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A flutelike coherent density fluctuation with a frequency near the E × B rotation frequency is observed in the center cell of the GAMMA 10 tandem mirror. It is excited when the ambipolar potential of a plasma is raised owing to electron cyclotron resonance heating. Far-infrared laser scattering is employed and the radial distribution of the fluctuation is obtained. It has a rather broad profile and azimuthal modenumber m =1. The observed characteristics of the mode are consistent with the rotational flute mode.
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Saito et al. (1988) studied this question.
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