Phase Diagram of Plasma Turbulence Structures

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We characterized structures of turbulence in magnetized plasma for a wide range of operational parameters of magnetic field and filling gas pressure and made a phase diagram of plasma states in LMD-U at Kyushu University. We observed density fluctuation spectra with a multi-channel probe array. Different types of spectra and bifurcation phenomena were found in the scanned space of filling gas pressure and magnetic field. Furthermore, the dynamics during transitions between bifurcated states were analyzed. We considered the type of spectrum as an index of the specific state of plasma turbulence and quantified the state by amplitude and total bi-coherence of characteristic low frequency modes. This research is one concrete example of an expansion of the phase diagram in a non-equilibrium system.