| OT01 · Nonlinearly Driven Second Harmonics of Alfvén Cascades
H. Smith1, B. N. Breizman2, M. Lisak1, D. Anderson1
1Dept. of Radio and Space Science, Chalmers University of Technology,
SE-41296 Göteborg, Sweden
2Institute for Fusion Studies, The University of Texas at Austin, Texas 78712, USA
Abstract: In recent experiments on Alcator C-Mod, measurements of density fluctuations with Phase Contrast
Imaging through the plasma core show a second harmonic of the basic Alfvén Cascade (AC)
signal. The present work describes the perturbation at the second harmonic as a nonlinear sideband
produced by the Alfvén Cascade eigenmode via quadratic terms in the MHD equations.
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