Active control of Alfvén eigenmodes by external magnetic perturbations with different spatial spectra
J. Gonzalez-Martin,
M. Garcia-Munoz,
J. Galdon-Quiroga
et al.
Abstract:Alfvén eigenmodes have been suppressed and excited in tokamak plasmas by (just) modifying the poloidal spectra of externally applied static magnetic perturbations. This effect is observed experimentally when toroidal spectra of n=2, n=4 as well as a mixed spectrum of n=2 and n=4 is applied. Under the n=2 magnetic perturbations, the modes are excited or suppressed by modifying the coil phasing between the upper and the lower set of coils. 
Regardless of the absolute rotation, an even parity for the n=4 … Show more
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