Abstract
This paper presents the experimental identification of the dynamic interaction between three fluctuations excited by different thermodynamical forces in a linear plasma. The observed fluctuations are characterized as an axial symmetric mode, a drift wave, and an azimuthally symmetric potential fluctuation from the spatiotemporal structures measured with Langmuir probe arrays. The intermittent burst of the axial symmetric mode is observed by the instantaneous wave number spectrum. The energy transfer analysis revealed that the axially symmetric mode gains energy from the other mode during the burst while the drift wave loses energy. The intermittent burst synchronizes with the azimuthal symmetric potential fluctuation.
Highlights
In magnetically confined plasmas, several types of fluctuations can be linearly excited by different free energy sources and will saturate via transport and nonlinear interactions between them
This paper reports the identification of interactions between a drift wave, an axial symmetric mode, and an azimuthal symmetric potential fluctuation in a linear plasma
Different types of fluctuations coexist and intermittently interact with each other synchronizing with the low frequency potential fluctuation
Summary
Several types of fluctuations can be linearly excited by different free energy sources and will saturate via transport and nonlinear interactions between them. The observed fluctuations are characterized as an axial symmetric mode, a drift wave, and an azimuthally symmetric potential fluctuation from the spatiotemporal structures measured with Langmuir probe arrays.
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