Experimental evaluation of bulk-ion heating by energetic particle driven instabilities

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On the Large Helical Device, the excitation of energetic particle driven instability, whose toroidal mode number is zero, and the increase in ion temperature being associated with the activity of the instabilities is observed when energetic particle beams are injected to very low density micro-wave sustained plasmas. From a theoretical analysis based on experimental observation, the instability was evaluated to be Geodesic Acoustic Mode (GAM). From the correlation analysis between the activity of the mode and the ion temperature behaviors, it was concluded the anomalous heating of bulk-ions is the most probable mechanism to explain the increase in the ion temperatures.