Kubota, S
  • Levinton, FM
  • Yuh, H
  • Menard, JE
  • Bell, RE
  • et al.

Published Web Location Commons 'BY' version 4.0 license

Alfvén cascade modes have been found in low density, low β plasmas on the National Spherical Torus Experiment [M. Ono et al., Nucl. Fusion 40, 557 (2000)]. An extension of the theory of cascade modes which includes the coupling to geodesic acoustic modes [Breizman et al., Phys. Plasmas 12, 112506 (2005)] is shown to imply their absence for typical spherical tokamak ratios of electron thermal to magnetic energy, β. A scan in electron β confirmed a threshold for suppression of cascade modes in good agreement with theoretical predictions. © 2007 American Institute of Physics.

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