Fig. 1 | Scientific Reports

Fig. 1

From: Nonlinear excitation of energetic particle driven geodesic acoustic mode by resonance overlap with Alfvén instability in ASDEX Upgrade

Fig. 1

The reproduction of experimental phenomena by simulation. The frequency spectrum of the Alfvén instability and EGAM are shown, where the Alfvén instability is the higher frequency mode and the EGAM is the lower frequency mode. Panel (a) shows the frequency spectrum in the simulation, the color bar represents the velocity perturbation normalized by Alfvén velocity and is plotted on a logarithmic scale. Panel (b) shows the experimental observation in shot #34924 of AUG. The color bar represents the soft X-ray emission power and is plotted on a logarithmic scale. Yellow dashed line and pink dotted line represent the excitation time of Alfvén instability and EGAM.

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